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Overview of the Spanning Tree Protocol

7-3

If the link through Bridge C fails, as shown in Figure 7-3, the STP 
system reconfigures the network so that traffic from segment 2 flows 
through Bridge B.

Figure 7-3   

Traffic flowing through Bridge B

How STP Works

STP has the following three stages of operation:

■

Initialization

■

Stabilization

■

Reconfiguration

Initialization

Initially, the STP system requires the following before it can configure 
the network:

■

All bridges exchange information by way of Bridge Protocol Data 
Units (BPDUs), which are transmitted in packets with a known 
multicast address

■

To determine a single root bridge as a result of BPDU exchange

The Root Bridge is selected on the basis of it having the lowest Bridge 
Identifier value. This value is a combination of the unique MAC address 
of the bridge and a priority component defined for the bridge.

SW3800.BK  Page 3  Tuesday, May 5, 1998  5:20 PM

Содержание 3Com SuperStack 3 Switch 3800 Family

Страница 1: ... http www 3com com SuperStack II Switch 3800 User Guide Part No DUA1691 0AAA01 100004 00 Rev 01 Published April 1998 SW3800 BK Page i Tuesday May 5 1998 5 20 PM ...

Страница 2: ...set forth in subparagraph a through d of the Commercial Computer Software Restricted Rights Clause at 48 C F R 52 227 19 and the limitations set forth in 3Com Corporation s standard commercial agreement for the software Unpublished rights reserved under the copyright laws of the United States If there is any software on removable media described in this documentation it is furnished under a licens...

Страница 3: ... different outlet so that equipment and receiver are on different branch circuits If necessary the user should consult the dealer or an experienced radio television technician for additional suggestions The user may find the following booklet prepared by the Federal Communications Commission helpful How to Identify and Resolve Radio TV Interference Problems This booklet is available from the U S G...

Страница 4: ...iv SW3800 BK Page iv Tuesday May 5 1998 5 20 PM ...

Страница 5: ...Port Connections 1 3 Full duplex 1 3 Port Redundancy 1 3 Load Sharing 1 4 Switch Operation 1 4 Virtual LANs VLANs 1 4 Priority Access Control Enabled PACE 1 5 Spanning Tree Protocol STP 1 5 IP Unicast Routing 1 5 Network Configuration Example 1 5 Switch 3800 Front View 1 7 Ports 1 7 LEDs 1 8 Switch 3800 Rear View 1 9 Power Socket 1 9 Serial Number 1 9 MAC Address 1 10 Console Port 1 10 Factory Def...

Страница 6: ... User Access Level 3 1 Administrator Access Level 3 2 Default Accounts 3 2 Adding a Password to the Default admin Account 3 2 Creating a Management Account 3 3 Changing Account Passwords 3 3 Viewing Switch Accounts 3 4 Deleting a Switch Account 3 4 Methods of Managing the Switch 3800 3 4 Using the Console Interface 3 5 Using Telnet 3 5 Configuring Switch IP Parameters 3 5 Using a BOOTP Server 3 5 ...

Страница 7: ...ng Configuration 3 16 Current Limitations of Load Sharing 3 16 SmartRedundancy 3 17 Port Commands 3 17 4 COMMANDS Understanding the Command Syntax 4 1 Syntax Helper 4 2 Command Completion 4 2 Abbreviated Syntax 4 2 Command Shortcuts 4 2 Numerical Ranges 4 3 Names 4 3 Symbols 4 3 Line Editing Commands 4 4 Command History Substitution 4 5 Common Commands 4 5 Switch 3800 Commands 4 6 General Switch C...

Страница 8: ...ches 5 4 Tagged VLANs 5 6 Uses of Tagged VLANs 5 6 Assigning a VLAN Tag 5 6 Mixing Port based and Tagged VLANs 5 8 Protocol based VLANs 5 8 Predefined Protocol Filters 5 9 Defining Protocol Filters 5 10 VLAN Names 5 10 The Default VLAN 5 11 Configuring VLANs on the Switch 3800 5 11 VLAN Configuration Examples 5 12 Displaying VLAN Settings 5 13 Deleting and Resetting VLANs 5 15 6 SWITCH FORWARDING ...

Страница 9: ...7 10 Configuring STP 7 10 Configuration Example 7 12 Displaying STP Settings 7 12 Disabling and Resetting STP 7 14 8 IP UNICAST ROUTING Overview of IP Unicast Routing 8 1 Router Interfaces 8 1 Populating the Routing Table 8 2 Dynamic Routes 8 3 Static Routes 8 3 Multiple Routes 8 3 Configuring IP Unicast Routing 8 4 Verifying the IP Unicast Routing Configuration 8 5 Configuring DHCP BOOTP Relay 8 ...

Страница 10: ...ts of RMON 9 13 Improving Efficiency 9 13 Allowing Proactive Management 9 13 Reducing the Traffic Load 9 13 RMON and the Switch 9 14 RMON Features of the Switch 9 14 About Event Actions 9 15 10 SOFTWARE UPGRADE AND BOOT OPTIONS Upgrading the Software 10 1 Rebooting the Switch 10 2 Saving Configuration Changes 10 2 Returning to Factory Defaults 10 3 Boot Option Commands 10 3 A SAFETY INFORMATION Im...

Страница 11: ...erie A 11 B TECHNICAL SPECIFICATIONS C TROUBLESHOOTING LEDs C 1 Using the Command Line Interface C 2 VLANs C 4 STP C 5 Routing C 6 D TECHNICAL SUPPORT Online Technical Services D 1 World Wide Web Site D 1 3Com Bulletin Board Service D 1 Access by Analog Modem D 1 Access by Digital Modem D 2 3ComFactsSM Automated Fax Service D 2 3ComForum on CompuServe Online Service D 3 Support from Your Network S...

Страница 12: ...xii GLOSSARY INDEX 3COM CORPORATION LIMITED WARRANTY SW3800 BK Page xii Tuesday May 5 1998 5 20 PM ...

Страница 13: ...tworks LANs Ethernet concepts Ethernet switching and bridging concepts Simple Network Management Protocol SNMP IP Routing The Release Notes shipped with the Switch 3800 may contain information that updates or overrides information in this guide You should always follow the information in the Release Notes if it is different from the information given in this guide Terminology Throughout this guide...

Страница 14: ... Switch Forwarding Database FDB Chapter 6 Switch Forwarding Database FDB Configuring Spanning Tree Protocol parameters Chapter 7 Spanning Tree Protocol STP Configuring IP Unicast Routing Chapter 8 IP Unicast Routing Monitoring Chapter 9 Status Monitoring and Statistics Saving the Switch configuration Chapter 10 Software Upgrade and Boot Options Upgrading the Switch software Chapter 10 Software Upg...

Страница 15: ...word enter in this guide you must type something and then press the Return or Enter key Do not press the Return or Enter key when an instruction simply says type Key names Key names appear in text in one of two ways Referred to by their labels such as the Return key or the Escape key Written with brackets such as Return or Esc If you must press two or more keys simultaneously the key names are lin...

Страница 16: ...arguments One or more values or arguments can be specified For example in the syntax disable vlan name all you must specify either the VLAN name for name or the keyword all when entering the command Do not type the square brackets vertical bar Separates mutually exclusive items in a list one of which must be entered For example in the syntax config snmp community read write string you must specify...

Страница 17: ...tes character to the left of cursor and shifts remainder of line to left Delete or Ctrl D Deletes character under cursor and shifts remainder of line to left Ctrl K Deletes characters from under cursor to the end of the line Insert Toggles on and off When toggled on inserts text and pushes previous text to right Left Arrow Moves cursor to left Right Arrow Moves cursor to right Home or Ctrl A Moves...

Страница 18: ...6 ABOUT THIS GUIDE SW3800 BK Page 6 Tuesday May 5 1998 5 20 PM ...

Страница 19: ...s network users Part of the 3Com SuperStack II range of products the Switch 3800 provides switching and IP Routing between multiple 10BASE T 100BASE TX ports and one Gigabit Ethernet port Summary of Features The Switch 3800 has the following features 24 autosensing 10BASE T 100BASE TX ports one Gigabit Ethernet port and one redundant Gigabit Ethernet port Support for 12 000 addresses in the Switch...

Страница 20: ...net Load sharing Spanning Tree Protocol IEEE 802 1d Multiple spanning trees 64 Wire speed Internet Protocol IP via Routing Information Protocol RIP version 1 and RIP version 2 Wire speed Internet Protocol IP unicast routing 3Com s SuperStack II architecture Integrated network management 19 inch rack or free standing mounting Agent support Simple Network Management Protocol SNMP Remote Monitoring R...

Страница 21: ...IX crossover A crossover cable will typically be needed to connect these ports to another 3Com Switch Full duplex The Switch 3800 provides full duplex support for all ports Full duplex allows frames to be transmitted and received simultaneously and in effect doubles the bandwidth available on a link All 10 100 Mbps ports on the Switch 3800 autonegotiate for half or full duplex operation Port Redun...

Страница 22: ...idge for filtering forwarding and learning packets Virtual LANs VLANs The Switch 3800 has a Virtual LAN VLAN feature that allows you to build your network segments without being restricted by physical connections A VLAN is a group of location and topology independent devices that communicate as if they are on the same physical Local Area Network LAN Implementing VLANs on your network has the follo...

Страница 23: ...bled when the main paths are operational Redundant paths are enabled if the main traffic paths fail For more information on STP refer to Chapter 7 IP Unicast Routing The Switch 3800 can route IP traffic between the VLANs configured as virtual router interfaces Both dynamic and static IP routes are maintained in the routing table RIP version 1 and RIP version 2 are supported For more information on...

Страница 24: ...nets on each floor and also provides bridged connectivity for non IP traffic The Gigabit Ethernet port on the Switch 3800 connects into a Gigabit Ethernet campus backbone Using Gigabit Ethernet as a backbone technology removes bottlenecks by providing scalable bandwidth low latency and high speed data switching Switch 3800 To Backbone Ethernet Server Workstation Key Fast Ethernet Gigabit Ethernet ...

Страница 25: ...s The Switch 3800 has 24 autosensing 10BASE T 100BASE TX ports using standard RJ 45 connectors and supports one Gigabit Ethernet port and one redundant Gigabit Ethernet port using standard Gigabit Interface Connectors GBICs You must have a GBIC transceiver module inserted to make use of these ports The Switch 3800 ports support the media types and distances listed in Table 1 1 10 100 Mbps ports Un...

Страница 26: ...ers 500 Meters 550 Meters 1000BASE LX 1300 nm 62 5 125 um Multimode fiber 50 125 um Multimode fiber 50 125 um Multimode 10u Single mode fiber 500 400 500 NA 550 Meters 550 Meters 550 Meters 5 000 Meters Table 1 2 Switch 3800 LEDs LED Color Indicates 10 100Mbps Port Status LEDs Green Yellow Green flashing Off Link is present port is enabled Frames are being transmitted received on this port Link is...

Страница 27: ...u may need this serial number for fault reporting purposes Unit Status LEDs Power Green Yellow The Switch 3800 is powered up The Switch 3800 is indicating a power overheat or fan failure MGMT Green Green flashing Yellow The Switch 3800 is operating normally Software download is in progress Power On Self Test POST is in progress The Switch 3800 has failed its POST or is indicating an overheat condi...

Страница 28: ...ht data bits one stop bit no parity XON XOFF flow control enabled SNMP read community string Public SNMP write community string Private RMON history session Enabled RMON alarms Enabled Send trap if load is greater than 75 of available bandwidth Send trap if there are more than 10 errors in 1 000 packets PACE Recognition disabled Virtual LANs One VLAN named default all ports belong to the default V...

Страница 29: ...ted in a standard 19 inch equipment rack Alternatively the device can be rack mounted in a wiring closet or equipment room Two mounting brackets are supplied with the Switch CAUTION When using a rack mounting system the Switch must be mounted on a shelf or runners The rack mounting brackets alone are not sufficient to support the weight of the Switch The rack mounting brackets are provided to ensu...

Страница 30: ...ng on a tabletop Rack Mounting The Switch 3800 is 2U high and will fit in most standard 19 inch racks CAUTION The Switch should only be used in a rack if it is mounted on runners a shelf or a tray to support the weight The rack mount kits alone are not sufficient to support the weight of the Switch The rack mount kits must not be used to suspend the Switch from under a table or desk or attach it t...

Страница 31: ...allation of the Switch into the mounting rack CAUTION When using rack mounting runners a shelf or a tray make sure that the ventilation holes on the side of the Switch are not obstructed 7 Connect cables Free Standing The Switch 3800 is supplied with four self adhesive rubber pads Apply the pads to the underside of the device by sticking a pad in the marked area at each corner of the Switch SW3800...

Страница 32: ...s on top of each other ensuring that the pads of the upper device line up with the recesses of the lower device Connecting Equipment to the Console Port Connection to the console port is used for direct local management The Switch 3800 console port settings are set as follows Baud rate 9600 Data bits 8 Stop bit 1 Parity None Flow control XON XOFF The terminal connected to the console port on the S...

Страница 33: ...uts Screen TxD RxD Ground RTS CTS DSR DCD DTR Cable connector 9 pin female Switch 3800 Cable connector 25 pin male female PC Terminal Screen RxD TxD Ground RTS DTR CTS DSR DCD Shell 3 2 5 7 8 6 1 4 1 3 2 7 4 20 5 6 8 Screen DTR TxD RxD CTS Ground DSR RTS DCD Cable connector 9 pin female Switch 3800 Cable connector 9 pin female PC AT Serial Port Screen DCD RxD TxD DTR Ground DSR RTS CTS Shell 4 3 2...

Страница 34: ...ght Logging on for the First Time After the Switch has completed the POST it is operational Once operational you can log on to the Switch and configure an IP address for the default VLAN named default To manually configure the IP settings perform the following steps 1 Connect a terminal or workstation running terminal emulation software to the console port 2 At your terminal press Return until you...

Страница 35: ...g vlan default ipaddress 123 45 67 8 255 255 255 0 Your changes take effect immediately 6 Save your configuration changes so that they will be in effect after the next Switch reboot by typing save For more information on saving configuration changes refer to Chapter 10 7 When you are finished using the facility log out of the Switch by typing logout SW3800 BK Page 7 Tuesday May 5 1998 5 20 PM ...

Страница 36: ...2 8 CHAPTER 2 INSTALLATION AND SETUP SW3800 BK Page 8 Tuesday May 5 1998 5 20 PM ...

Страница 37: ...rmation on the SAVE command refer to Chapter 10 Security Access Levels The Switch 3800 supports two security access levels User Administrator User Access Level A user level account can view all manageable parameters with the following exceptions User account information SNMP community strings A user level account can use the ping command to test device connectivity A user level account can also ch...

Страница 38: ...with two accounts as shown in Table 3 1 The default accounts do not have passwords assigned to them Passwords must have a minimum of 4 characters and can have a maximum of 12 characters Adding a Password to the Default admin Account To add a password to the default admin account follow these steps 1 Logon to the Switch using the name admin 2 At the password prompt press Return 3 Add a default admi...

Страница 39: ...assword prompt press Return 3 Add a new user by typing the following create account admin user username 4 Enter the password at the prompt 5 Re enter the password at the prompt 6 Save your changes by typing save Changing Account Passwords To add a password to a user account follow these steps 1 At the logon prompt enter your user name and password Note that they are both case sensitive Ensure that...

Страница 40: ...Session admin R W 0 0 user RO 0 0 Deleting a Switch Account To delete a switch account you must have administrator privileges Use the following command to delete an account delete account username Methods of Managing the Switch 3800 You can manage the Switch 3800 using the following methods Access the command line interface by connecting a terminal or workstation with terminal emulation software t...

Страница 41: ...lt To open the Telnet session you must specify the IP address of the device that you want to manage Check the user manual supplied with the Telnet client you are using if you are unsure of how to do this Once the connection is established you will see the system prompt and you may log on Configuring Switch IP Parameters In order to manage the Switch by way of a Telnet connection or by using an SNM...

Страница 42: ... IP addresses For information on creating and configuring VLANs refer to Chapter 5 Virtual LANs VLANs To manually configure the IP settings perform the following steps 1 Connect a terminal or workstation running terminal emulation software to the console port 2 At your terminal press Return one or more times until you see the logon prompt 3 At the logon prompt enter your user name and password Not...

Страница 43: ... 0 1 1 7 Save your configuration changes so that they will be in effect after the next Switch reboot by typing save For more information on saving configuration changes refer to Chapter 10 8 When you have finished using the facility log out of the Switch by typing logout Disconnecting a Telnet Session For security purposes an administrator access level account can disconnect a management session t...

Страница 44: ...gged on as an administrator to enable or disable Telnet Using SNMP Any Network Manager running the Simple Network Management Protocol SNMP can manage the Switch provided the Management Information Base MIB is installed correctly on the management station Each Network Manager provides its own user interface to the management facilities 3Com s Transcend range of Network Managers all have facilities ...

Страница 45: ... Traps A trap is a message sent by an SNMP agent to an authorized trap receiver usually a network management station to indicate the occurrence of a significant event such as an error condition or a threshold that has been reached The Switch 3800 supports the traps listed in Table 3 3 Table 3 2 Supported MIBs Description RFC Number MIB II 1213 Bridge MIB 1493 RMON 1757 RMON II Probe Configuration ...

Страница 46: ...tem contact optional The system contact is a text field that allows you to enter the name of the person s responsible for managing the Switch System name The system name is the name that you have assigned to this Switch The default name is 3C16910 System location optional Using the system location field you can enter a location for this Switch Falling alarm Indicates that an RMON alarm entry has c...

Страница 47: ...and write community strings The community string can have a maximum of 32 characters config snmp delete ipaddress all Allows you to delete the IP address of a specified SNMP management station or all SNMP management stations config snmp delete trapreceiver ip_address all Allows you to delete the IP address of a specified trap receiver or all authorized trap receivers If you delete all trap receive...

Страница 48: ...itch 3800 has the following two facilities for checking basic connectivity ping traceroute Ping The ping command allows you to send Internet Control Message Protocol ICMP echo messages to a remote IP device The ping command is available for both the user and administrator privilege level The ping command syntax is as follows ping continuous size n ip_address Table 3 5 SNMP Reset and Disable Comman...

Страница 49: ... individual ports Configuring autonegotiation Creating load sharing groups on multiple ports Enabling and Disabling Ports By default all ports are enabled To enable or disable one or more ports use the following command enable disable port portlist For example to disable ports 3 5 and 6 enter the following disable port 3 5 6 Even though a port is disabled the link remains enabled for diagnostic pu...

Страница 50: ...ability issue exists 10 100 port settings Fast Ethernet ports can connect to either 10BASE T or 100BASE TX networks By default the ports autonegotiate port speed and duplex settings You can manually determine these settings by turning autonegotiation off and providing speed and duplex settings To configure port speed and duplex settings on 10 100 Mbps ports use the following command config port po...

Страница 51: ...r example traffic transmitted to a 2 port load sharing group should originate from a minimum of two other ports on the same Switch This feature is supported between Switch 3800 Switches only but may be compatible with third party trunking or sharing algorithms Configuring Load Sharing To set up the Switch 3800 to load share among ports you must create a load sharing group of ports Load sharing gro...

Страница 52: ...ve those ports deleted from the VLAN when load sharing becomes enabled Verifying the Load Sharing Configuration The show port config output screen shows all of the ports that are involved in load sharing and the associated master port Current Limitations of Load Sharing The following describes implementation restrictions that currently apply to load sharing The load sharing group must not particip...

Страница 53: ...iguration of a group of 10 100 Mbps ports Specify the following auto off The port will not autonegotiate the settings speed The speed of the port for 10 100 Mbps ports only duplex The duplex setting half or full duplex config port portlist auto off duplex full Allows you to disable autonegotiation on a Gigabit port enable port portlist Allows you to enable one or more ports enable sharing master_p...

Страница 54: ... layer configuration and statistics show port portlist errors Displays error information for one or more ports show port portlist collisions Displays real time collision statistics show port portlist packet Displays a histogram of packet statistics for one or more ports show port portlist util Displays port utilization by percentage bytes per second or packets per second Use the space bar to toggl...

Страница 55: ...tained through a Switch power cycle or reboot you must issue a SAVE command after you have made the change For more information on the SAVE command refer to Chapter 10 Understanding the Command Syntax This section describes the steps to take when entering a command Refer to the sections that follow for detailed information on using the command line interface To use the command line interface follo...

Страница 56: ...ed an incorrect command Command Completion The Switch provides command completion by way of the Tab key If you enter a partial command pressing the Tab key fills in the remainder of the command If command options exist they are displayed The full command is then redisplayed and the cursor is placed at the end of the command Abbreviated Syntax Abbreviated syntax is the shortest unambiguous allowabl...

Страница 57: ...art of the command syntax These symbols explain how to enter the command and you do not type them as part of the command itself Table 4 1 summarizes command syntax symbols Table 4 1 Command Syntax Symbols Symbol Description angled brackets Enclose a variable or value You must specify the variable or value For example in the syntax config vlan name ipaddress ip_address you must supply a VLAN name f...

Страница 58: ...tax Symbols continued Symbol Description Table 4 2 Line Editing Commands Command Description Backspace Deletes character to the left of cursor and shifts remainder of line to left Delete or Ctrl D Deletes character under cursor and shifts remainder of line to left Ctrl K Deletes characters from under cursor to the end of the line Insert Toggles on and off When toggled on inserts text and pushes pr...

Страница 59: ...s you to configure the system date and time The format for time is mm dd yyyy hh mm The time uses a 24 hour clock format config vlan name ipaddress ip_address mask Allows you to configure an IP address and subnet mask for a VLAN enable bootp vlan name all Allows you to enable BOOTP for one or more VLANs For more information on using BOOTP refer to Chapter 3 clear session number Allows you to termi...

Страница 60: ...mmands PACE commands STP commands Basic IP commands IP Address Resolution Protocol ARP commands IP route table commands ICMP commands RIP commands Logging commands Configuration and image commands unconfig switch all Allows you to reset all Switch parameters with the exception of defined VLANs and IP addresses to the factory defaults If you specify the keyword all the IP addresses are reset as wel...

Страница 61: ...uration date time size version Scheduled reboot information System serial number and reworks indicator Software platform System ID Power supply and fan status show version Displays the hardware and software versions currently running on the Switch Also displays the Switch serial number show memory Displays summary system configuration and memory utilization statistics for the CPU system DRAM reboo...

Страница 62: ...sages to a remote IP device Specify continuous ICMP echo messages should be sent continuously size n The size of the packet traceroute ipaddress Allows you to trace the routed path between the Switch and a destination endstation clear counters Allows you to clear all statistical counters for the Switch and ports Table 4 4 General Switch Commands continued Command Description Table 4 5 User Account...

Страница 63: ...able snmp access Allows you to use SNMP to manage the Switch disable snmp access Allows you to disable SNMP on the Switch enable snmp trap Allows you to turn on SNMP trap support disable snmp trap Allows you to prevent SNMP traps from being sent from the Switch config snmp add ipaddress Allows you to add the IP address of an SNMP management station to the access list Up to six addresses can be spe...

Страница 64: ...bership list IP address tag information create vlan name Allows you to create a named VLAN delete vlan name Allows you to remove a VLAN config vlan name add delete portlist tagged untagged Allows you to add and delete ports You can specify tagged and untagged port s By default ports are untagged config vlan name tag vlanid Allows you to assign a numerical VLANid The valid range is from 1 to 4095 c...

Страница 65: ...l_type hex_value Allows you to configure a protocol filter Supported protocol types include EtherType LLC SNAP Table 4 9 FDB Commands Command Description show fdb all mac_address vlan name portlist permanent Displays the forwarding database contents including MAC address associated VLAN port age of entry configuration method and status Providing one of the options acts as a filter on the display P...

Страница 66: ...e aged out Table 4 9 FDB Commands continued Command Description Table 4 10 Port Commands Command Description show port portlist config Displays state link status speed and autonegotiation setting for each port show port portlist stats Displays port information including physical layer configuration and statistics show port portlist errors Displays error information for one or more ports show port ...

Страница 67: ...to the master port enable smartredundancy portlist Allows you to enable the SmartRedundancy feature on the redundant Gigabit Ethernet port When the SmartRedundancy feature is enabled the Switch always uses the primary link when the primary link is available The default setting is enabled disable port portlist Allows you to disable one or more ports disable sharing master_port Allows you to disable...

Страница 68: ...nfig stpd stpd_name hellotime value Allows you to specify the time delay in seconds between the transmission of BPDUs from this STPD when it is the Root Bridge The range is 1 through 10 The default setting is 2 seconds config stpd stpd_name forwarddelay value Allows you to specify the time in seconds that the ports on this STPD spend in the listening and learning states when the Switch is the Root...

Страница 69: ...re STPDs The default setting is disabled disable stpd stpd_name all Allows you to disable the STP mechanism on a particular STPD or for all STPDs enable stpd port portlist Allows you to enable the STP protocol on one or more ports If the STPD is enabled for a port BPDUs will be generated on that port if STP is enabled for the associated STPD The default setting is enabled disable stpd port portlis...

Страница 70: ... specified then all the configured IP interfaces are affected If no optional argument is provided the all is assumed Other IP configuration is not affected When new IP interfaces are added the interface is configured to have ipforwarding disabled by default disable ipforwarding vlan name all Allows you to disable IP forwarding on one or all IP interfaces enable ipforwarding broadcast vlan name all...

Страница 71: ...Basic IP Commands continued Command Description Table 4 14 IP ARP Commands Command Description show iparp ipaddress vlan name all permanent Displays the current Address Resolution Protocol ARP cache for a selected IP address VLAN or all entries With no options information for all VLANs is displayed Information displayed includes IP address MAC address aging timer value VLAN name VLANid and port nu...

Страница 72: ... mask gateway Allows you to delete a static address from the routing table config iproute add blackhole ipaddress mask Allows you to add a blackhole address to the routing table All traffic destined for the configured IP address is dropped and no Internet Control Message Protocol ICMP message is generated config iproute delete blackhole ipaddress mask Allows you to delete a blackhole address from ...

Страница 73: ...erval maxinterval lifetime preference Allows you to configure the router advertisement message timers using seconds Specify mininterval The minimum amount of time between router advertisements The default setting is 450 seconds maxinterval The maximum time between router advertisements The default setting is 600 seconds lifetime The default setting is 1 800 seconds preference The preference level ...

Страница 74: ...ace the parameters are not reset to their defaults enable rip aggregation Allows you to enable RIP aggregation of subnet information on a RIP version 2 interface The default setting is enabled disable rip aggregation Allows you to disable the RIP aggregation of subnet information on a RIP version 2 interface enable rip splithorizon Allows you to enable the split horizon algorithm for RIP Default s...

Страница 75: ...ace v1only Transmit RIP version 1 format packets to the broadcast address v1comp Transmit version 2 format packets to the broadcast address v2only Transmit version 2 format packets to the RIP multicast address If no VLAN is specified the setting is applied to all VLANs The default setting is v2only config rip rxmode none v1only v2only any vlan name all Allows you to change the RIP receive mode for...

Страница 76: ...r are displayed subsystem Filters the log to display messages associated with the selected Switch subsystem Subsystems include Syst STP Brdg SNMP Telnet VLAN and Port If not specified all subsystems are displayed clear log Allows you to clear the log config log display priority subsystem Allows you to configure the real time log display Options include priority Filters the log to display message w...

Страница 77: ...le syslog Allows you to enable logging to a remote syslog host disable log display Allows you to disable the log display disable syslog Allows you to disable logging to a remote syslog host Table 4 18 Logging Commands continued Command Description Table 4 19 Configuration and Image Commands Command Description save config primary secondary Allows you to save the current configuration of the Switch...

Страница 78: ...pecify the IP address of the TFTP server and the image filename You can optionally specify if you want the file downloaded to the primary or secondary image If you do not specify the file is downloaded to the primary image Table 4 19 Configuration and Image Commands continued Command Description SW3800 BK Page 24 Tuesday May 5 1998 5 20 PM ...

Страница 79: ... are not restricted by the hardware that physically connects them The segments are defined by flexible user groups that you create with the command line interface Benefits Implementing VLANs on your networks has the following advantages It eases the change and movement of devices With traditional networks network administrators spend much of their time dealing with moves and changes If users move ...

Страница 80: ...ecurity Devices within each VLAN can only communicate with member devices in the same VLAN If a device in VLAN Marketing must communicate with devices in VLAN Sales the traffic must cross a routing device Types of VLANs Switch 3800 VLANs can be created according to the following criteria Physical port IEEE 802 1Q tag Ethernet protocol type A combination of these criteria Port Based VLANs In a port...

Страница 81: ...inance Figure 5 1 Example of a port based VLAN Even though they are physically connected to the same Switch in order for the members of the different VLANs to communicate the traffic must go through the IP routing functionality provided in the Switch 3800 This means that each VLAN must be configured as a router interface with a unique IP address Sales Marketing Finance SW3800 BK Page 3 Tuesday May...

Страница 82: ...ans two Switches All ports on both Switches belong to VLAN Sales The two Switches are connected using port 12 on Switch 1 and port 18 on Switch 2 Figure 5 2 Single port based VLAN spanning two Switches In a port based VLAN to create multiple VLANs that span two Switches a port on Switch 1 must be cabled to a port on Switch 2 for each VLAN that you want to create At least one port on each Switch mu...

Страница 83: ...eering spans Switch 1 and Switch 2 by way of a connection between Switch 1 port 19 and Switch 2 port 20 Figure 5 3 Two port based VLANs spanning two Switches Using these steps you can create multiple VLANs that span multiple Switches in a daisy chained fashion Each Switch must have a dedicated port for each VLAN Each dedicated port must be connected to a port that is a member of its VLAN on the ne...

Страница 84: ...tiple VLANs This is particularly useful if you have a device such as a server that must belong to multiple VLANs The device must have a NIC that supports 802 1Q tagging A single port can be a member of only one port based VLAN All additional VLAN membership for the port must be done using tags In addition to configuring the VLAN tag for the port the server must have a Network Interface Card NIC th...

Страница 85: ...am of the same network Figure 5 5 Logical view of tagged and untagged traffic Switch 1 Switch 2 Marketing Sales M S Tagged port 802 1Q Tagged server M M M M M M S S S S S S Tagged Ports Sales Switch 1 Port 4 Port 9 Port 17 Switch 1 Port 1 Port 25 Switch 2 Port 7 Port 11 Port 20 Switch 2 Port 25 Marketing Switch 1 Port 8 Port 12 Port 21 Switch 2 Port 5 Port 10 Port 18 SW3800 BK Page 7 Tuesday May 5...

Страница 86: ...ic is always untagged and occurs on all ports when Spanning Tree is enabled For the purposes of VLAN classification packets arriving on a port with an 802 1Q tag containing a vlanid of 0 are treated as untagged Mixing Port based and Tagged VLANs You can configure the Switch 3800 using a combination of port based and tagged VLANs A given port can be a member of multiple VLANs with the stipulation t...

Страница 87: ...l respectively The remainder of the traffic belongs to the VLAN named MyCompany All ports are members of the VLAN MyCompany Figure 5 6 Protocol based VLANs Predefined Protocol Filters The following protocol filters are predefined on the Switch 3800 IP IPX NetBIOS DECNet IP traffic All other traffic 1 Finance Personnel My Company 192 207 36 0 192 207 35 0 192 207 36 1 192 207 35 1 2 3 4 SW3800 BK P...

Страница 88: ...ix protocol filters can be defined VLAN Names The Switch 3800 supports up to 64 different VLANs Each VLAN is given a name that can be up to 32 characters VLAN names can use standard alpha numeric characters The following characters are not permitted in a VLAN name Space Comma Quotation mark VLAN names must begin with an alphabetical letter unless quotation marks are used to enclose a VLAN name tha...

Страница 89: ...d Configuring VLANs on the Switch 3800 This section describes the commands associated with setting up VLANs on the Switch 3800 Configuring a VLAN involves the following steps 1 Create and name the VLAN 2 Assign an IP address and subnet mask if applicable to the VLAN if needed 3 Assign a VLANid if any ports in this VLAN will use a tag 4 Assign one or more ports to the VLAN As you add each port to t...

Страница 90: ...r Supported protocol types include EtherType LLC SNAP config vlan name ipaddress ipaddress mask Allows you to assign an IP address and an optional mask to the VLAN config vlan name add delete port portlist tagged untagged Allows you to add and delete ports within the VLAN You can specify tagged and untagged port s By default ports are untagged config vlan name protocol protocol_name any Allows you...

Страница 91: ... config sales add port 4 7 The following example creates a protocol based VLAN named IPSales Ports 6 through 8 are assigned to the VLAN create vlan ipsales config ipsales protocol ip config ipsales add port 6 8 The following example defines a protocol filter myprotocol for the purposes of later applying to a VLAN This is an example only and has no real world application create protocol myprotocol ...

Страница 92: ...unning spanning tree protocol Protocol Match all unfiltered protocols Ports 23 Number of active port 1 Untag 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 VLAN green created by user Tagging 802 1Q Tag 11 IP Not configured STPD Domain s0 is not running spanning tree protocol Protocol Match all unfiltered protocols Ports 3 Number of active port 0 Untag 1 2 Tagged 7 To display protoco...

Страница 93: ...the following Protocol name List of protocol fields VLANs that use the protocol Deleting and Resetting VLANs To delete a VLAN or to return VLAN settings to their defaults use the commands listed in Table 5 2 Table 5 2 VLAN Delete and Reset Commands Command Description delete vlan name Allows you to remove a VLAN delete protocol protocol Allows you to remove a protocol unconfig vlan name ipaddress ...

Страница 94: ...5 16 CHAPTER 5 VIRTUAL LANS VLANS SW3800 BK Page 16 Tuesday May 5 1998 5 20 PM ...

Страница 95: ...ntry Types The following are three types of entries in the FDB Dynamic entries Initially all entries in the database are dynamic Entries in the database are removed aged out if after a period of time ageing time the Switch has not received a frame containing that source address This prevents the database from becoming full with obsolete entries by ensuring that when a device is removed from the ne...

Страница 96: ...itch 3800 can be configured to recognize PACE modified addresses When present the Switch assigns PACE traffic to the high priority queue within the Switch Recognition of PACE traffic is controlled by the following commands enable pace disable pace How FDB Entries are Added Entries are added into the FDB in two ways The Switch can learn entries That is the Switch updates its FDB with the source MAC...

Страница 97: ...try for a particular MAC address vlan name displays the entries for a VLAN Table 6 1 FDB Configuration Commands Command Description create fdbentry mac_address vlan name portlist Allows you to create a permanent FDB entry Specify the following mac_address Device MAC address using colon separated bytes name VLAN associated with MAC address portlist Port number associated with MAC address If more th...

Страница 98: ... Static 4 Perm 0 Dyn 0 Dropped 0 FDB Aging time 300 The show command displays summary information including MAC address VLAN name and VLANid Entry method dynamic static permanent Port Removing FDB Entries You can remove one or more specific entries from the FDB or you can clear the entire FDB of all entries by using the commands listed in Table 6 2 Table 6 2 Removing FDB Entry Commands Command Des...

Страница 99: ...dge based mechanism for providing fault tolerance on networks STP allows you to implement parallel paths for network traffic and ensure that Redundant paths are disabled when the main paths are operational Redundant paths are enabled if the main path fails CAUTION You should not configure any STP parameters unless you have considerable knowledge and experience with STP The default STP parameters a...

Страница 100: ... configuration because STP detects duplicate paths and immediately prevents or blocks one of them from forwarding traffic Figure 7 2 shows an example of enabling STP on the bridges in the configuration The STP system has decided that traffic from LAN segment 2 to LAN segment 1 can only flow through Bridges C and A Figure 7 2 Traffic flowing through Bridges C and A SW3800 BK Page 2 Tuesday May 5 19...

Страница 101: ...nitialization Initially the STP system requires the following before it can configure the network All bridges exchange information by way of Bridge Protocol Data Units BPDUs which are transmitted in packets with a known multicast address To determine a single root bridge as a result of BPDU exchange The Root Bridge is selected on the basis of it having the lowest Bridge Identifier value This value...

Страница 102: ...segment going down the STP system reconfigures the network to adjust for the changes If the topology of the network changes the Root Bridge sends out an SNMP trap Spanning Tree Domains The Switch 3800 can be partitioned into multiple virtual bridges Each virtual bridge can run an independent spanning tree instance Each spanning tree instance is called a Spanning Tree Domain STPD Each STPD has its ...

Страница 103: ... see each other in the same broadcast domain This could happen if for example another external bridge is used to connect VLANs belonging to separate STPDs Defaults The default device configuration contains a single STPD called s0 The default VLAN is a member of STPD s0 All STP parameters default to the IEEE 802 1D values as appropriate SW3800 BK Page 5 Tuesday May 5 1998 5 20 PM ...

Страница 104: ...anufacturing is defined on Switch Y Switch Z and Switch M Engineering is defined on Switch Y Switch Z and Switch M Marketing is defined on all Switches Switch A Switch B Switch Y Switch Z and Switch M Two STPDs are defined STPD1 contains VLANs Sales and Personnel STPD2 contains VLANs Manufacturing and Engineering The VLAN Marketing is not assigned to a STPD Figure 7 4 Multiple Spanning Tree Domain...

Страница 105: ...Switch B is put into blocking state and the connection between Switch Y and Switch Z is put into blocking state After STP converges all the VLANs can communicate and all bridging loops are prevented The VLAN Marketing which has not been assigned to any STPD communicates using all five Switches The topology has no loops because STP has already blocked the port connection between Switch A and Switch...

Страница 106: ...AN Marketing VLAN Engineering and VLAN Sales The tagged trunk connections for three Switches form a triangular loop that is not permitted in an STP topology All VLANs in each switch are members of the same STPD Figure 7 5 Tag based STP configuration STP may block traffic between Switch 1 and Switch 3 by disabling the trunk ports for that connection on each Switch Switch 2 has no ports assigned to ...

Страница 107: ...ANs only VLAN Engineering is correctly configured so that all ports in that VLAN can communicate with each other Creating STP Domains To create one or more STP domains on your Switch use the following command at the administrator prompt create stpd stpd_name STPD and VLAN profile names must all be unique For example a name given to identify a VLAN cannot be used when you create an STPD To add one ...

Страница 108: ... you have considerable knowledge and experience with STP The default STP parameters are adequate for most networks Table 7 1 shows the commands used to configure STP Table 7 1 STP Configuration Commands Command Description create stpd stpd_name Allows you to create an STPD When created an STPD has the following default parameters Bridge priority 32 768 Hello time 2 seconds Forward delay 15 seconds...

Страница 109: ... Time 1 and less than or equal to 2 x Forward Delay 1 config stpd stpd_name priority value Allows you to specify the priority of the STPD By changing the priority of the Switch you can make it more or less likely to become the Root Bridge The range is 0 65 535 The default setting is 32 768 A setting of 0 indicates the highest priority config stpd stpd_name port cost value portlist Allows you to sp...

Страница 110: ...ample output from the command is displayed below show stpd Stpd s0 Stp DISABLED Number of Ports 8 Ports 1 2 3 4 5 6 7 8 Vlans Default BridgeID 80 00 00 e0 2b 00 a4 00 Designated root 00 00 00 00 00 00 00 00 RootPathCost 0 MaxAge 0s HelloTime 0s ForwardDelay 0s CfgBrMaxAge 20s CfgBrHelloTime 2s CfgBrForwardDelay 15s Topology Change Time 35s Hold time 1s Topology Change Detected FALSE Topology Chang...

Страница 111: ...rity 128 Designated Root 80 00 08 00 4e 2c 13 00Designated Cost 0 Designated Bridge 80 00 08 00 4e 2c 13 00 Designated Port Id 8007 Stpd s0 Port 6 PortId 8006 Stp ENABLED Path Cost 4 Port State BLOCKING Topology Change Ack FALSE Port Priority 128 Designated Root 80 00 08 00 4e 2c 13 00Designated Cost 0 Designated Bridge 80 00 08 00 4e 2c 13 00 Designated Port Id 8003 Stpd s0 Port 5 PortId 8005 Stp...

Страница 112: ...be deleted Table 7 2 STP Disable and Reset Commands Command Description delete stpd stpd_name Allows you to remove an STPD An STPD can only be removed if all VLANs have been deleted from it disable stpd stpd_name all Allows you to disable the STP mechanism on one or all STPDs disable stpd port portlist Allows you to disable STP on one or more ports unconfig stpd stpd_name all Allows you to restore...

Страница 113: ...rotocol RIP The Switch 3800 dynamically builds and maintains a routing table and determines the best path for each of its routes Each host using the IP unicast routing functionality of the Switch 3800 must have a unique IP address assigned In addition the default gateway assigned to the host must be the IP address of the Switch 3800 router interface Router Interfaces The routing software and hardw...

Страница 114: ...s is routed using the IP addresses Figure 8 1 Routing between VLANs Populating the Routing Table The Switch 3800 maintains an IP routing table for both network routes and host routes The table is populated from the following sources Dynamically by way of RIP packets or ICMP redirects exchanged with other routers Statically by way of routes entered by the administrator Default routes configured by ...

Страница 115: ... security reasons to control which routes you want advertised by the router You can decide if you want all static routes to be advertised by using the following command enable disable rip exportstatic The default setting is enabled Static routes are never aged out of the routing table Multiple Routes When there are multiple conflicting choices of a route to a particular destination the router pick...

Страница 116: ...g an IP address using the following command config vlan name ipaddress ipaddress mask Ensure that each VLAN has a unique IP address Configure a default route using the following command config iproute add default gateway metric Default routes are used when the router has no other dynamic or static route to the requested destination Turn on IP routing for one or more VLANs using the following comma...

Страница 117: ...ubnets being serviced by the Switch 3800 and going to hosts on different subnets This feature can be used in various applications including DHCP services between Windows NT servers and clients running Windows 95 To configure the relay function do the following 1 Configure VLANs and IP unicast routing 2 Enable the DHCP or BOOTP relay function using the following command enable bootprelay 3 Configur...

Страница 118: ...dcast forwarding for all VLANs To enable ipforwarding must be enabled on the VLAN The default setting is enabled config bootprelay add ipaddress Adds the IP destination address to forward BOOTP packets config bootprelay delete ipaddress all Removes one or all IP destination addresses for forwarding BOOTP packets config iparp add ipaddress mac_address Adds a permanent entry to the ARP table Specify...

Страница 119: ...nd no Internet Control Message Protocol ICMP message is generated config iproute delete blackhole ipaddress mask Deletes a blackhole address from the routing table config iproute add default gateway metric Adds a default gateway to the routing table A default gateway must be located on a configured IP interface If no metric is specified the default metric of 1 is used config iproute delete default...

Страница 120: ...all Changes the RIP receive mode for one or more VLANs Specify none Drop all received RIP packets v1only Accept only RIP version 1 format packets v2only Accept only RIP version 2 format packets any Accept both version 1 and version 2 packets If no VLAN is specified the setting is applied to all VLANs The default setting is any config rip txmode none v1only v1comp v2only vlan name all Changes the R...

Страница 121: ... modification of route table information when an ICMP redirect message is received The default setting is disabled enable irdp vlan name all Enables the generation of ICMP router advertisement messages on one or more VLANs The default setting is enabled config irdp multicast broadcast Configures the destination address of the router advertisement messages The default setting is broadcast config ir...

Страница 122: ... IP traffic is filtered by the protocol sensitive VLANs All other traffic is directed to the VLAN MyCompany unconfig irdp Resets all router advertisement settings to the default values disable icmp redirects vlan name all Disables the generation of ICMP redirects on one or more VLANs disable icmp unreachables Disables the generation of ICMP unreachable messages on one or more VLANs disable icmp us...

Страница 123: ...e 8 2 is configured as follows create vlan Finance create vlan Personnel create vlan MyCompany config Finance protocol ip config Personnel protocol ip config Finance add port 1 3 config Personnel add port 2 4 config MyCompany add port all config Finance ipaddress 192 207 35 1 config Personnel ipaddress 192 207 36 1 enable ipforwarding enable rip IP NetBIOS IP NetBIOS IP NetBIOS IP NetBIOS IP traff...

Страница 124: ... Resolution Protocol ARP table You can filter the display by IP address VLAN or permanent entries Each entry displayed includes the following IP address MAC address Aging timer value VLAN name VLANid and port number Flags show ipfdb ipaddress netmask vlan name all Displays the contents of the IP forwarding database table Used for technical support purposes show iproute vlan name all permanent ipad...

Страница 125: ...ipaddress netmask vlan name all Removes the dynamic entries in the IP forwarding database disable bootp vlan name all Disables the generation and processing of BOOTP packets disable bootprelay Disables the forwarding of BOOTP requests disable icmp redirects vlan name all Disables the generation of ICMP redirects on one or more VLANs disable icmp unreachables Disables the generation of ICMP unreach...

Страница 126: ... RIP version 2 interface disable rip splithorizon Disables split horizon disable rip poisonreverse Disables poison reverse disable rip triggerupdate Disables triggered updates disable rip exportstatic Disables the filtering of static routes unconfig icmp Resets all ICMP settings to the default values unconfig irdp Resets all router advertisement settings to the default values unconfig rip vlan nam...

Страница 127: ...ng commands available on the Switch Table 9 1 Switch Monitoring Commands Command Description show account Displays the account names access level number of successful and failed logon attempts and the number of active sessions in the user database This command is available only to admin level users show config Displays the current Switch configuration to the terminal You can then capture the outpu...

Страница 128: ...ity subsystem Displays the current snapshot of the log Options include priority Filters the log to display messages with the selected priority or higher more critical Priorities include critical warning and informational If not specified informational priority messages and higher are displayed subsystem Filters the log to display messages associated with the selected Switch subsystem Subsystems in...

Страница 129: ...he list of VLANs that use this protocol show rip vlan name all Displays RIP configuration and statistics for one or more VLANs Display includes the state for RIP settings and interface states Statistics include the following Packets transmitted Packets received Bad packets received Bad routes received Number of RIP peers Peer information show rip stat vlan name all Displays RIP specific statistics...

Страница 130: ...rating environment temperature fans and power supply status NVRAM image information primary secondary image date time size version NVRAM configuration information primary secondary configuration date time size version Scheduled reboot information 802 1p and PACE configuration information System serial number and hardware rework indicators Software platform System identifier show version Displays t...

Страница 131: ...evice connected to the port participated in any of the collisions This value will always be zero for a full duplex device Received Packet Count Rx Pkt Count The total number of good packets that have been received by the port Received Byte Count RX Byte Count The total number of bytes that were received by the port including bad or lost frames This number includes bytes contained in the Frame Chec...

Страница 132: ... be zero for a full duplex device Transmit Deferred Frames TX Def The total number of frames that were transmitted by the port after the first transmission attempt was deferred by other network traffic Transmit Frames Lost TX Lost The total number of frames that were not completely transmitted by the port Transmit Errored Frames TX Err The total number of frames that were not completely transmitte...

Страница 133: ...time hours minutes and seconds in the form HH MM SS If the event was caused by a user the user name is also provided Fault level Table 9 2 describes the three levels of importance that the Switch can assign to a fault Subsystem The facility refers to the specific functional area of the Switch to which the error refers Table 9 3 describes the subsystems Table 9 2 Fault Levels Assigned by the Switch...

Страница 134: ...nd Port If not specified all subsystems are displayed Real time Display In addition to viewing a snapshot of the Switch log you can configure the Switch to maintain a running real time display of log messages on the console To turn on the log display use the following command enable log display To configure the log display use the following command config log display priority subsystem STP STP inf...

Страница 135: ...g do the following Configure the Syslog host to accept and log messages Enable remote logging by using the following command enable syslog Configure remote logging by using the following command config syslog ipaddress facility priority subsystem Specify ipaddress The IP address of the syslog host facility The syslog facility level for local use Options include local0 through local7 priority Filte...

Страница 136: ...slog ip_address facility priority subsystem Allows you to configure the syslog host address and filter messages sent to the syslog host Options include ipaddress The IP address of the syslog host facility The syslog facility level for local use priority Filters the log to display message with the selected priority or higher more critical Priorities include critical warning and informational If not...

Страница 137: ...ystem Allows you to display the a snapshot of the log Options include priority Filters the log to display messages with the selected priority or higher more critical Priorities include critical warning and informational If not specified informational priority messages and higher are displayed subsystem Filters the log to display messages associated with the selected Switch subsystem Subsystems inc...

Страница 138: ...ps Statistics History Alarms Events This section describes how to use each of these groups to monitor your network Statistics The Statistics group provides traffic and error statistics showing packets bytes broadcasts multicasts and errors on a LAN segment or VLAN Information from the Statistics group can be used to detect changes in traffic and error patterns in critical areas of the network Hist...

Страница 139: ...the load on the network and the management workstation Improving Efficiency Using RMON probes allows you to remain at one workstation and collect information from widely dispersed LAN segments or VLANs This means that the time taken to reach a problem site set up equipment and begin collecting information is largely eliminated Allowing Proactive Management If they are configured correctly RMON pro...

Страница 140: ...utonomous actions such as disabling a port temporarily or permanently if errors on that port exceed a predefined threshold Also since a probe must be able to see all traffic a stand alone probe must be attached to a nonsecure port Implementing RMON in the Switch means that all ports can have security features enabled RMON Features of the Switch Table 9 5 details the RMON support provided by the Sw...

Страница 141: ...e greater the burden on the management resources of the Switch However the forwarding performance of the Switch is not affected About Event Actions You can define up to 50 alarms for the Switch The actions that you can define for each alarm are shown in Table 9 6 Table 9 6 Event Actions Action High Threshold No action Notify only Send Trap Notify and log Send trap Place entry in RMON log SW3800 BK...

Страница 142: ...9 16 CHAPTER 9 STATUS MONITORING AND STATISTICS SW3800 BK Page 16 Tuesday May 5 1998 5 20 PM ...

Страница 143: ...er on the network Downloading a new image involves the following Load the new image onto a TFTP server on your network Download the new image to the Switch 3800 using the following command download image ipaddress filename primary secondary where ipaddress is the IP address of the TFTP server filename is the filename of the new image primary secondary optional indicates the image to which you want...

Страница 144: ...memory are not retained by the Switch when the Switch is rebooted In order to retain the settings and have them be loaded when you reboot the Switch you must save the configuration to non volatile storage The Switch 3800 can store two different configurations a primary and a secondary When you save configuration changes you can select which configuration you want the changes saved to If you do not...

Страница 145: ... server and the image filename You can optionally specify if you want the file downloaded to the primary or secondary image If you do not specify the file is downloaded to the primary image save config primary secondary Allows you to save the current configuration of the Switch to NVRAM You can specify the primary or secondary configuration area If not specified the configuration is saved to the c...

Страница 146: ...10 4 CHAPTER 10 SOFTWARE UPGRADE AND BOOT OPTIONS SW3800 BK Page 4 Tuesday May 5 1998 5 20 PM ...

Страница 147: ...of fire or electric shock install the unit in a temperature and humidity controlled indoor area free of conductive contaminants Power To ensure compliance with international safety standards only use the power adapter that is supplied with the unit Disconnect the power adapter before removing the unit The unit must be earthed grounded The unit must be connected to an earthed grounded outlet to com...

Страница 148: ...d Impédance à la terre United Kingdom only The Switch 3800 is covered by Oftel General Approval NS G12345 J 100003 for indirect connection to a public telecommunications system This can only be acheived using the console port on the unit and an approved modem Power Cord This must be approved for the country where it is used USA and Canada The cord set must be UL approved and CSA certified The mini...

Страница 149: ... holder cover The unit automatically adjusts to the supply voltage The fuse is suitable for both 110V A C and 220 240V A C operation To change the fuse release the fuse holder by gently levering a small screwdriver under the fuse holder catch Only fuses of the same manufacturer rating and type as the original must be used with the unit Close the fuse holder To comply with European safety standards...

Страница 150: ...e are no hazardous compounds used within the battery module The weight of the lithium contained in each coin cell is approximately 0 035 grams Two types of batteries are used interchangeably CR chemistry uses manganese dioxide as the cathode material BR chemistry uses poly carbonmonofluoride as the cathode material The battery in the bq4830 device is encapsulated and not user replaceable L informa...

Страница 151: ... doit se trouver à proximité de l appareil et son accès doit être facile Vous ne pouvez mettre l appareil hors circuit qu en débranchant son cordon électrique au niveau de cette prise L appareil fonctionne à une tension extrêmement basse de sécurité qui est conforme à la norme CEI 950 Ces conditions ne sont maintenues que si l équipement auquel il est raccordé fonctionne dans les mêmes conditions ...

Страница 152: ...cle porte fusibles Ce groupe se règle automatiquement sur la tension d alimentation Ce fusible convient à un fonctionnement sur une tension de 110 V c a ou de 220 240 V c a Pour changer ce fusible libérez le porte fusibles en plaçant doucement la lame d un petit tournevis sous le cran de ce Etats Unis et Canada Le cordon doit avoir reçu l homologation des UL et un certificat de la CSA Le cordon so...

Страница 153: ...émission le laser en utilisant un dispositif d agrandissement tant qu il est sous tension Ne regardez jamais directement le port TX Transmission à fibres optiques et les embouts de câbles à fibres optiques tant qu ils sont sous tension DISPOSITIF LASER DE CLASSE 1 Batterie au lithium Remplacez la batterie au lithium par une batterie identique ou de type équivalent en respectant les recommandations...

Страница 154: ...bq4830 est hermétiquement scellé et ne peut donc pas être remplacé par l utilisateur Wichtige Sicherheitsinformat ionen WARNUNG Warnungen enthalten Anweisungen die zur eigenen Sicherheit unbedingt zu beachten sind Bitte befolgen Sie alle Anweisungen sorgfältig und genau Bitte unbedingt vor dem Einbauen des Switch 3800 Einheit die folgenden Sicherheitsanweisungen durchlesen Die Installation und der...

Страница 155: ...ker unterschiedlich für die jeweiligen Anschlüsse kodiert ist Die Netzkabeldrähte für das Gerät sind anhand des folgenden Schemas anzuschließen Braunen Draht an spannungsführende Leitungsklemme anschließen die mit dem Buchstaben L oder rot gekennzeichnet sein kann Blauen Draht an Neutralleiterklemme anschließen die mit dem Buchstaben N oder schwarz gekennzeichnet sein kann Gelb grünen Draht an Mas...

Страница 156: ...r der gleichen Marke und Art mit dem Gerät verwendet werden Faseroptikanschlüsse Optische Sicherheit Niemals mit einem Vergrößerungsgerät ein Übertragungs LED Laser betrachten während dieses eingeschaltet ist Niemals direkt auf den Faser TX Anschluß und auf die Faserkabelenden schauen während diese eingeschaltet sind LASERGERÄT DER KLASSE 1 Fuse SW3800 BK Page 10 Tuesday May 5 1998 5 20 PM ...

Страница 157: ...hiumbatterien sind kein von der EPA aufgelisteter Sondermüll und können daher in der Regel mit dem normalen Müll entsorgt werden Bei der Entsorgung größerer Mengen ist die örtliche Müllverwaltungsstelle zu Rate zu ziehen Das Batteriemodul enthält keine gefährlichen Verbindungen In jeder Zelle ist ca 0 035 g Lithium enthalten Es werden zwei austauschbare Batterietypen verwendet CR Chemie verwendet ...

Страница 158: ...A 12 APPENDIX A SAFETY INFORMATION SW3800 BK Page 12 Tuesday May 5 1998 5 20 PM ...

Страница 159: ...fety Agency Certifications IEC 950 UL 1950 EN60950 CSA 22 2 No 950 EN60825 1 AC Protection 4A Fast Blow Fuse Electromagnetic Compatibility EN55022 Class B FCC Part 15 Class A ICES 003 Class A VCCI Class 2 EN50082 1 AS NZS 3548 Class B CNS 13438 Class A Heat Dissipation 118W maximum 341 2 BTU hr maximum Power Supply AC Line Frequency 47Hz to 63Hz Input Voltage Options 90VAC to 264VAC auto ranging C...

Страница 160: ... 1D IEEE 802 1Q D10 SNMP SNMP protocol RFC 1157 MIB II RFC 1213 Bridge MIB RFC 1493 VLAN MIB RFC 1573 RMON MIB RFC 1757 Terminal Emulation Telnet RFC 854 Protocols Used for Administration UDP RFC 768 IP RFC 791 ICMP RFC 792 TCP RFC 793 ARP RFC 826 TFTP RFC 783 BOOTP RFC 1271 SW3800 BK Page 2 Tuesday May 5 1998 5 20 PM ...

Страница 161: ... and to the supply outlet Check the unit fuse For information on changing the fuse see Appendix A On powering up the MGMT LED lights yellow The device has failed its Power On Self Test POST and you should contact your supplier for advice A link is connected but the Status LED does not light Check that All connections are secure Cables are free from damage The devices at both ends of the link are p...

Страница 162: ...rol enabled The SNMP Network Manager cannot access the device Check that the device s IP address subnet mask and default router are correctly configured and that the device has been reset Check that the device s IP address is correctly recorded by the SNMP Network Manager refer to the user documentation for the Network Manager Check that the community strings configured for the Switch and network ...

Страница 163: ...he original port is indicated Re examine the connections and cabling There may be a network problem preventing you accessing the device over the network Try accessing the device through the console port Check that the community strings configured for the Switch and the network manager are the same Check that SNMP access was not disabled for the Switch Permanent entries remain in the FDB If you hav...

Страница 164: ... to a VLAN If you attempt to add a port to a VLAN and get an error message similar to the following localhost 7 config vlan marketing add port 1 2 ERROR Protocol conflict You already have a VLAN using untagged traffic on a port Only one VLAN using untagged traffic can be configured on a single physical port VLAN configuration can be verified by using the command show vlan name The solution for thi...

Страница 165: ...ed by the switch is 8100 If the third party device differs from this and cannot be changed you may change the 802 1Q Ethertype used by the switch with the command config dot1p ethertype ethertype Changing this parameter will change how the switch recognizes all tagged frames received and the value it inserts in all tagged frames it transmits VLANs IP Addresses and default routes Recall that the sw...

Страница 166: ...ose Switches that do not use redundant paths Specify that the endstation entries are static or permanent Routing The Switch sees RIP updates but other routers don t Ensure that the RIP transmit and receive modes are appropriate for the environment If other routers only use RIP Version 1 ensure the switch is transmitting V1 updates SW3800 BK Page 6 Tuesday May 5 1998 5 20 PM ...

Страница 167: ...ComForum on CompuServe online service World Wide Web Site Access the latest networking information on 3Com Corporation s World Wide Web site by entering our URL into your Internet browser http www 3Com com This service features news and information about 3Com products customer service and support 3Com Corporation s latest news releases NetAge Magazine and more 3Com Bulletin Board Service 3ComBBS c...

Страница 168: ... numbers are available within the following countries Country Data Rate Telephone Number Australia up to 14400 bps 61 2 9955 2073 Brazil up to 14400 bps 55 11 547 9666 France up to 14400 bps 33 1 6986 6954 Germany up to 28800 bps 4989 62732 188 Hong Kong up to 14400 bps 852 2537 5608 Italy fee required up to 14400 bps 39 2 27300680 Japan up to 14400 bps 81 3 3345 7266 Mexico up to 28800 bps 52 5 5...

Страница 169: ...uding network planning installation hardware maintenance application training and support services When you contact your network supplier for assistance have the following information ready Diagnostic error messages A list of system hardware and software including revision levels Details about recent configuration changes if applicable If you are unable to contact your network supplier see the fol...

Страница 170: ...xt 6115 Shanghai 852 2501 1111 91 11 644 3974 62 21 523 9181 82 2 319 4711 60 3 732 7910 65 538 9368 886 2 377 5850 662 231 8151 4 32 725 0202 31 30 6029700 403 265 3266 514 683 3266 613 566 7055 416 498 3266 604 434 3266 33 1 69 86 68 00 43 1 5134323 42 2 21845 800 49 30 3498790 Berlin 49 89 627320 Munich 36 1 250 83 41 48 22 6451351 41 31 996 14 14 3Com Ireland 3Com Japan 3Com Latin America Arge...

Страница 171: ...t RMA numbers will be returned to the sender unopened at the sender s expense To obtain an RMA number call or fax Country Telephone Number Fax Number U S A and Canada 1 800 876 3266 option 2 408 764 7120 Latin America 1 408 326 7801 408 764 7120 Europe South Africa and Middle East 44 1442 438125 44 1442 435822 Outside Europe U S A and Canada 1 408 326 7804 1 408 764 7120 SW3800 BK Page 5 Tuesday M...

Страница 172: ...D 6 APPENDIX D TECHNICAL SUPPORT SW3800 BK Page 6 Tuesday May 5 1998 5 20 PM ...

Страница 173: ...he switching speed of a serial line Also known as line speed BOOTP A protocol that allows automatic mapping of an IP address to a given MAC address each time a device is started In addition the protocol can assign the subnet mask and default gateway to a device bridge A device that interconnects local or remote networks no matter what higher level protocols are involved Bridges form a single logic...

Страница 174: ...frame toward its destination by an internetworking device full duplex A system that allows frames to be transmitted and received simultaneously and in effect doubles the bandwidth available on a link Gigabit Ethernet 1000 Mbps technology based on the Ethernet CD network access method IEEE 802 3Z ICMP Internet Control Message Protocol An integral part of the Internet Protocol IP that handles error ...

Страница 175: ...ddresses are specified in the destination address field of the packet NVRAM Non volatile RAM NVRAM retains its contents when the Switch is powered off PACE Priority Access Control Enabled that is 3Com s innovative technology to work in conjunction with a switch in order to control the latency and jitter associated with the transmission of multimedia traffic over Ethernet and Fast Ethernet POST Pow...

Страница 176: ...puter equipment Telnet A TCP IP application protocol that provides virtual terminal service letting a user log in to another computer system and access a host as if the user were connected directly to the host TFTP Trivial File Transfer Protocol that allows the transfer of files such as software upgrades from a remote device using the Switch s local management capabilities Transcend 3Com s umbrell...

Страница 177: ... 3 7 dynamic entries 6 1 dynamic routes 8 3 E EMC statement ii Events RMON group 9 13 9 14 F factory defaults 1 10 fax service See 3ComFacts FDB configuring 6 3 creating a permanent entry 6 3 displaying 6 3 dynamic entries 6 1 entries 6 1 permanent entries 6 2 removing entries 6 4 static entries 6 1 features 1 1 forward delay configuring 4 14 7 11 Forwarding Database See FDB free standing installa...

Страница 178: ...nting 2 2 rebooting 10 2 Remote Monitoring See RMON reset button 1 10 resetting to factory defaults 10 3 returning products for repair D 5 RIP configuration commands table 8 7 enabling 8 4 RMON alarm actions 9 15 features supported 9 14 groups supported 9 14 probe 9 12 Routing Information Protocol See RIP routing table populating 8 2 routing See IP unicast routing S safety information English A 1 ...

Страница 179: ...t 9 9 T technical support D 1 3Com URL D 1 bulletin board service D 1 fax service D 2 network suppliers D 3 product repair D 5 using CompuServe D 3 Telnet disconnecting a session 3 7 using 3 5 TFTP server 10 1 trunk 5 6 U upgrading software 10 1 URL D 1 users creating 3 3 default 3 2 viewing 3 4 V viewing accounts 3 4 Virtual LANs See VLANs VLAN tagging 5 6 VLANid 5 6 VLANs benefits 5 1 configurat...

Страница 180: ...4 INDEX SW3800 BK Page 4 Tuesday May 5 1998 5 20 PM ...

Страница 181: ... parties that the operation of the software products will be uninterrupted or error free or that all defects in the software products will be corrected For any third party products listed in the 3Com software product documentation or specifications as being compatible 3Com will make reasonable efforts to provide compatibility except where the noncompatibility is caused by a bug or defect in the th...

Страница 182: ...ANCE USE PERFORMANCE FAILURE OR INTERRUPTION OF ITS PRODUCTS EVEN IF 3COM OR ITS AUTHORIZED RESELLER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES AND LIMITS ITS LIABILITY TO REPAIR REPLACEMENT OR REFUND OF THE PURCHASE PRICE PAID AT 3COM S OPTION THIS DISCLAIMER OF LIABILITY FOR DAMAGES WILL NOT BE AFFECTED IF ANY REMEDY PROVIDED HEREIN SHALL FAIL OF ITS ESSENTIAL PURPOSE Some countries sta...

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