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Overview of the Spanning Tree Protocol

If the link through Bridge C fails, as shown in

Figure 15

, the STP system

reconfigures the network so that traffic from segment 2 flows through
Bridge B.

Figure 15

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.

Содержание 3C17705

Страница 1: ... http www 3com com SuperStack II Switch 9100 User Guide Part No DUA1770 5AAA01 Published January 2000 ...

Страница 2: ...lowing All technical data and computer software are commercial in nature and developed solely at private expense Software is delivered as Commercial Computer Software as defined in DFARS 252 227 7014 June 1995 or as a commercial item as defined in FAR 2 101 a and as such is provided with only such rights as are provided in 3Com s standard commercial license for the Software Technical data is provi...

Страница 3: ...15 Summary of Features 15 Port Connections 16 Full duplex 17 Load Sharing 17 Switch Operation 17 Virtual LANs VLANs 17 Spanning Tree Protocol STP 18 Quality of Service QoS 18 Network Configuration Example 18 Switch 9100 Front View 20 Ports 20 LEDs 21 Switch 9100 Rear View 22 Power Sockets 23 Serial Number 23 MAC Address 23 Console Port 23 Reset Button 23 Factory Defaults 23 ...

Страница 4: ...SWITCH Understanding the Command Syntax 34 Syntax Helper 34 Command Completion with Syntax Helper 34 Abbreviated Syntax 35 Command Shortcuts 35 Switch 9100 Numerical Ranges 35 Names 35 Symbols 36 Line Editing Keys 37 Command History 37 Common Commands 37 Configuring Management Access 40 Default Accounts 41 Changing the Default Password 41 Creating a Management Account 42 Viewing Accounts 42 Deleti...

Страница 5: ...ing and Disabling SNMP 54 Checking Basic Connectivity 54 Configuring Switch 9100 Port Speed and Duplex Setting 55 100 1000BASE T Ports 55 1000BASE SX Ports 55 Enabling Autonegotiation 55 Flow Control 56 Switch 9100 Port Commands 56 Load Sharing on the Switch 9100 58 Load Sharing Algorithms 58 Configuring Switch 9100 Load Sharing 59 Load Sharing Example 59 Verifying the Load Sharing Configuration 6...

Страница 6: ... on the Switch 76 VLAN Configuration Examples 77 Displaying VLAN Settings 78 Deleting VLANs 79 5 FORWARDING DATABASE FDB Overview of the FDB 81 FDB Contents 81 FDB Entry Types 81 How FDB Entries Get Added 82 Associating a QoS Profile with an FDB Entry 82 Configuring FDB Entries 83 FDB Configuration Examples 83 Displaying FDB Entries 84 Removing FDB Entries 85 6 SPANNING TREE PROTOCOL STP Overview ...

Страница 7: ...C addresses 103 Dynamic MAC Addresses 103 Blackhole 104 Broadcast Unknown Rate Limiting 104 Verifying MAC Based QoS Settings 104 Packet Groupings 104 802 1p Packets 105 Physical and Logical Groupings 105 Source Port 106 VLAN 106 Verifying Physical and Logical Groupings 106 Verifying Configuration and Performance 107 Displaying QoS Information 107 QoS Monitor 107 Modifying a QoS Policy 108 Configur...

Страница 8: ... Switch 122 Configuring RMON 123 Event Actions 123 9 USING THE WEB INTERFACE Enabling and Disabling Web Access 125 Setting Up Your Browser 126 Accessing the Web Interface 126 Navigating the Web Interface 127 Task Frame 127 Content Frame 128 Browser Controls 128 Status Messages 128 Standalone Buttons 128 Saving Changes 129 10 SOFTWARE UPGRADE AND BOOT OPTIONS Downloading a New Image 131 Rebooting t...

Страница 9: ...ope 144 Lithiumbatterie 145 B TECHNICAL SPECIFICATIONS C TROUBLESHOOTING Port Configuration 152 VLANs 153 STP 155 D TECHNICAL SUPPORT Online Technical Services 157 World Wide Web Site 157 3Com Knowledgebase Web Services 157 3Com FTP Site 158 3Com Bulletin Board Service 158 Access by Analog Modem 158 Access by Digital Modem 159 3Com Facts Automated Fax Service 159 Support from Your Network Supplier...

Страница 10: ...GLOSSARY INDEX INDEX OF COMMANDS 3COM CORPORATION LIMITED WARRANTY EMC STATEMENTS ...

Страница 11: ... SNMP If release notes are shipped with your product and the information there differs from the information in this guide follow the instructions in the release notes Terminology Throughout this guide the term Switch 9100 is used to refer to the SuperStack II Switch 9100 For definitions of other terms used in this guide refer to the Glossary located at the end of the user guide The terms Forwardin...

Страница 12: ...ommand means that you must enter the command exactly as shown and then press Return or Enter Commands appear in bold Example To remove the IP address enter the following command SETDefault 0 IP NETaddr 0 0 0 0 The words enter and type When you see the word enter in this guide you must type something and then press Return or Enter Do not press Return or Enter when an instruction simply says type Ke...

Страница 13: ...uperStack II Switch 9100 system SuperStack II Switch 9100 Release Note These notes provide information about the system software release including new features and bug fixes They also provide information about any changes to the SuperStack II Switch 9100 system s documentation Year 2000 Compliance For information on Year 2000 compliance and 3Com products visit the 3Com Year 2000 Web page http www ...

Страница 14: ...14 ABOUT THIS GUIDE ...

Страница 15: ...ve the needs of today s network users Part of the 3Com SuperStack II range of products the Switch 9100 provides switching between six 100 1000BASE TX ports and two 1000BASE SX ports Summary of Features The Switch 9100 has the following features Six autosensing 100 1000BASE TX ports and two 1000BASE SX ports Support for 128K addresses in the switch forwarding database Fully nonblocking operation Al...

Страница 16: ...gement Protocol SNMP Remote Monitoring RMON groups 1 to 4 statistics history alarms and events Repeater and Bridge Management Information Base MIB Easy software upgrades BOOTP for automatic Internet Protocol IP address configuration Local management Console command line interface CLI connection Telnet CLI connection Web based management interface Traffic mirroring for all ports Port Connections Th...

Страница 17: ...n on load sharing refer to Chapter 3 Switch Operation The Switch 9100 uses the same algorithm as a conventional 802 1d bridge for filtering forwarding and learning packets Virtual LANs VLANs The Switch 9100 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 tha...

Страница 18: ...e QoS The Switch 9100 has a Policy Based Quality of Service QoS feature that enables you to specify service levels for different traffic groups By default all traffic is assigned the normal QoS policy profile If needed you can create other QoS policies and apply them to different traffic types so that they have different guaranteed minimum bandwidth maximum bandwidth and priority For more informat...

Страница 19: ...e Switch 9100 by way of two Gigabit Ethernet links The two Gigabit Ethernet fiber ports on the Switch 9100 connect 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 9100 To Backbone Server Workstation Key Fast Ethernet Gigabit Ethernet Switch 3300 Switch 3300 S...

Страница 20: ...t be used as telephone sockets Only connect RJ 45 data connectors to these sockets Either shielded or unshielded data cables with shielded or unshielded jacks can be connected to these data sockets AVERTISSEMENT Les ports RJ 45 Il s agit de prises femelles blindées de données RJ 45 Vous ne pouvez pas les utiliser comme prise de téléphone Branchez uniquement des connecteurs de données RJ 45 sur ces...

Страница 21: ...tances listed in Table 3 For more information on 1000BASE SX characteristics refer to IEEE Draft P802 3z D4 2 Tables 38 2 and 38 6 LEDs Table 4 describes the LED behavior on the Switch 9100 Table 3 Media Types and Distances Standard Media Type Mhz Km Rating Maximum Distance 100BASE TX Category 5 UTP Cable 100Mbps 100 m 1000BASE T Category 5 UTP Cable 1000Mbps 100 m 1000BASE SX 850 nm 62 5 125 µm M...

Страница 22: ...X operation Unit Status LED Power 1 and Power 2 Green Yellow Off Either or both LEDs green indicates the Switch 9100 is powered up A yellow power LED indicates a power overheat or fan failure on the corresponding PSU Both LEDs off indicates the Switch 9100 is powered off MGMT Green Green flashing 1Hz Green flashing 0 5Hz Yellow The Switch 9100 is operating normally Power On Self Test POST complete...

Страница 23: ...ctor is used to connect a terminal and to carry out local out of band management Reset Button The reset button reinitializes the switch The unit reboots with the last saved configuration settings Factory Defaults Table 5 shows the factory defaults for the Switch 9100 features Table 5 Switch 9100 Factory Defaults Item Default Setting Console port configuration 9600 baud eight data bits one stop bit...

Страница 24: ...t Forwarding database aging period 300 seconds 5 minutes IGMP Enabled IGMP snooping Enabled Port status Enabled on all ports 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 BOOTP Enabled on the default VLAN de...

Страница 25: ...nt d installer ou d enlever tout composant du Switch 9100 ou d entamer une procédure de maintenance lisez les informations relatives à la sécurité qui se trouvent dans l Appendice A de ce guide WARNHINWEIS Sicherheitsinformationen Bevor Sie Komponenten aus dem Switch 9100 entfernen oder dem Switch 9100 hinzufuegen oder Instandhaltungsarbeiten verrichten lesen Sie die Sicherheitsanweisungen die in ...

Страница 26: ...s not restricted You should provide a minimum of 75mm 3 in clearance No objects are placed on top of the unit Units are not stacked more than four high if the switch is free standing Configuration Rules for Ethernet The connectors supported media types and maximum distances for the Switch 9100 are described in Chapter 1 Installing the Switch 9100 The Switch 9100 can be mounted in a rack or placed ...

Страница 27: ... Figure 4 Figure 4 Fitting the mounting bracket 5 Repeat the three previous steps for the other side of the switch 6 Refer to the instructions that shipped with your rack runners shelf or tray to complete the installation 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 ...

Страница 28: ...s 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 9100 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 switch must be configured with the same setti...

Страница 29: ...DSR data set ready 6 In RTS request to send 7 Out CTS clear to send 8 In Table 6 Console Connector Pinouts continued Function Pin Number Direction Screen TxD RxD Ground RTS CTS DSR DCD DTR Cable connector 9 pin female Switch 9100 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 91_ser1 ...

Страница 30: ...follow these steps 1 Connect one or both power cables to the switch 2 Connect the power cable s to the wall outlet s The switch automatically powers up once it has been connected to the wall outlet Checking the Installation After turning on power to the Switch 9100 the device performs a Power On Self Test POST Power On Self Test POST During the POST all ports are temporarily disabled the packet LE...

Страница 31: ...r privileges For example login admin Administrator capabilities allow you to access all switch functions For more information on switch security refer to Chapter 3 4 At the password prompt press Return The default name admin has no password assigned When you have successfully logged on to the switch the command line prompt displays the name of the switch in its prompt 5 Assign an IP address and su...

Страница 32: ...32 CHAPTER 2 INSTALLATION AND SETUP ...

Страница 33: ...tch management methods Configuring SNMP Checking basic connectivity Enabling and disabling individual ports Configuring the port speed 100 1000BASE TX ports only Configuring half or full duplex mode Creating load sharing groups on multiple ports For configuration changes to be retained through a power cycle or reboot you must issue a SAVE command after you have made the change For more information...

Страница 34: ...want the parameter to be set Values include numerics strings or addresses depending on the parameter 3 After entering the complete command press Return If an asterisk appears in front of the command line prompt it indicates that you have outstanding configuration changes that have not been saved For more information on saving configuration changes refer to Chapter 10 Syntax Helper The CLI has a bu...

Страница 35: ... VLAN name create vlan engineering Once you have created the VLAN with a unique name you can then eliminate the keyword vlan from all other commands that require the name to be entered For example instead of entering the Switch 9100 command config vlan engineering delete port 1 3 6 you could enter the following shortcut config engineering delete port 1 3 6 Switch 9100 Numerical Ranges Commands tha...

Страница 36: ...arguments can be specified For example in the syntax use image primary secondary you must specify either the primary or secondary image 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 readonly readwrite string you must specify either the read or write com...

Страница 37: ...f the line Insert Toggles on and off When toggled on inserts text and shifts previous text to right Left Arrow Moves cursor to left Right Arrow Moves cursor to right Ctrl L Clears the screen and moves the cursor to the beginning of the line Ctrl U Clears all characters typed from the cursor to the beginning of the line Ctrl W Deletes the previous word Up Arrow Displays the previous command in the ...

Страница 38: ...ot set the year past 2023 config timezone gmt_offset autodst noautodst Configures the time zone information to the configured offset from GMT time The format of gmt_offset is minutes from GMT time Specify autodst Enables automatic Daylight Savings Time change nosautodst Disables automatic Daylight Savings Time change The default setting is autodst config vlan name ipaddress ip_address mask Configu...

Страница 39: ... removes any previously configured access profile assignment history Displays the previous 49 commands entered on the switch clear session number Terminates a Telnet session from the switch disable bootp vlan name all Disables BOOTP for one or more VLANs disable cli config logging Disables logging CLI configuration commands to the syslog for auditing purposes disable clipaging Disables pausing at ...

Страница 40: ...nge the password associated with any account name The administrator can disconnect a management session that has been established by way of a Telnet connection If this happens the user logged on by way of the Telnet connection is notified that the session has been terminated If you have logged on with administrator capabilities the command line prompt ends with a sign For example 3C17705 18 The pr...

Страница 41: ...maximum of 12 characters User names and passwords are case sensitive To add a password to the default admin account follow these steps 1 Log in to the switch using the name admin 2 At the password prompt press Return 3 Add a default admin password by typing the following config account admin 4 Enter the new password at the prompt 5 Re enter the new password at the prompt Table 10 Default Accounts ...

Страница 42: ...ment Account The switch can have a total of 16 management accounts You can use the default names admin and user or you can create new names and passwords for the accounts Passwords must have a minimum of four characters and can have a maximum of 12 characters To create a new account follow these steps 1 Log in to the switch as admin 2 At the password prompt press Return or enter the password that ...

Страница 43: ...t Internet Explorer 3 0 or greater Use an SNMP Network Manager over a network running the IP protocol The switch can support multiple user sessions concurrently as follows One console session Eight Telnet sessions One Web session Using the Console Interface The CLI built into the switch is accessible by way of the 9 pin RS 232 port labelled console located on the back of the Switch 9100 For more i...

Страница 44: ...Access Profile Configuration Commands Command Description config access profile access_profile add ipaddress ipaddress subnet_mask Adds an IP address to the access profile config access profile access_profile delete ipaddress ipaddress subnet_mask Deletes an IP address from the access profile config access profile access_profile mode permit deny Configures the access profile to be one of the follo...

Страница 45: ...s The following rules apply when using access profiles Only one access profile can be applied to each application The access profile can either permit or deny the entries in the profile The same access profile can be applied to more than one application There is an implicit aspect to access profiles For instance if an access profile of mode permit is applied then all other sources are assumed deni...

Страница 46: ...cify the IP address of the device that you want to manage Check the user manual supplied with the Telnet facility if you are unsure of how to do this Once the connection is established you will see the switch prompt and you may log in Connecting to Another Host Using Telnet You can Telnet from the current CLI session to another host using the following command telnet ipaddress port_number If the T...

Страница 47: ...to get their IP address use the same MAC address Therefore if you are using BOOTP relay through a router the BOOTP server must be capable of differentiating its relay based on the gateway portion of the BOOTP packet Manually Configuring the IP Settings If you are using IP without a BOOTP server you must enter the IP parameters for the switch in order for the SNMP Network Manager Telnet software or...

Страница 48: ...inistrator privileges enter them at the login prompt 4 At the password prompt enter the password and press Return When you have successfully logged in to the switch the command line prompt displays the name of the switch in its prompt 5 Assign an IP address and subnetwork mask for the default VLAN by using the following command config vlan name ipaddress ipaddress subnet_mask For example config vl...

Страница 49: ...ogged in by way of the Telnet connection is notified that the session has been terminated To terminate a Telnet session follow these steps 1 Log in to the switch with administrator privileges 2 Determine the session number of the session you want to terminate by using the following command show session 3 Terminate the session by using the following command clear session session_number Disabling Te...

Страница 50: ...dress Resolution Protocol ARP table Specify the IP address and MAC address of the entry config iparp delete ipaddress Deletes an entry from the ARP table Specify the IP address of the entry config iparp timeout minutes Configures the IP ARP timeout period The default setting is 20 minutes A setting of 0 disables ARP aging clear iparp ipaddress vlan name Removes dynamic entries in the IP ARP table ...

Страница 51: ... 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 The following sections describe how to get started if you want to use an SNMP manager It assumes you are already familiar with SNMP m...

Страница 52: ...d community strings provide read only access to the switch The default read only community string is public Read write community strings provide read and write access to the switch The default read write community string is private A total of eight community strings can be configured on the switch The community string for all authorized trap receivers must be configured on the switch for the trap ...

Страница 53: ...um of six trap receivers is allowed config snmp community readonly readwrite string Adds an SNMP read or read write community string The default readonly community string is public The default readwrite community string is private Each community string can have a maximum of 126 characters and can be enclosed by double quotation marks config snmp delete trapreceiver ip_address community string all ...

Страница 54: ...ng request fails the switch continues to send ping messages until interrupted Press any key to interrupt a ping request Table 14 SNMP Reset and Disable Commands Command Description disable snmp access Disables SNMP on the switch Disabling SNMP access does not affect the SNMP configuration for example community strings disable snmp traps Prevents SNMP traps from being sent from the switch Does not ...

Страница 55: ...all ports operate at full duplex only Autonegotiation is mandatory for a 1000BASE TX connection so cannot be disabled if a 1000BASE TX connection is required If you do not want your 100 1000BASE TX ports to autonegotiate you can select to manually configure the speed to 100 Mbps and the duplex setting to full or half duplex operation To disable autonegotiation and configure port speed and duplex s...

Страница 56: ...d to the master port config ports portlist auto on Enables autonegotiation for the particular port type 802 3u for 100 1000 Mbps ports or 802 3z for Gigabit Ethernet ports config ports portlist auto off speed 100 1000 duplex half full Changes the configuration of a group of ports Specify the following auto off The port will not autonegotiate the settings speed The speed of the port for 100 1000 Mb...

Страница 57: ...ays the port configuration show ports portlist info Displays detailed system related information show ports portlist packet Displays a histogram of packet statistics show ports portlist qosmonitor Displays real time QoS statistics For more information on QoS refer to Chapter 7 show ports portlist rxerrors Displays real time receive error statistics For more information on error statistics refer to...

Страница 58: ...mber of ports on the switch For example traffic transmitted to a two port load sharing group should originate from a minimum of two other ports on the same switch This feature is supported between Switch 9100 devices only but may be compatible with third party trunking or sharing algorithms Check with your supplier for more information Load Sharing Algorithms Load sharing algorithms allow you to s...

Страница 59: ...ogical port representing the entire port group When configuring load sharing the following rules apply A group can contain any combination of 2 to 8 ports The ports in a group do not need to be contiguous To define a load sharing group you assign a group of ports to a single logical port number To enable or disable a load sharing group use the following commands enable sharing master_port grouping...

Страница 60: ...network analyzer or RMON probe for packet analysis The switch uses a traffic filter that copies a group of traffic to the monitor port The traffic filter can be defined based on one of the following criteria MAC source address destination address All data sent to or received from a particular source or destination MAC address is copied to the monitor port For MAC mirroring to work correctly the MA...

Страница 61: ...lan default Table 17 Switch 9100 Port Mirroring Configuration Commands Command Description enable mirroring to port Dedicates a port to be the mirror output port config mirroring add mac mac_address vlan name port port vlan name port port Adds a single mirroring filter definition Up to eight mirroring definitions can be added You can mirror traffic from a MAC address a VLAN a physical port or a sp...

Страница 62: ...62 CHAPTER 3 ACCESSING THE SWITCH ...

Страница 63: ...hat physically connects them The segments are defined by flexible user groups you create with the command line interface Benefits Implementing VLANs on your networks has the following advantages VLANs help to control traffic With traditional networks congestion can be caused by broadcast traffic that is directed to all network devices regardless of whether they require it VLANs increase the effici...

Страница 64: ...reduces the flooding of IP multicast traffic optimizes the usage of network bandwidth and prevents multicast traffic from being flooded to parts of the network that do not need it The switch does not reduce any IP multicast traffic in the local multicast domain 224 0 0 x An optional optimization for IGMP snooping is the strict recognition of multicast routers only if the remote devices have joined...

Страница 65: ... the switch forwards all multicast traffic to any IP router config igmp query_interval query_response_interval last_member_query_interval Configures the IGMP timers Timers are based on RFC2236 Specify the following query_interval The amount of time in seconds the system waits between sending out General Queries The range is 1 to 2 147 483 647 seconds 68 years The default setting is 125 seconds que...

Страница 66: ...147 483 647 seconds 68 years The default setting is 260 seconds host_timeout The interval in seconds between the last IGMP group report message from the host and the current time The range is 10 to 2 147 483 647 seconds 68 years The default setting is 260 seconds show igmp snooping vlan name Displays IGMP snooping registration information and a summary of all IGMP timers and states disable igmp vl...

Страница 67: ...h 9100 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 an IP router Spanning Switches with Port Based VLANs To create a port based VLAN that spans two switches you must do two things Assign the port on each switch to the VLAN Cable the two switches together using one port on each switch per VLAN...

Страница 68: ...n two switches in a port based VLAN a port on Switch 1 must be cabled to a port on Switch 2 for each VLAN you want to have span across the switches At least one port on each Switch 9100 must be a member of the VLANs as well Figure 9 illustrates two VLANs spanning two switches On Switch 1 ports 1 through 3 are part of VLAN Accounting ports 5 through 8 are part of VLAN Engineering On Switch 2 ports ...

Страница 69: ...e a dedicated port for each VLAN Each dedicated port must be connected to a port that is a member of its VLAN on the next switch Tagged VLANs Tagging is a process that inserts a marker called a tag into the Ethernet frame The tag contains the identification number of a specific VLAN called the VLANid The use of 802 1Q tagged packets may lead to the appearance of packets slightly bigger than the cu...

Страница 70: ...d VLAN It can be a member of any number of tagged VLANs and all additional VLAN membership for the port must be accompanied by tags In addition to configuring the VLAN tag for the port the server must have a Network Interface Card NIC that supports 802 1Q tagging Assigning a VLAN Tag When a VLAN is configured to support tagging it is assigned a tag As individual ports are added to a tagged VLAN yo...

Страница 71: ...Figure 11 Logical diagram of tagged and untagged traffic Switch 1 Switch 2 Marketing Sales M S Tagged port 802 1Q Tagged server 91_006 7 8 4 5 6 1 2 3 S S M 7 8 4 5 6 1 2 3 S M M 91_007 Tagged Ports Sales Switch 1 Port 3 Port 6 Switch 1 Port 1 Port 8 Switch 2 Port 2 Switch 2 Port 8 Marketing Switch 1 Port 4 Switch 2 Port 1 Port 5 ...

Страница 72: ... of multiple VLANs with the stipulation that only one of its VLANs uses untagged traffic In other words a port can simultaneously be a member of one port based VLAN one specific protocol based VLAN and multiple tag based VLANs For the purposes of VLAN classification packets arriving on a port with an 802 1Q tag containing a VLANid of zero are treated as untagged Protocol Based VLANs Protocol based...

Страница 73: ...ined Protocol Filters The following protocol filters are predefined on the switch IP IPX NetBIOS DECNet IPX_8022 IPX_SNAP AppleTalk 91_008 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 ...

Страница 74: ...lude etype EtherType The values for etype are four digit hexadecimal numbers taken from a list maintained by the IEEE This list can be found at the following URL http standards ieee org regauth ethertype index html llc LLC Service Advertising Protocol SAP The values for llc are four digit hexadecimal numbers that are created by concatenating a two digit LLC Destination SAP DSAP and a two digit LLC...

Страница 75: ...me that can be up to 32 characters VLAN names can use standard alphanumeric characters The following characters are not permitted in a VLAN name Space Comma Quotation mark VLAN names must begin with an alphabetical letter Quotation marks can be used to enclose a VLAN name that does not begin with an alphabetical character or that contains a space comma or other special character VLAN names are loc...

Страница 76: ...named VLAN create protocol protocol_name Creates a user defined protocol enable ignore stp vlan name Enables a VLAN from using STP port information When enabled all virtual ports associated with the VLAN are in STP forwarding mode The default setting is disabled config dot1p ethertype ethertype Configures an IEEE 802 1Q Ethertype Use this command only if you have another switch that supports 802 1...

Страница 77: ...ag 1000 config video add port 4 8 tagged config vlan name add port portlist tagged untagged Adds one or more ports to a VLAN You can specify tagged port s untagged port s By default ports are untagged config vlan name delete port portlist tagged untagged Deletes one or more ports from a VLAN config vlan name protocol protocol_name any Configures a protocol based VLAN If the keyword any is specifie...

Страница 78: ...e vlan ipsales config ipsales protocol ip config ipsales add port 1 3 6 8 The following Switch 9100 example defines a protocol filter myprotocol and applies it to the VLAN named myvlan This is an example only and has no real world application create protocol myprotocol config protocol myprotocol add etype 0xf0f0 config protocol myprotocol add etype 0xffff create vlan myvlan config myvlan protocol ...

Страница 79: ...ng the following Protocol name List of protocol fields VLANs that use the protocol Deleting VLANs To delete a VLAN or to return VLAN settings to their defaults use the commands listed in Table 20 Table 20 VLAN Delete and Reset Commands Command Description disable ignore stp vlan name Allows a VLAN to use STP port information unconfig vlan name ipaddress Resets the IP address of the VLAN delete vla...

Страница 80: ...80 CHAPTER 4 VIRTUAL LANS VLANS ...

Страница 81: ...s in the database are dynamic Entries in the database are removed aged out if after a period of time aging time the device has not transmitted This prevents the database from becoming full with obsolete entries by ensuring that when a device is removed from the network its entry is deleted from the database Dynamic entries are deleted from the database if the switch is reset or a power off on cycl...

Страница 82: ... destination address must be discarded Blackhole entries are treated like permanent entries in the event of a switch reset or power off on cycle Blackhole entries are never aged out of the database How FDB Entries Get Added Entries are added into the FDB in the following two ways The switch can learn entries The system updates its FDB with the source MAC address from a packet the VLAN and the port...

Страница 83: ...ortlist Port numbers associated with MAC address dynamic Specifies that the entry will be learned dynamically Used to associated a QoS profile with a dynamically learned entry qosname QoS profile associated with MAC address If more than one port number is associated with a permanent MAC entry packets are multicast to the multiple destinations config fdb agingtime number Configures the FDB aging ti...

Страница 84: ...96BF3150 VLAN name is net34 The entry will be learned dynamically QoS profile qp2 will be applied when the entry is learned Displaying FDB Entries To display FDB entries use the command show fdb mac_address vlan name portlist permanent where the following is true mac_address Displays the entry for a particular MAC address vlan name Displays the entries for a VLAN portlist Displays the entries for ...

Страница 85: ...of all entries by using the commands listed in Table 22 Table 22 Removing FDB Entry Commands Command Description delete fdbentry mac_address vlan name Deletes a permanent FDB entry clear fdb mac_address vlan name portlist Clears dynamic FDB entries that match the filter When no options are specified the command clears all FDB entries ...

Страница 86: ...86 CHAPTER 5 FORWARDING DATABASE FDB ...

Страница 87: ... Spanning Tree Protocol STP is a bridge 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 w...

Страница 88: ...allows you to use this configuration because STP detects duplicate paths and immediately prevents or blocks one of them from forwarding traffic Figure 14 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 14 Traffic flowing through Bridges C and A ...

Страница 89: ...on 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 Identif...

Страница 90: ... 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 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 own Root Bridge an...

Страница 91: ...ins 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 STP Configurations When you assign VLANs to an STPD pay careful attention to the STP configuration and its effect on the forwarding of VLAN traffic Figure 16 illustrates a network that uses VLAN tagging for trunk connections The following four VLANs have been defi...

Страница 92: ...ging loops are prevented The VLAN Marketing which has not been assigned to either STPD1 or STPD2 communicates using all five switches The topology has no loops because STP has already blocked the port connection between Switch A and Switch B and between Switch Y and Switch Z Within a single STPD you must be extra careful when configuring your VLANs Figure 17 illustrates a network that has been inc...

Страница 93: ...witches form a triangular loop that is not permitted in an STP topology All VLANs in each switch are members of the same STPD 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 VLAN marketing Therefore if the trunk for VLAN marketing on Switches 1 and 3 is blocked the traffic for VLAN marketing will ...

Страница 94: ...command enable stpd stpd_name All VLANs belong to a STPD If you do not want to run STP on a VLAN you must add the VLAN to a STPD that is disabled Once you have created the STPD you can optionally configure STP parameters for the STPD You should not configure any STP parameters unless you have considerable knowledge and experience with STP The default STP parameters are adequate for most networks T...

Страница 95: ...ecifies 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 Specifies the time in seconds that the ports in this STPD spend in the listening and learning states when the switch is the Root Bridge The range is 4 through 30 The default setting is 15 se...

Страница 96: ...me Bridge ID STPD configuration information config stpd stpd_name port cost value portlist Specifies the path cost of the port in this STPD The range is 1 through 65 535 The switch automatically assigns a default path cost based on the speed of the port as follows For a 100Mbps port the default cost is 19 For a 1000Mbps port the default cost is 4 config stpd stpd_name port priority value portlist ...

Страница 97: ... Table 24 Table 24 STP Disable and Reset Commands Command Description delete stpd stpd_name Removes an STPD An STPD can only be removed if all VLANs have been deleted from it The default STPD s0 cannot be deleted disable stpd stpd_name Disables the STP mechanism on a particular STPD or for all STPDs disable stpd port portlist Disables STP on one or more ports Disabling STP on one or more ports put...

Страница 98: ...98 CHAPTER 6 SPANNING TREE PROTOCOL STP ...

Страница 99: ... priority than data traffic using QoS you can assign a different QoS profile to those VLANs that are transmitting video traffic Building Blocks The service that a particular type of traffic receives is determined by assigning a QoS profile to a traffic grouping or classification The building blocks are defined as follows QoS profile Defines bandwidth and prioritization parameters Traffic grouping ...

Страница 100: ... follows qp1 qp2 qp3 qp4 qp5 qp6 qp7 qp8 The parameters that make up a QoS profile include the following Minimum bandwidth The minimum percentage of link bandwidth that the traffic requires The system is required to provide the minimum amount of bandwidth to the traffic The lowest possible value is 0 Maximum bandwidth The maximum percentage of link bandwidth that the traffic is permitted to use Pr...

Страница 101: ...o parameters of the eight pre defined QoS profiles have the corresponding effect on the ports The direct mapping is straight forward to understand and configure Queue setting at any instant at a port depends on the QoS profiles associated with the traffic through that port The minimum bandwidth is the sum of all the minimum values of the QoS profiles sharing a queue The maximum bandwidth setting i...

Страница 102: ...ffic grouping is a classification of traffic that has one or more attributes in common Traffic groupings are separated into the following categories for discussion Destination MAC MAC QoS groupings Packet priority information such as 802 1p Physical logical configuration physical source port or VLAN association A QoS profile is assigned to a desired traffic grouping to form a QoS Policy In the eve...

Страница 103: ...ple create fdbentry 00 11 22 33 44 55 vlan default port 1 qosprofile qp2 Dynamic MAC Addresses Dynamic MAC addresses can be assigned a QoS profile whenever traffic is destined to the MAC address For any port on which the specified MAC address is learned in the specified VLAN the port is assigned the specified QoS profile For example create fdbentry 00 11 22 33 44 55 vlan default dynamic qosprofile...

Страница 104: ...ckets to a QoS profile that has the desired priority and bandwidth parameters Broadcast unknown rate limiting is an extension of the QoS feature used for destination MAC addresses For example if you want to limit broadcast and unknown traffic on the VLAN default to the bandwidth and priority defined in QoS profile qp3 the command is create fdbentry ff ff ff ff ff ff vlan default dynamic qp3 Verify...

Страница 105: ...alues and associated QoS profiles use the following commands config dot1p type dot1p_value qosprofile qosname This command changes the default mapping of 802 1p values and QoS profiles enable dot1p replacement ports portlist all This command allows the switch to overwrite the ingress 802 1p value with the value configured for the QoS profile Physical and Logical Groupings Two traffic groupings exi...

Страница 106: ...traffic grouping indicates that all intra VLAN switched traffic sourced from the named VLAN uses the indicated QoS profile To configure a VLAN traffic grouping use the following command config vlan name qosprofile qosname For example all devices on VLAN servnet require use of QoS profile qp4 for both traffic between devices on follows as well as traffic sourced on servnet The command to configure ...

Страница 107: ...destination MAC entries and their QoS profiles show vlan Displays the QoS profile assignments to the VLAN show ports info Displays information including QoS information for the port QoS Monitor The QoS monitor is a utility that monitors the hardware queues associated with any port s The QoS monitor keeps track of the number of frames and the frames per second that a specific queue is responsible f...

Страница 108: ...S profile to a traffic grouping the timing of the configuration change depends on the traffic grouping involved To have a change in QoS profile effect a change in the QoS policy the following rules apply For destination MAC based grouping other than permanent clear the MAC FDB using the command clear fdb This command should also be issued after a policy is first formed as the policy must be in pla...

Страница 109: ...l Configures a QoS profile Specify minbw The minimum bandwidth percentage guaranteed to be available to this queue The default setting is 0 maxbw The maximum bandwidth percentage this queue is permitted to use The default setting is 100 priority The service priority for this queue Settings include low normal medium and high The default setting is low config ports portlist qosprofile qosname Allows...

Страница 110: ...110 CHAPTER 7 QUALITY OF SERVICE QOS ...

Страница 111: ...ends emerging and notice problems arising before they cause major network faults This way statistics can help you get the best out of your network Status Monitoring The status monitoring facility provides information about the switch This information may be useful for your technical support representative if you have a problem The Switch 9100 includes many show commands that display information ab...

Страница 112: ...ty level of messages being logged locally and the priority level of messages being sent to the syslog host show memory Displays the current system memory information show switch Displays the current switch information including sysName sysLocation sysContact MAC address Current time and time and system uptime Operating environment temperature fans and power supply status NVRAM image information pr...

Страница 113: ...hat have been successfully transmitted by the port Transmit Byte Count Tx Byte Count The total number of data bytes successfully transmitted by the port Total Collisions The total number of collisions seen by the port regardless of whether a device connected to the port participated in any of the collisions Received Packet Count Rx Pkt Count The total number of good packets that have been received...

Страница 114: ...er the first transmission attempt was deferred by other network traffic Transmit Errored Frames TX Err The total number of frames that were not completely transmitted by the port because of network errors such as late collisions or excessive collisions To view port receive errors use the following command show ports portlist rxerrors The following port receive error information is collected by the...

Страница 115: ...log tracks all configuration and fault information pertaining to the device Each entry in the log contains the following information Timestamp The timestamp records the month and day of the event along with the 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 32 describes the three levels of importance that the s...

Страница 116: ...itical emergency alert error warning notice info and debug If not specified informational priority messages and higher are displayed Table 32 Fault Levels Assigned by the Switch Level Description Critical A desired switch function is inoperable The switch may need to be reset Warning A noncritical error that may lead to a function failure Informational Actions and events that are consistent with e...

Страница 117: ...tch supports remote logging by way of the UNIX syslog host facility Up to four syslogs may be configured To enable remote logging 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 add delete ipaddress facility priority Specify the following ip...

Страница 118: ...e syslog host Options include ipaddress The IP address of the syslog host facility The syslog facility level for local use local0 local7 priority Filters the log to display messages with the selected priority or higher more critical Priorities include critical emergency alert error warning notice info and debug If not specified only critical priority messages and are sent to the syslog host disabl...

Страница 119: ...orce IETF documents RFC 1271 and RFC 1757 which allows you to monitor LANs remotely A typical RMON setup consists of the following two components RMON probe An intelligent remotely controlled device or software agent that continually collects statistics about a LAN segment or VLAN The probe transfers the information to a management workstation on request or when a predefined threshold is crossed M...

Страница 120: ...etwork performance by taking periodic samples of the counters supplied by the Statistics group The group features user defined sample intervals and bucket counters for complete customization of trend analysis The group is useful for analysis of traffic patterns and trends on a LAN segment or VLAN and to establish baseline information indicating normal operating parameters Alarms The Alarms group p...

Страница 121: ...ncy It allows you to manage the network in a more proactive manner It reduces 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 elim...

Страница 122: ...d the switch can take autonomous 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 35 details the RMON supp...

Страница 123: ...ics on the switch use the following command enable disable rmon By default RMON is disabled However even in the disabled state the switch response to RMON queries and sets for alarms and events By enabling RMON the switch begins the processes necessary for collecting switch statistics Event Actions The actions that you can define for each alarm are shown in Table 36 To be notified of events using ...

Страница 124: ...124 CHAPTER 8 STATUS MONITORING AND STATISTICS ...

Страница 125: ... configuring and monitoring the switch If a particular command is not available using the Web Interface you must use the CLI to access the desired functionality Enabling and Disabling Web Access By default Web access is enabled on the switch To disable it use the following command disable web To re enable Web access use the following command enable web access profile access_profile none port port_...

Страница 126: ...Time you request a page If you are using Microsoft Internet Explorer configure the Temporary Internet Files setting to check for newer versions of stored pages by selecting Every visit to the page Images must be auto loaded Use a high resolution monitor to maximize the amount of information displayed in the content frame The recommended resolution is 1024 x 768 pixels You can also use 800 x 600 pi...

Страница 127: ... After logging in to the switch the Web Interface home page is displayed The Web Interface divides the browser screen into the following sections Task frame Content frame Standalone buttons Task Frame The task frame has two sections menu buttons submenu links There are four task buttons as follows Configuration Statistics Support Logout Below the task buttons are options Options are specific to th...

Страница 128: ...atus messages as follows Information Displays information that is useful to know prior to or as a result of changing configuration options Warning Displays warnings about the switch configuration Error Displays errors caused by incorrectly configured settings Success Displays informational messages after you click Submit The message displayed reads Request was submitted successfully Standalone But...

Страница 129: ...rompts you to save your changes If you select Yes the changes are saved to the selected configuration area To change the selected configuration area you must go to the Configuration task button Switch option Do a Get When Configuring a VLAN When configuring a VLAN using the Web Interface prior to editing the VLAN configuration you must first click the get button to ensure that subsequent edits are...

Страница 130: ...130 CHAPTER 9 USING THE WEB INTERFACE ...

Страница 131: ...ure from either a Trivial File Transfer Protocol TFTP server on the network or from a PC connected to the serial port using the XMODEM protocol Downloading a new image involves the following steps Load the new image onto a TFTP server on your network if you will be using TFTP Load the new image onto a PC if you will be using XMODEM Download the new image to the switch using the command download im...

Страница 132: ... use the cancel option Saving Configuration Changes The configuration is the customized set of parameters that you have selected to run on the switch As you make configuration changes the new settings are stored in run time memory Settings that are stored in run time memory are not retained by the switch when the switch is rebooted To retain the settings and have them load when you reboot the swit...

Страница 133: ...and unconfig switch all Upgrading and Accessing BootROM The BootROM of the switch initializes certain important switch variables during the boot process If necessary BootROM can be upgraded after the switch has booted using TFTP In the event the switch does not boot properly some boot option functions can be accessed through a special BootROM menu Upgrading BootROM Upgrading BootROM is done using ...

Страница 134: ... flash memory press 1 for the image stored in primary or 2 for the image stored in secondary Then press the f key to boot from newly selected on board flash memory To boot to factory default configuration press the d key for default and the f key to boot from the configured on board flash To perform a serial download you can optionally change the baud rate to 38 4K using the b command and then pre...

Страница 135: ...ters are specified the image is saved to the current image XMODEM is not supported over a Telnet session reboot date time cancel Reboots the switch at the date and time specified If you do not specify a reboot time the reboot happens immediately following the command and any previously scheduled reboots are cancelled To cancel a previously scheduled reboot use the cancel option save configuration ...

Страница 136: ...136 CHAPTER 10 SOFTWARE UPGRADE AND BOOT OPTIONS ...

Страница 137: ...ove the unit AVERTISSEMENT Les avertissements présentent des consignes que vous devez respecter pour garantir votre sécurité personnelle Vous devez respecter attentivement toutes les consignes Nous vous demandons de lire attentivement les consignes suivantes de sécurité avant d installer ou de retirer l appareil WARNHINWEIS Warnhinweise enthalten Anweisungen die Sie zu Ihrer eigenen Sicherheit bef...

Страница 138: ...it and easily accessible You can only remove power from the unit by disconnecting the power cord from the outlet U S A and Canada The cord set must be UL approved and CSA certified The minimum specification for the flexible cord is No 18 AWG Type SV or SJ 3 conductor The cord set must have a rated current capacity of at least 10A The attachment plug must be an earth grounding type with a NEMA 5 15...

Страница 139: ...nection to a public telecommunications system This can only be achieved using the console port on the unit and an approved modem WARNING RJ 45 Ports These are shielded RJ 45 data sockets They cannot be used as telephone sockets Only connect RJ 45 data connectors to these sockets Either shielded or unshielded data cables with shielded or unshielded jacks can be connected to these data sockets WARNI...

Страница 140: ... manufacturer s instructions Disposal requirement vary by country and by state Lithium batteries are not listed by the Environment Protection Agency EPA as a hazardous waste Therefore they can typically be disposed of as normal waste If you are disposing of large quantities contact a local waste management service No hazardous compounds are used within the battery module The weight of the lithium ...

Страница 141: ...0 CEI 320 Débranchez les conducteurs électriques secteur avant de procéder à une intervention d entretien courant Etats Unis et Canada Le cordon doit avoir reçu l homologation des UL et un certificat de la CSA Le cordon souple doit respecter à titre minimum les spécifications suivantes calibre 18 AWG type SV ou SJ à 3 conducteurs Le cordon doit être en mesure d acheminer un courant nominal d au mo...

Страница 142: ...terre masse Branchez uniquement un Advanced Redundant Power System 3C16071 avec Type 2 Power Modules et Type 2 câbles sur la prise femelle du Redundant Power System AVERTISSEMENT Les ports RJ 45 Il s agit de prises femelles blindées de données RJ 45 Vous ne pouvez pas les utiliser comme prise de téléphone Branchez uniquement des connecteurs de données RJ 45 sur ces prises femelles Les câbles de do...

Страница 143: ...ons du fabricant pour la mise au rebus des batteries usagées Vous devez vous débarrasser des batteries usées en respectant les consignes du fabricant les réglementations en matière d élimination des batteries varient d un pays à l autre et d un état à l autre les batteries au lithium ne figurent pas sur la liste EPA des déchets dangereux Par conséquent vous pouvez en général vous en débarrasser co...

Страница 144: ...de Konfiguration für einen Geräteeingang gemäß EN60320 IEC320 haben Vor Wartungsarbeiten müssen beide Wechselstromnetzkabel abgezogen werden Die Netzsteckdose muß in der Nähe des Geräts und leicht zugänglich sein Die Stromversorgung des Geräts kann nur durch Herausziehen des Gerätenetzkabels aus der Netzsteckdose unterbrochen werden Europe Das Netzkabel muß vom Typ HO3VVF3GO 75 Mindestanforderung ...

Страница 145: ...ie Anpassung von Leistungen und Verfahren in anderer als der hierin genannten Weise kann zu gefährlichen Laseremissionen führen Lithiumbatterie Die Batterie im bq4830 Gerät ist eingekapselt und kann nicht vom Benutzer ersetzt werden Wenn das Bedienungspersonal entgegen den Anweisungen versucht die bq4830 DS1644 auszutauschen ersetzen Sie die Lithiumbatterie durch eine Batterie der gleichen oder ei...

Страница 146: ... 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 Mangandioxid als Kathodenmaterial BR Chemie verwendet Poly Kohlenstoffmonofluorid als Kathodenmaterial ...

Страница 147: ...perating Humidity 10 to 95 relative humidity noncondensing Standards EN60068 IEC68 Safety Agency Certifications IEC 60950 UL 1950 EN60950 CSA 22 2 No 950 EN60825 1 IEC 825 1 AC Protection 5A 250v Electromagnetic Compatibility CISPR22 Class A EN55022 Class A FCC Part 15 subpart B Class A ICES 003 Class A VCCI Class A EN50082 1 1997 AS NZS 3548 Class A CNS 13438 Class A Korean EMC approval EN61000 3...

Страница 148: ... dot1dBasePortEntry counters are not incremented SNMP MIB II RFC 1213 Bridge MIB RFC 1493 Entity MIB RFC 2037 Evolution of Interfaces MIB RFC 1573 RMON MIB RFC 1757 RMON II Probe Configuration MIB 2021 802 3 MAU MIB RFC 2239 802 3 MAU MIB gigabit draft ietf hubmib mau mib v2 01 Ether like MIB 165 Ether like MIB gigabit draft ietf hubmib etherif mib v2 00 Terminal Emulation Telnet RFC 854 HTTP 1 1 ...

Страница 149: ...lier 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 powered up Both ends of the Gigabit link are set to the same autonegotiation state Both sides if the Gigabit link must be enabled or disabled It the two are different typically the side with autonegotiation disabled will ha...

Страница 150: ...l emulator The settings are 9600 baud 8 data bits 1 stop bit no parity XON OFF flow control enabled The SNMP Network Manager cannot access the device Check that the device IP address subnet mask and default router are correctly configured and that the device has been reset Check that the device IP address is correctly recorded by the SNMP Network Manager refer to the user documentation for the Net...

Страница 151: ...rk cabling at the port Check that the port through which you are trying to access the device is in a correctly configured VLAN Try accessing the device through a different port If you can now access the device a problem with the original port is indicated Re examine the connections and cabling A network problem may be preventing you accessing the device over the network Try accessing the device th...

Страница 152: ... Excessive RX CRC errors When a device that has auto negotiation disabled is connected to a Switch 9100 that has auto negotiation enabled the switch links at the correct speed but in half duplex mode The switch 100 1000 physical interface uses a method called parallel detection to bring up the link Because the other network device does not participating in auto negotiation and does not advertise i...

Страница 153: ...gabit ports These ports need to be set to auto off using the command config port port auto off if you are connecting it to devices that do not support auto negotiation Ensure that you are using multi mode fiber MMF when using a 1000BASE SX port 1000BASE SX does not work with SMF VLANs You cannot add a port to a VLAN If you attempt to add a port to a VLAN and get an error message similar to localho...

Страница 154: ... should have a corresponding VLAN ID for the VLAN on the other switch If you are connecting to a third party device and have checked that the VLAN IDs are the same the Ethertype field used to identify packets as 802 1Q packets may differ between the devices The default value used by the switch is 8100 If the third party device differs from this and cannot be changed you may change the 802 1Q Ether...

Страница 155: ...s complete Specify that STP has been disabled for that VLAN or turn off STP for the switch ports of the endstation and devices to which it is attempting to connect and then reboot the endstation The switch keeps aging out endstation entries in the switch Forwarding Database FDB Reduce the number of topology changes by disabling STP on those systems that do not use redundant paths Specify that the ...

Страница 156: ...156 APPENDIX C TROUBLESHOOTING ...

Страница 157: ...3Com Facts SM Automated Fax Service World Wide Web Site To access the latest networking information on the 3Com Corporation World Wide Web site enter this URL into your Internet browser http www 3com com This service provides access to online support information such as technical documentation and software as well as support options that range from technical education to maintenance and profession...

Страница 158: ...roducts This service is available through analog modem or digital modem ISDN 24 hours a day 7 days a week Access by Analog Modem To reach the service by modem set your modem to 8 data bits no parity and 1 stop bit Call the telephone number nearest you Country Data Rate Telephone Number Australia Up to 14 400 bps 61 2 9955 2073 Brazil Up to 28 800 bps 55 11 5181 9666 France Up to 14 400 bps 33 1 69...

Страница 159: ...e qualified to provide a variety of services including network planning installation hardware maintenance application training and support services When you contact your network supplier for assistance have the following information ready Product model name part number and serial number A list of system hardware and software including revision levels Diagnostic error messages Details about recent ...

Страница 160: ...61 00137 or 021 6350 1590 800 6161 463 00798 611 2230 0 2 3455 6455 0080 611 261 001 800 611 2000 Europe From anywhere in Europe call 31 0 30 6029900 phone 31 0 30 6029999 fax Europe South Africa and Middle East From the following countries you may use the toll free numbers Austria Belgium Denmark Finland France Germany Hungary Ireland Israel Italy 0800 297468 0800 71429 800 17309 0800 113153 0800...

Страница 161: ...9900 31 30 6029999 Latin America 1 408 326 2927 1 408 326 3355 From the following countries you may call the toll free numbers select option 2 and then option 2 Austria Belgium Denmark Finland France Germany Hungary Ireland Israel Italy Netherlands Norway Poland Portugal South Africa Spain Sweden Switzerland U K 0800 297468 0800 71429 800 17309 0800 113153 0800 917959 0800 1821502 00800 12813 1800...

Страница 162: ......

Страница 163: ...have timed out and are no longer valid auto negotiation A feature on twisted pair ports that allows them to advertise their capabilities for speed duplex and flow control When connected to a port that also supports auto negotiation the link can automatically configure itself to the optimum setup backbone The part of a network used as a primary path for transporting traffic between network segments...

Страница 164: ...colliding packets in an Ethernet network Collisions are a part of normal Ethernet operation but a sudden prolonged increase in the number of collisions can indicate a problem with a device particularly if it is not accompanied by a general increase in traffic CSMA CD Carrier sense Multiple Access with Collision Detection The protocol defined in Ethernet and IEEE 802 3 standards in which devices tr...

Страница 165: ... Ethernet it is compatible with existing 10 100Mbps Ethernet standards half duplex A system that allows packets to transmitted and received but not at the same time Contrast with full duplex hub A device that regenerates LAN traffic so that the transmission distance of that signal can be extended Hubs are similar to repeaters in that they connect LANs of the same type however they connect more LAN...

Страница 166: ...c area usually not larger than a floor or building LANs are characterized by high transmission speeds over short distances up to 1000m LLC Logical Link Control A sublayer of the IEEE data link layer that is located above the MAC sublayer The LLC sublayer is responsible for MAC sublayer addressing flow control error control and framing latency The delay between the time a device receives a packet a...

Страница 167: ...d by the Simple Network Management Protocol SNMP to gather information about the devices on a network The Switch contains its own internal MIB multicast A packet sent to a specific group of endstations on a network multicast filtering A system that allows a network device to only forward multicast traffic to an endstation if it has registered that it would like to receive that traffic NIC Network ...

Страница 168: ...ity segment A section of a LAN that is connected to the rest of the network using a switch or bridge server A computer in a network that is shared by multiple endstations Servers provide endstations with access to shared network services such as computer files and printer queues SLIP Serial Line Internet Protocol A protocol that allows IP to run over a serial line console port connection SNAP Subn...

Страница 169: ...ne piece when it reaches its destination IP relates to the address of the endstation to which data is being sent as well as the address of the destination network Telnet A TCP IP application protocol that provides a virtual terminal service letting a user log into another computer system and access a device as if the user were connected directly to the device TFTP Trivial File Transfer Protocol Al...

Страница 170: ...runk A Switch to Switch link that carries traffic for all the VLANs on each Switch WAN Wide Area Network A communications network that covers a wide area A WAN can cover a large geographic area and may contain several LANs within it ...

Страница 171: ...s 128 fonts 126 setting up 126 bulletin board service 158 C CLI command history 37 command shortcuts 35 line editing keys 37 named components 35 numerical ranges 35 symbols 36 syntax helper 34 using command history 37 shortcuts 35 syntax understanding 34 Command Line Interface See CLI common commands table 38 community strings 52 configuration primary and secondary 132 saving changes 132 console p...

Страница 172: ...N group 122 home page 51 126 host configuration commands table 50 I IEEE 802 1Q 69 IGMP description 64 snooping 64 image downloading 131 primary and secondary 132 upgrading 131 installing the switch 26 IP address entering 47 K keys line editing 37 port monitoring 115 L LEDs 21 line editing keys 37 load sharing 59 description 58 load sharing group description 58 master port 59 verifying the configu...

Страница 173: ...DB entry association 82 policy description 99 priority 100 profiles blackhole 102 configuring 109 default 100 description 99 modifying 101 parameters 100 traffic groupings 802 1p 105 description 99 MAC address 103 source port 106 VLAN 106 verifying 107 QoS monitor commands table 108 description 107 logging 108 real time display 107 Quality of Service See QoS R rack mounting 26 receive errors 114 r...

Страница 174: ...e 94 max age 94 overview 87 path cost 94 port priority 94 port state displaying 97 switch logging 115 monitoring 111 Switch 9100 configuration examples 18 dimensions 147 factory defaults 23 free standing installation 27 front view 20 Gigabit Ethernet ports 20 installing 26 LEDs 21 positioning 25 rack mounting 26 rear view 22 RMON features 120 size 147 stacking with other devices 28 weight 147 synt...

Страница 175: ...66 protocol filters 73 protocol based 72 restoring default values 79 tagged 69 trunks 70 types 66 W Web Interface accessing 126 browser controls 128 browser setup 126 description 125 fonts 126 home page 51 126 navigating 127 saving changes 129 screen layout 127 screen resolution 126 status messages 128 VLAN configuration 125 World Wide Web WWW 157 X xmodem 131 ...

Страница 176: ...176 INDEX ...

Страница 177: ...ceiver 53 config snmp community 53 config snmp delete trapreceiver 53 config snmp syscontact 53 config snmp syslocation 53 config snmp sysname 53 config stpd add vlan 94 95 config stpd forwarddelay 95 config stpd hellotime 95 config stpd maxage 95 config stpd port cost 96 config stpd port priority 96 config stpd priority 95 config syslog 117 118 config time 38 config timezone 38 config vlan add po...

Страница 178: ...le snmp access 52 enable snmp traps 52 enable stpd 94 95 enable stpd port 95 enable syslog 117 118 enable telnet 39 49 enable web 39 51 125 H history 37 39 L logout 49 P ping 54 Q quit 49 R reboot 132 135 restart ports 57 S save 132 135 show access profile 44 45 show accounts 42 show banner 40 show configuration 135 show fdb 84 104 show fdb permanent 107 show igmp snooping 66 show iparp 50 show ip...

Страница 179: ...INDEX OF COMMANDS 179 U unconfig management 54 unconfig ports display string 56 unconfig stpd 97 unconfig switch 40 133 unconfig vlan ipaddress 79 use configuration 133 135 use image 132 135 ...

Страница 180: ...180 INDEX OF COMMANDS ...

Страница 181: ...except where the non compatibility is caused by a bug or defect in the third party s product or from use of the software product not in accordance with 3Com s published specifications or user manual THIS 3COM PRODUCT MAY INCLUDE OR BE BUNDLED WITH THIRD PARTY SOFTWARE THE USE OF WHICH IS GOVERNED BY A SEPARATE END USER LICENSE AGREEMENT THIS 3COM WARRANTY DOES NOT APPLY TO SUCH THIRD PARTY SOFTWAR...

Страница 182: ...NTIES EXCLUSIVE IF A 3COM PRODUCT DOES NOT OPERATE AS WARRANTED ABOVE CUSTOMER S SOLE REMEDY FOR BREACH OF THAT WARRANTY SHALL BE REPAIR REPLACEMENT OR REFUND OF THE PURCHASE PRICE PAID AT 3COM S OPTION TO THE FULL EXTENT ALLOWED BY LAW THE FOREGOING WARRANTIES AND REMEDIES ARE EXCLUSIVE AND ARE IN LIEU OF ALL OTHER WARRANTIES TERMS OR CONDITIONS EXPRESS OR IMPLIED EITHER IN FACT OR BY OPERATION O...

Страница 183: ...aws of the State of California U S A excluding its conflicts of laws principles and excluding the United Nations Convention on Contracts for the International Sale of Goods 3Com Corporation 5400 Bayfront Plaza P O Box 58145 Santa Clara CA 950542 8145 408 326 5000 ...

Страница 184: ...s Reorient the receiving antenna Relocate the equipment with respect to the receiver Move the equipment away from the receiver Plug the equipment into a 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 prepa...

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3Com 3C17705, Руководство пользователя

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Содержание 3C17705

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