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T

UTORIAL

2-12

2.5.2 N

ETWORK

L

OOPS

Assume that none of the stations on the network is active.

1.

Now, if Host X wants to send data to Workstation A, it puts a frame
containing the data on LAN A.

2.

Bridges 1 and 2 read the frame, note the fact that Host X is on their
local network (LAN A), and (not knowing where Workstation A is)
forward the frame on their respective links: bridge 1 sends the frame
to bridge 3; bridge 2 sends it to bridge 6.

3.

Bridge 3 reads the frame from the link, records the fact that Host X is
reached via its link and sends the frame to LAN B.

4.

Bridge 4 reads the frame from LAN B, notes that Host X is reached
via its LAN interface, and sends the frame to bridge 5.

5.

Bridges 5 and 6 read the frame off their own links, record the fact that
Host X can be reached via those links, and send the frame to LAN C.

6.

So Workstation A reads TWO identical frames for it from Host X.
The next step is even more important…

7.

Bridge 6 reads the frame placed on LAN C by bridge 5, and vice
versa. Both bridges (still not knowing where Workstation A is
located, as it has transmitted nothing yet) note that Host X is now on
LAN C, and send the frame on their links to bridges 2 and 4
respectively.

As this example shows, the network is unstable, as a loop exists which
causes all bridges to change their routing tables in error. The network
comes to a halt as all frames are duplicated and station locations continually
changed.

Network looping can occur with either local or remote bridges as shown in
Figure 2-6 below. Remote bridge pairs 1 and 3 and 4 and 5 in Figure 2-5
are replaced here by local bridges 1 and 3, but the connection paths are the
same.

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Содержание Marlin

Страница 1: ...ISSUE 3 0 MAN ML BRIDGE REF MARLIN BRIDGE REFERENCE MANUAL Issue 3 0 ...

Страница 2: ...ectronic medium or machine readable form without the prior written permission from Bay Networks The information contained in this manual is believed to be accurate however no responsibility is assumed by Bay Networks for its use nor for any infringements of patents or other rights of third parties resulting from its use All trademarks are acknowledged ...

Страница 3: ...ISSUE 3 0 MAN ML BRIDGE REF 1996 Scorpion Logic Ltd A Bay Networks company ...

Страница 4: ...Chapter 3 Network Examples A number of examples are used to explore different network configurations that may be used to meet specific user networking requirements It is likely that your network will closely match or is a variation of one of the examples given Chapter 4 Manager Operation All Nautica Series products conform to the same management system interface which is described in this chapter ...

Страница 5: ...l display output is in monospaced text e g STATUS NORMAL User input via an attached terminal is indicated by text in boldface with single key names being enclosed in angle brackets e g EDIT 4 RETURN When two or more keys are to be pressed simultaneously the convention of using a plus between characters is used e g CTRL E indicates that the control key should be held down while the E character is e...

Страница 6: ... 4 Network Recovery After Path Failure 2 15 2 6 The Integrated Services Digital Network ISDN 2 16 2 6 1 Overview 2 16 2 6 2 ISDN and LAN Bridging 2 17 2 7 Protocol Prioritisation 2 19 3 NETWORKING EXAMPLES 3 1 3 1 Point to Point Bridge Pair Networks 3 2 3 1 1 Bridge Pair with Single Link 3 2 3 1 2 Bridge Pair with Parallel Links 3 4 3 1 3 Bridge Pair with ISDN Backup 3 6 3 1 4 Bridge Pair with ISD...

Страница 7: ...ctivity Bar Graph Operation 4 7 4 3 Manager Terminal Operation 4 8 4 3 1 Screen Description 4 8 4 3 1 1 Title Line Region 4 9 4 3 1 2 Central Menu and Form Region 4 9 4 3 1 3 Menu Navigation Region 4 10 4 3 1 4 Command and Response Region 4 10 4 3 2 Menu Navigation 4 11 4 3 3 Form Navigation and Editing 4 13 4 4 Remote Terminal Management 4 15 4 5 Disconnecting from the Management System 4 16 4 6 ...

Страница 8: ... Calls 5 56 5 5 4 6 Calling Line Identification 5 60 5 5 4 7 TCP 32 WINS 5 61 5 5 5 SNMP Management 5 63 5 6 Status and Statistics Monitor 5 65 5 6 1 Ports Statistics 5 66 5 6 1 1 Ethernet Port Statistics 5 67 5 6 1 2 Serial Interface Statistics 5 69 5 6 2 Bridge Statistics 5 70 5 6 2 1 Link Spanning Tree Status 5 71 5 6 3 Spanning Tree Statistics 5 73 5 6 4 ISDN Call Statistics 5 75 5 6 4 1 ISDN ...

Страница 9: ...CONTENTS Section Page Issue 3 0 ix 6 8 Faultfinding TCP IP Networks 6 6 6 9 Faultfinding IPX Networks 6 7 6 10 Faultfinding Basic Rate ISDN 6 8 ...

Страница 10: ... with ISDN Backup 3 18 Figure 3 11 Cost Reduced ISDN Backup 3 20 Figure 3 12 Multi Tiered Network 3 22 Figure 3 13 Typical Bridge Network for ISDN Autocall 3 24 Figure 4 1 The Management Menu Tree System 4 2 Figure 4 2 Typical Front Panel Display 4 4 Figure 4 3 Front Panel Menu Navigation 4 5 Figure 4 4 Front Panel After Configuration Change 4 7 Figure 4 5 Interface Activity Bar Graph 4 7 Figure 4...

Страница 11: ... Screen 5 57 Figure 5 22 Add Edit ISDN Numbers Screen 5 57 Figure 5 23 ISDN CLI Screen 5 60 Figure 5 24 WINS Name Screen 5 61 Figure 5 25 Add Edit TCP 32 WINS Screen 5 62 Figure 5 26 SNMP Configuration Screen 5 63 Figure 5 27 Status and Statistics Menu Screen 5 65 Figure 5 28 Ports Statistics Screen 5 66 Figure 5 29 Ethernet Statistics Screen 5 67 Figure 5 30 Serial Interface Statistics Screen 5 6...

Страница 12: ... of Tables Page Issue 3 0 xi Table 4 1 Control Character Actions 4 18 Table 5 1 Common Ethernet Types 5 37 Table 5 2 Common IEEE Types 5 37 Table 6 1 Network Clearing Codes 6 4 Table 6 2 Internal Clearing Codes 6 5 ...

Страница 13: ...CONTENTS Issue 3 0 ...

Страница 14: ...GE Marlin Bridge is a high performance Ethernet Bridge providing a range of facilities and options to ensure networks can operate to optimum capacity Based on the latest RISC technology Marlin Bridge combines the features necessary to construct complex networks with the intelligence to provide plug and play easy installation Marlin Bridge is equipped with a single Ethernet LAN port and a single WA...

Страница 15: ...e cleared automatically in response to lower demand so keeping costs to a minimum Marlin Bridge has both ISDN and leased connections to ensure users can test network utilisation in real time over ISDN before committing to leased circuits Also as traffic patterns change leased circuits or ISDN may be added or removed at any site without needing to make equipment redundant 1 5 ISDN AUTOCALL BANDWIDT...

Страница 16: ...perating within minutes after connection to the network Marlin Bridge automatically learns all MAC addresses on the network and sets up the necessary tables Selection criteria can be specified using Manager Menus The built in management system can be accessed from the front panel via a Telnet call or from a connected ANSI terminal device The menu driven operation can be configured easily to meet n...

Страница 17: ...ls of access security which are invoked automatically and are transparent to the user Calling Line Identification CLI is supported which ensures incoming ISDN calling numbers are checked before access is allowed Marlin Bridge has a second layer of security based on the encoded MAC address of the calling bridge If this address is incorrect the remote unit will be unable to send or receive data ...

Страница 18: ...ded Load Sharing on Links including ISDN using Multilink Procedures Very High Performance RISC Processor Links can be fully utilised Sophisticated frame filtering at wire speeds so no loss of data Data Compression Effective throughput increase between 2 and 8 times typically 192Kbps from a 64Kbps channel Spanning Tree Algorithm IEEE Standard for multivendor interoperability Bridge Triangulation En...

Страница 19: ...stall one of the following optional expansion cards A dual BRI option card providing either one or two ISDN Basic Rate Interfaces a maximum of 3 BRI interfaces can be fitted to each Marlin A Primary Rate option card supporting EURO ISDN NET 5 iCTR4 compliant providing 30 B channels in Europe or 23 B channels in the USA The WAN4 serial port expansion option card provides four additional interfaces ...

Страница 20: ...access with no permanent link Dynamic channel allocation based upon bandwidth requirements Optional Primary Rate US Interface National ISDN Provides up to 23 B channels on one interface National ISDN NI 1 NI 2 compliant Use at central site for many to one dial in access with no permanent link Dynamic channel allocation based on bandwidth requirements Optional Quad WAN Port Expansion Board 1 to 4 W...

Страница 21: ...OVERVIEW 1 8 ...

Страница 22: ...d higher speeds are rapidly becoming available If more cabling is too costly techniques exist for using the existing cabling more efficiently However interconnecting such local networks at similar speeds over global distances would be too expensive due to the initial cost of installing the infrastructure for so much bandwidth It is therefore usual to interconnect local high speed networks using sl...

Страница 23: ...n information must be sent to several stations at once but as the number of stations increases the waiting time to send data on the network usually increases also Ethernet networks are limited to a maximum length of 500 metres when using Thick Ethernet cable 185 metres for Thin Ethernet cable also known as Cheapernet and 100 metres for 10BaseT UTP Unshielded Twisted Pair cabling There are also lim...

Страница 24: ...TUTORIAL 2 3 physically close then a local bridge can be used otherwise a remote bridge is used ...

Страница 25: ...egments can triple the network bandwidth which improves network performance by reducing transmission times and increasing overall throughput The total improvement depends on how much data passes between segments Fewer or more LAN segments may be used depending on what the network must do Any frames for stations on the same segment such as between Workstation A and Host X on LAN A need not be sent ...

Страница 26: ...hat station are forwarded to it by looking up the address in the bridge s address table to find the segment identification The bridge therefore uses the table it built up from the source addresses in frames it received to send other frames to destination addresses The bridge learns the location of a station as soon as the station sends its first frame2 The bridge or any other device on the LAN onl...

Страница 27: ...on is likely to reply to the station which sent that frame Various features can be built into local bridges to improve network performance and operation These include sophisticated frame filtering techniques so that only frames of certain types or belonging to certain workgroups are passed between segments Such features are described in more detail in the NETWORKING EXAMPLES section of this docume...

Страница 28: ...dge 2 The type of link between the segments depends on the wide area network services available at each of the remote bridge locations and how much the network administrator is willing to pay for those services Bridge 1 Bridge 2 LAN A LAN B Figure 2 3 Remote Bridging Each remote bridge sees the link to its partner bridge the partner bridge itself and the remote LAN as one LAN segment which usually...

Страница 29: ...ridges as shown in Figure 2 4 below Ignoring the link to bridge 2 for a moment bridge pairs 1 3 and 4 5 operate as described above with each bridge treating everything on its link as another LAN segment For example if bridge 3 reads a frame from LAN B then it will conclude that the source of that frame can be reached via its LAN B interface The frame may actually come from a station on LAN D and a...

Страница 30: ...TUTORIAL 2 9 Figure 2 4 Multiple Remote Bridges ...

Страница 31: ...LAN segment When seen in this way bridge 1 performs in the same way as the local bridge shown in Figure 2 2 Frames arriving on one of bridge 1 s links will be treated as if they arrived on its LAN interface If the destination address is reached via the other link then the data will be sent directly down that link It is not placed on bridge 1 s LAN interface Therefore frames passing between LAN B a...

Страница 32: ...om link and bridge failures the connection between the LANs will be broken on both sides of the point of failure A more resilient failure tolerant network of interconnected LANs can be set up as shown in Figure 2 5 by providing more than one physical path between any two of the LANs However this network would soon have serious problems if precautions were not taken by the bridges The problems and ...

Страница 33: ... own links record the fact that Host X can be reached via those links and send the frame to LAN C 6 So Workstation A reads TWO identical frames for it from Host X The next step is even more important 7 Bridge 6 reads the frame placed on LAN C by bridge 5 and vice versa Both bridges still not knowing where Workstation A is located as it has transmitted nothing yet note that Host X is now on LAN C a...

Страница 34: ...dvantage that a more resilient failure tolerant network can be built The disadvantage is that some links and potentially usable bandwidth may be idle for long periods of time Later we will see how this bandwidth can be used while allowing STA to resolve loops STA uses a number of factors derived from network bridges and their links Bridge Address The standard MAC Medium Access Control layer addres...

Страница 35: ...link 1000 0 065 15 625 Port Priority The Port Priority is used to choose between ports on the same bridge with the same Path Cost The port with the lowest Port Priority value has the highest priority If two or more ports have the same Port Priority the port with the lowest Port No or Port Identifier is given the highest priority The STA specifies a single path from any bridge on the network to a R...

Страница 36: ...t replaces the previous one 4 If the BPDU priority is lower the BPDU is ignored and discarded by the receiving bridge Here bridges 2 and 3 ignore and discard BPDUs from bridge 4 which have a higher address and therefore a lower priority when Bridge Priority is the same In the same way bridge 1 ignores and discards BPDUs from bridges 2 and 3 5 BPDUs from bridge 1 are accepted by all bridges as it h...

Страница 37: ...the BPDU and adds 100 the Path Cost of LAN C between bridge 4 and bridge 3 back to the root to the received Path Cost making a total of 200 9 Since the cost of the path via bridge 3 is lower bridge 4 chooses this path as the primary and the link via bridge 2 as the secondary The port connected to LAN C becomes the Designated Port for bridge 4 Bridges 2 and 3 perform similar processes to choose the...

Страница 38: ...TUTORIAL 2 17 In any case STA resolves the paths to allow the network to operate satisfactorily ...

Страница 39: ...llo BPDUs and a similar process to that described for the network start up will be repeated to find a new unique path through the network When a bridge detects or causes a change in the network it should inform other bridges For example if a bridge can no longer access some of its ports then it may not be able to send or receive frames Also if the bridge receives a BPDU from the Root Bridge at a p...

Страница 40: ...wo 64 Kbps B channels and one 16 Kbps D channel EURO ISDN is a pan European standard which replaces existing national ISDN standards French and German EURO ISDN networks differ slightly from this standard the Nautica series is approved for attachment to both of these and for standard EURO ISDN The North American ISDN Basic Rate Interface has two 64 Kbps B channels 56 Kbps for long distances depend...

Страница 41: ...lower speed links can be used but usually only when usage is low and infrequent or higher speed circuits cannot be provided Leased digital point to point circuits still offer the most cost effective interconnection medium for remote bridging if usage spans a number of hours however this may change as ISDN tariffs are reduced ISDN can be used to provide effective backup of these point to point circ...

Страница 42: ... into service So when an ISDN connection is set up STA will recognise the change and start a network topology change process to include the new connection in its calculations Note when using ISDN care is needed to ensure that connections are not continually being set up and cleared as this causes poor performance because STA is forced to recalculate the network In some cases the network may become...

Страница 43: ...r any other protocols transported by the bridge This ensures that one or more user data streams are not slowed down by other data streams that take a lot of bandwidth In addition Bandwidth on Demand and or Backup can be allocated to either EXPEDITED or NON expedited normal data Please see the following menu screens and forms 1 TYPE FILTERS command CONF BRID TYPE 2 FILTER PARAMETERS command CONF BR...

Страница 44: ...ackup when the leased circuit can be used again normal NON expedited data is switched to it automatically the ISDN calls are then cleared when data traffic is less than the Idle Threshold Note Expedited Protocols can be used without Bandwidth on Demand or Backup To configure a bridge for Expedited Protocols do these steps in the order shown Use the command CONF BRID TYPE to set up a Type Filter ta...

Страница 45: ...XPEDITED data will be carried by the first additional ISDN channel that is dialled up on demand EXP BKUP does the same as EXP DATA It also allows an ISDN call to be made to backup the leased circuit if it fails NON EXP DATA means that when demand thresholds are reached NON expedited data will be carried by the first additional ISDN channel NON EXP BKUP does the same as NON EXP DATA It also allows ...

Страница 46: ...TUTORIAL 2 25 ...

Страница 47: ...b product but all of the examples can be built with a combination of Marlin Bridge and other Nautica bridge units or with some of the Marlin Bridge units fitted with optional expansion cards Each example is described using a common format so that differences between them can be assessed quickly and the examples most relevant to your installation used as models Each example has the following format...

Страница 48: ...E PAIR NETWORKS Bridge Pair with Single Link Bridge Pair with Parallel Links Bridge Pair with ISDN Backup Bridge Pair with ISDN Interconnect Only 3 1 1 BRIDGE PAIR WITH SINGLE LINK Bridge A Bridge B LAN 1 LAN 2 Figure 3 1 Bridge Pair with Single Link ...

Страница 49: ...AN will be transmitted on the serial link between the two bridges Data can be transported between LANs with no filtering out of frames based on addresses or protocol type Installation The bridge hardware should be set up as in the Installation Guide If the default Standard Configuration is used no other changes are required unless optional bridge features are needed For instance to use the remote ...

Страница 50: ...c levels are very high and keeping network delays to a minimum is important If one link fails the other one will continue without loss of data but network performance may be lower if the traffic level is greater than one link can ideally support Operation When two bridges are connected in this way they will detect automatically that they have multiple parallel links and will ensure that frames pas...

Страница 51: ...nfiguration is used no other changes are required unless optional bridge features are needed This is a simple extension to the SINGLE LINK bridge pair using the default Standard Configuration No configuration changes are needed to set up this network More than two links may be connected in parallel if a WAN4 port expansion card is used Optimisation Both links must operate at the same effective thr...

Страница 52: ...he leased line reaches a loading threshold and also for circuit backup in the event of a link failure Depending on distance time and other factors using ISDN offers significant cost savings over permanent leased lines Operation Bridges pass frames of data between the two LANs using the leased line circuit as in the SINGLE LINK example more than one leased line can be used if traffic levels demand ...

Страница 53: ...ridges set up an ISDN connection between themselves and continue operation using this channel until the primary circuit is restored Then the ISDN channel is closed unless it must stay open to meet link threshold requirements Installation This network is based on the default Standard Configuration Several parameters must be set up and at least one ISDN Option Card fitted to the bridges For each bri...

Страница 54: ...between the two bridges the high costs of permanent leased lines are reduced This network is not restricted to a pair of bridges only Special handling of MAC addresses and specific protocols IP IPX ScaNet OSI Banyan Vines enables a network of ISDN only connected bridges to be built and operated This is very useful for occasional remote site users who dial up various hosts and central sites which i...

Страница 55: ...front panel and or management terminal A list of configured destination Marlin Bridges and their ISDN numbers is presented from which the required destination can be selected Normally the procedure would be carried out just before sending data between the local and destination LANs Installation As in the example BRIDGE PAIR WITH ISDN BACKUP the ISDN dial up numbers of partner bridges must be defin...

Страница 56: ...at the remote unit is calling from the expected number CLI is an option from the ISDN provider and must be present for the bridge CLI feature to operate When the ISDN numbers of the remote units are added to the CLI table the Marlin Bridge will only accept incoming calls from these numbers see REFERENCE chapter section 5 5 4 6 Calling Line Identification ...

Страница 57: ...twork server or mainframe LAN 1 and LAN 3 are remote offices or departments that need access to the central database The network consists of two simple bridge pairs with only one path from each LAN to the other If bridges A and B were the original bridges as in the SINGLE LINK example then it is easy to install bridges C and D they will function as part of the network without reconfiguring bridges...

Страница 58: ...bridge B which gives the frame to LAN 2 Bridge C sees that the frame is for a LAN 3 device and sends it on its serial link to bridge D Installation This network is a simple extension of the SINGLE LINK example The same default configuration can be used if enhanced bridge features are not needed Optimisation ISDN and permanent parallel links can provide network resilience and extra bandwidth see pr...

Страница 59: ...he network types shown below are discussed in this section Simple Bridge Triangulation Multiple Bridge Triangulation Bridge Triangulation with Resilient Links Fully Resilient Network Triangulation Fully Resilient Network with ISDN Backup Cost Reduced ISDN Backup ...

Страница 60: ...ls via LAN 2 so better performance on LAN 2 is achieved This is called a Triangulated Network Operation Bridge B acts as the remote bridge for both bridges A and D and appears to them to be a partner bridge as in the BRIDGE PAIR WITH PARALLEL LINKS example Bridge B now functions as two bridges bridges B and C from the previous example MULTIPLE BRIDGE PAIRS but with the extra work of routing frames...

Страница 61: ... for every link so keeping costs to a minimum Operation Bridges A B and D all act as triangulated bridges while bridges E and F are configured normally The triangulated bridges handle their serial links in a similar manner to the LAN port making decisions about which serial or LAN interface to use for sending data to its destination Note if intermediate links or bridges fail then inter LAN communi...

Страница 62: ... around the network If either active link fails the STA makes the standby link active and allows frames to be sent on it This ensures that data can still be routed to all LAN devices on the network Note this network is not resilient to bridge failures e g if bridge B failed then frames could pass between LAN 1 and LAN 3 but could not be sent to or received from LAN 2 as it would be isolated comple...

Страница 63: ...or a bridge fails Operation Extends the MULTIPLE BRIDGE PAIRS example which interconnects three LANs using two independent bridge pairs Two extra bridges are added to the network to interconnect LAN 1 and LAN 3 This network operates in much the same way as the previous BRIDGE TRIANGULATION WITH RESILIENT LINKS example where the STA disables one link to remove the network loop If any one connection...

Страница 64: ...resilience is improved as any leased line failures can be backed up by dialled up ISDN circuits and bandwidth utilisation can be optimised by using ISDN circuits only when network traffic reaches defined threshold levels Each bridge has an ISDN Option Card to provide bandwidth on demand and connections to all other bridges Operation For each bridge basic operation is almost identical to that descr...

Страница 65: ...Backup Demand Mode must be set for bandwidth on demand and or backup ISDN parameters such as threshold levels should also be set if needed The two bridges on LAN 2 can be connected to the same ISDN line using the facility which allows up to eight devices bridges in this case to be attached to one Basic Rate line this reduces the total number of channels available ...

Страница 66: ...n on each LAN In this way bridges on a LAN can share ISDN interfaces to reduce the overall cost This is most useful when ISDN is being used for backup rather than for bandwidth on demand Operation When the leased line between bridges E and F fails bridge E asks bridge A to make an ISDN connection by giving it the ISDN number of the remote bridge F When the connection is made and the STA has resolv...

Страница 67: ...r backup are set up with the MAC address of the bridge bridge A and the ISDN number of the remote bridge to be dialled if their leased lines fail bridge F see REFERENCE chapter section 5 5 2 2 HDLC Ports To improve network security each bridge s authorisation table must contain the MAC address of every other bridge which is allowed to call that bridge When this is done a bridge will not accept ISD...

Страница 68: ...e failure tolerance can be built into parts of the network essential for business operations smaller remote sites could be given a lower cost but less resilient service Operation This is relatively simple STA resolves all routing issues especially around the backbone where resilient links are most likely STA ensures that only a single path exists between any bridge and the root bridge so removing ...

Страница 69: ...e given the highest priority STA can calculate a suitable topology Optimisation In more complex networks than this one it is important to ensure that STA sets up a suitable root bridge and an efficient root primary path In this case bridge priorities can be set manually to help STA to set up a better path than it would by using bridge addresses as the default priorities The remote bridges on spurs...

Страница 70: ...dge Network for ISDN Autocall Marlin Bridge Autocalls make and control connections between Ethernet LANs when only ISDN is available The Marlin Bridge can interpret a number of different protocols to find out when it should set up and close down ISDN connections The Marlin Bridge can spoof mimic or emulate some devices to reduce ISDN connection times improve ISDN utilisation and save costs Each pr...

Страница 71: ...al up connection has been made to carry out the request If the address has already been resolved but the ISDN line has been dropped for example if there was no traffic for 2 minutes a subsequent IP packet will make the line active again Installation Add an entry to the ISDN Autocall table of the Marlin Bridge for an IP address specific host destination an IP subnet group of hosts or an inverse sub...

Страница 72: ...tion Autocall table setup is made much shorter and simpler by first setting up manual ISDN calls between remote client site s and the central server site s and or between server sites This allows the Marlin Bridges to learn the locations of servers and routers on the network see REFERENCE chapter section 5 5 4 2 ISDN Automatic Call Addresses Unasked for information from servers can be used to star...

Страница 73: ... 5 BANYAN AUTOCALLS Operation For networks running Banyan Vines the Marlin Bridge can be set up to learn the structure of the Banyan network and can emulate the remote network when the link is down The call will be set up only when real data is being sent Installation Create a single Autocall table entry of type Ban_def which specifies the destination to be called when a Workstation begins a new s...

Страница 74: ...NETWORKING EXAMPLES 3 28 ...

Страница 75: ...P MIB II standards A default configuration can be selected at the time of installation to provide some possibly all of the parameters needed for a given network If a local management terminal is not available enough parameters can be set from the front panel to allow access from a remote management station or a terminal connected to another Nautica Series Bridge Depending on the product type littl...

Страница 76: ...d in forms built up and edited from a number of items Figure 4 1 shows the general relationship between the menu tree and forms Some management system options may not be available via the front panel of the product such as the shaded items shown here MAIN MENU SUB MENU SUB MENU SUB MENU SUB MENU SUB MENU SUB MENU SUB MENU SUB MENU FORM FORM SUB MENU FORM FORM 1 2 3 4 5 11 31 51 52 Figure 4 1 The M...

Страница 77: ...mation Forms provide the user with one or more pages of information which contain static fixed and dynamic changing information as well as fields that can be edited Items or fields on a form can contain free format unconstrained text or a fixed format constrained list Free format text is any text the user wants to enter although most free format text fields will check any text input by using certa...

Страница 78: ...formed More information about management menus forms and status displays is given later in this chapter 4 2 2 MENU NAVIGATION VIA THE FRONT PANEL Normally the front panel window shows the Marlin Bridge s interface loading bar graph which gives a quick indication of the loading on external interfaces If more information is needed or to change a parameter then move the window down the menu tree to t...

Страница 79: ... First item selected Visible Area CALLS QUIT NAME IPADDR M MACADDR DATE ENTER key moves to the CONFIGuration menu DATE TIME ST View if DOWN key were pressed to select CALLS Views if DOWN key were pressed successively PROD London CONFIG London CONFIG London CONFIG London CONFIG London Figure 4 3 Front Panel Menu Navigation At the top level menu if the DOWN key is pressed instead of the ENTER key th...

Страница 80: ...keys until the required value is shown then pressing the ENTER key No other values are allowed If a field is numeric decimal digits 0 to 9 are displayed If it is hexadecimal digits 0 to 9 and letters A to F are displayed If it is alphanumeric letters A to Z digits 0 to 9 and punctuation marks or special characters are displayed Use the ENTER key to move the cursor from one character to the next in...

Страница 81: ...d i e in square brackets When the current configuration is SAVEd the SAVE option will not be shown 4 2 5 INTERFACE ACTIVITY BAR GRAPH OPERATION Normally the front panel shows the interface activity bar graph The display shows each interface LAN1 WAN1 etc for two seconds as in Figure 4 5 LAN1 T R Figure 4 5 Interface Activity Bar Graph The bar graph shows the level of Transmit T and Receive R activ...

Страница 82: ...MANAGER OPERATION 4 8 To leave the interface activity bar graph mode press any key other than UP and the display returns to the top level menu ...

Страница 83: ...d forms is almost identical Both formats have similar features and the same screen regions 4 3 1 SCREEN DESCRIPTION Figure 4 6 shows the screen regions for menus and forms described below PRODUCT NAME VERSION SCREEN TITLE ________________________________________________________________________________ CENTRAL SCREEN REGION CONTAINS A MENU OR FORM AND SCREEN SPECIFIC COMMANDS ______________________...

Страница 84: ...he right menu Form Name Choosing this item asks the management system to display the named form and the information it contains Each item has a short description of its function Command Name A command that causes a management action to be taken depending on which command was entered the state of the unit and the current unit configuration1 List Item If there is more than one item of the same type ...

Страница 85: ...control characters and actions at the end of this chapter 4 3 1 4 Command and Response Region This region shows command input and system responses to those commands It is not used on forms where input is entered directly into the central region Command Line Displays commands typed by the user More than one command at a time can be entered using the system s type ahead facility The command or comma...

Страница 86: ...connect ________________________________________________________________________________ G Main menu L Prev menu ________________________________________________________________________________ Enter command Figure 4 7 Main Menu Example Shorter item names can be used if the shorter name is still unique to the menu system where it is entered e g REM does the same as typing REMOTE See REFERENCE chap...

Страница 87: ...________________________________________________________________ co po Enter command Figure 4 8 Variable List Menu Example When a menu list such as this one has a variable number of items the item required is selected as follows One way is to use the keyboard cursor up and down keys to move through the list until the item is between the square brackets at the beginning and end of the line Also the...

Страница 88: ...RAL_SITE ________________________________________________________________________________ G Main Menu E Submit L Prev Menu ________________________________________________________________________________ Figure 4 9 HDLC Port Configuration Form Example When a form is shown on the screen the cursor is set to the first field that can be edited it can be moved to other fields using the and and cursor ...

Страница 89: ...ake the changes exit the form and return to the previous screen Note parameters are changed as soon as a new value is entered Some changes e g link operating parameters may cause the network to stop working Such major changes should be made only after closing the network when network traffic is low or after warning network users of potential problems When system information is changed it must be s...

Страница 90: ...Marlin Bridge and displayed by typing REM RETURN to show a list like that in Figure 4 10 below No management system changes are needed except to add the names and IP addresses of the Marlin Bridges on the network N MAR mmm SYSTEM NAME REMOTE UNITS ________________________________________________________________________________ Page No m of n Unit Name IP Address MAC Address LONDON 123 123 123 123 ...

Страница 91: ...h TCP IP Telnet protocol including Terminal Servers PCs with suitable emulation software or another Marlin Bridge or compatible unit When a connection to the local unit s management system is made then management from a remote network attached terminal PC emulating a terminal or remote unit is the same as using a local management terminal 4 5 DISCONNECTING FROM THE MANAGEMENT SYSTEM If logged on t...

Страница 92: ...rd as follows Enter Password PASSWORD RETURN Here the user has entered the default value PASSWORD Change this password to a more secure and private one as soon as the unit is installed 4 8 CONTROL CHARACTERS IN TEXT STRINGS To enter control characters into text string fields each one must start with the caret character The two character combination of caret and alphabetic character is translated i...

Страница 93: ...H None Backspace in field deleting characters I None Same as TAB character L Go to previous screen Leave the form and go to the previous menu without saving any changes M Typed command line text will be submitted for processing Move to the next field N In a multi page form moves to the next page If on the last page will move to the first page None R Recall the last command entered Recall the last ...

Страница 94: ...ion of those parameters The general layout of the screen screen regions keyboard usage and front panel operation are described in the MANAGER OPERATION chapter The management options available via the Marlin Bridge s front panel are not as comprehensive as those via a terminal interface They do however enable the Marlin Bridge to be configured such that it can become operational This chapter inclu...

Страница 95: ...rmation can be found is also given in the menu tree below indicates that the item is a configurable data item on a form MAIN MENU 5 8 Configuration CONF 5 9 System Management CONF SYS 5 10 Date 5 10 Time 5 10 Password 5 10 Idle Timeout 5 11 LCD Manager Lock 5 11 Unit Name 5 11 Unit IP Address 5 11 Ethernet MAC Address 5 12 Node ID 5 12 Default ISDN Alert 5 12 Receive ISDN Alert 5 12 Time Since Reb...

Страница 96: ...th on Demand Priority 5 24 Backup Priority 5 24 Backup Alert 5 25 Number 5 27 Name 5 27 STP Priority 5 28 Line Speed 5 28 Data Compression 5 28 Dial Timeout 5 28 ATZ String 5 29 Demand 5 29 Bandwidth on Demand Threshold 5 29 Bandwidth on Demand Threshold Dial up Period 5 29 Idle Threshold 5 30 Bandwidth on Demand Clear Down Period 5 30 Demand Priority 5 30 Subaddress 5 31 SPID 5 31 Local Number 5 ...

Страница 97: ...n On Match 5 47 Filter Multicast Enable 5 47 Type Matching Enable 5 47 Unmatched Type Action 5 48 Learn SRC on Multicast Enable 5 48 Learn Novell RIP Addresses 5 48 Learn Banyan 5 49 Strip Novell RIP SAP 5 49 pcANYWHERE over IPX 5 49 MS WINS Server 5 49 ISDN Configuration CONF ISDN 5 50 Bridge Authorisation CONF ISDN AUTH 5 52 Other Bridge Address 5 53 ISDN Automatic Call Addresses CONF ISDN AUTO ...

Страница 98: ...Mo 5 70 ISDN Calling Line Identification CONF ISDN CLI 5 72 TCP 32 WINS CONF ISDN WINS 5 73 Service Name 5 74 Description 5 74 IP Address 5 74 Group Address 5 74 Entry Type 5 74 SNMP Management CONF SNMP 5 76 Product Version Number 5 77 Product Description 5 77 Unit Name 5 77 Contact Name 5 77 Location of Unit 5 77 Public Community Password 5 77 Private Community Password 5 78 Remote Trap Address ...

Страница 99: ... STAT ISDN 5 89 ISDN Call History STAT ISDN HIST 5 90 Hublet Statistics STAT HUBL 5 91 TCP IP Statistics STAT TCP IP 5 92 Connect To Remote Device REM 5 93 Name of the Remote Unit 5 94 IP Address of Remote Unit 5 94 MAC Address of Remote Unit 5 94 Connect to Remote Unit 5 94 ...

Страница 100: ...ould be selected to take you to that item The items all have direct equivalents in the terminal management system and the page number reference indicates where more information about the item can be found in the menu tree indicates that the item is a data item on a form and indicates a menu item Save Current Configuration SAVE See MANAGER OPERATION Configuration CONFIG Unit Name NAME 5 11 Unit IP ...

Страница 101: ..._________________________________________ Enter command Figure 5 1 Main Menu Screen CONF Provides access to the configuration facilities within the management system STATS Gives access to the status and statistical information maintained by the unit REMOTE Accesses the Remote Connect feature allowing you to connect to other TCP IP Telnet devices on the network QUIT This will close down the current...

Страница 102: ...________________________________ co Enter command Figure 5 2 Configuration Menu Screen STD Resets the Marlin Bridge s current configuration back to the default factory settings If you select this menu item you will be asked to confirm that you want the change to take place ERASE Y N The Marlin Bridge will reboot automatically after this command SYSTEM Selects the common parameters found on all pro...

Страница 103: ... Menu ________________________________________________________________________________ Figure 5 3 System Parameter Form DATE TIME The Date and Time can be changed by entering the date or time Submit the form CTRL E at the instant the time is correct for accurate setting OLD PASSWORD When changing the password the current password must first be entered in this field This will not be printed when ty...

Страница 104: ...ver the network ETHERNET ADDRESS This is the unit s unique base Ethernet address which is configured into the unit hardware at the time of manufacture and cannot be changed manually NODE ID Applies only to the C Gate DCX gateway product DEF ISDN ALERT When making ISDN calls this controls the default handling of the front panel alert LED and audible alert Used when making ISDN calls where there is ...

Страница 105: ...REFERENCE 5 12 TIME SINCE REBOOT This is the time in hours mins secs since the Marlin Bridge was last rebooted ...

Страница 106: ...__________________________________________________________ co po Enter command Figure 5 4 Ports List Screen This screen provides an overview of the current operational status of the ports on the system as well as enabling a port to be selected for configuration editing The port currently selected is highlighted and in square brackets The information presented on this screen is briefly described wi...

Страница 107: ...pe of port is not the hardware type but is related to it For any particular physical hardware port there may be a number of types that are applicable The TYPE command is only available on this screen if the port type can be changed For example the wide area port on the motherboard can be configured to be HDLC PPP or TA so the TYPE option will be available The Ethernet port however has its type set...

Страница 108: ...t performance can be found later in this chapter under STATISTICS LZC Provides an indication of the current compression ratio being achieved on the links when Lempel Ziv data compression is enabled STATE Indicates the current state of the port The state will be DOWN if the port is being reconfigured Note a link configured as BRIDGE PPP will not indicate a state ...

Страница 109: ... 5 5 LAN Port Configuration Form PORT NUMBER The port number in the system It is generated automatically by the system and cannot be configured PORT NAME A name given to the port for ease of reference STP PRIORITY Used by the Spanning Tree Algorithm to help determine which root port to use when calculating the root path The lower the number the higher the priority See TUTORIAL chapter for examples...

Страница 110: ...nu ________________________________________________________________________________ Figure 5 6 HDLC Port Configuration Form PORT NUMBER The port number in the system It is generated automatically by the system and cannot be configured PORT NAME A name given to the port for ease of reference It is not used by the system other than on management screens STP PRIORITY Used by the Spanning Tree Algorit...

Страница 111: ...should monitor the effect of turning compression on and off particularly at line speeds over 256Kbps BACKUP DEMAND MODE Specifies if Backup of this port and or Bandwidth on Demand is allowed when dial up ports are available e g ISDN Also specifies if EXPEDITED or NON expedited data will cause the system to dial up Backup and or Bandwidth on Demand when threshold values are reached see TUTORIAL cha...

Страница 112: ...ll be sent by the first additional link dialled up NON EXP BKUP means that when Demand Threshold values are met see below packets defined as NON expedited in the Type Filter Table will be sent by the first additional link dialled up It also allows the use of the BACKUP facility to dial the Remote Unit Name destination see below if the usual link fails REMOTE UNIT NAME The name or ISDN number of th...

Страница 113: ... bandwidth will not be dialled up due to these frame types DEMAND PERIOD The period in seconds over which bandwidth utilisation is measured to determine whether the Demand Threshold has been exceeded Over the Demand Period more than Demand Threshold percent of the link bandwidth must have been used before additional bandwidth if available will be dialled up IDLE THRESHOLD If the loading on a diall...

Страница 114: ...sed by a higher priority request the new request will be refused If it is lower the dial up circuit will be cleared and used for the new request The original port may have requested the backup circuit for backup or for additional bandwidth Therefore it is possible to establish a priority hierarchy for ports which may be using backup circuits for either reason The higher the number the higher the p...

Страница 115: ...udible warning is given as well as the visible indication This warning is issued each time the ISDN channel status is displayed on the front panel LCD display approximately once every 10 20 seconds depending on the number of ports configured ...

Страница 116: ..._____________________________________________________________ Figure 5 7 PPP Port Configuration Form Please refer to the HDLC Ports screen and parameter descriptions above for details PPP should be used on high speed links where the simplicity of the protocol particularly the fact that acknowledgements are not required enables higher data throughput to be achieved than by using HDLC Note you canno...

Страница 117: ...t L Prev Menu ________________________________________________________________________________ Figure 5 8 TA Port Configuration Form Note for units fitted with Euro ISDN interface modules the parameters SPID LOCAL NUMBER and SWITCH TYPE described below are not displayed and have no effect PORT NUMBER The port number in the system It is generated automatically by the system and cannot be configured...

Страница 118: ...he effect of turning compression on and off DIAL TIMEOUT The time that the bridge allows between making a request for a destination and expecting a response back For local calls 10 seconds would be adequate but for international calls this may need to be extended ATZ STRING When a call is dropped the bridge sends this string to re initialise the TA Leave this as AT M for the internal TA DEMAND All...

Страница 119: ... present IDLE PERIOD The period in seconds over which link loading is calculated for comparison with the Idle Threshold Over the Idle Period if less than Idle Threshold percent of the link bandwidth has been used the dialled up link is cleared down An Idle Period that is too short may cause connections to be dialled up and cleared before operation has stabilised while setting a value that is too h...

Страница 120: ...d not be set See the booklet Ordering and Configuring for North American ISDN Services for more details default none LOCAL NUMBER The local directory number assigned by the telephone company should be entered here only if ISDN interface modules with North American ISDN support are installed With certain switch configurations this parameter need not be set See the booklet Ordering and Configuring f...

Страница 121: ...when there is no call in progress to SYNC when a call is established When in ASYNC the TA must understand Hayes AT commands Command Echo should be switched OFF ATE0 When the Marlin Bridge drops its READY signal any call in progress should be dropped and the TA should return to ASYNC When the TA has a call established it should raise its READY signal The TA should not automatically answer incoming ...

Страница 122: ...arameters _________________________________________________________________________________ G Main Menu L Prev Menu ________________________________________________________________________________ co br Enter command Figure 5 9 Bridge Configuration Screen STP Access the configurable Spanning Tree parameters form ADDRESS Display the address filter table and access filter table commands TYPE Specify...

Страница 123: ..._________________________________________________ Protocol NONE Hello Time secs 2 Maximum Age secs 20 Bridge Priority 32768 Forward Delay secs 15 ________________________________________________________________________________ G Main Menu E Submit L Prev Menu ________________________________________________________________________________ Figure 5 10 Spanning Tree Configuration Screen Note it is n...

Страница 124: ... in seconds of a packet which if received will still be treated as containing valid information BRIDGE PRIORITY Helps to decide which bridge in the network will become the Root Bridge If bridges have equal priorities then their MAC addresses are used to decide priority FORWARD DELAY Defines how many seconds the bridge will delay before forwarding frames following a network topology change It is im...

Страница 125: ...r table but can be ignored N MAR mmm SYSTEM NAME ADDRESS FILTER TABLE ________________________________________________________________________________ Page No n of m Type Destination Source Route Pkts Bytes P 00C0C2000000 567654467899 1 123 P 007654467899 00C0C2000000 TCP IP 12 1234 P NYMktDept UKMktDept NewYork 123 12345 P UKMktDept NYMktDept MktDept 1234 123456 L 004345677687 004729927439 12345 ...

Страница 126: ...aken when a match is or is not found is determined by the Action on Match parameter see Filter Table Parameters below Note for the purpose of displaying the Address Filter Table each pair of stations source and destination will have two entries in the table one for a station acting as a source and the other for it acting as a destination SOURCE The source MAC address or name See notes for Destinat...

Страница 127: ... The page number and the total number of pages of entries is displayed in the upper right of the screen CTRL N and CTRL B The two control keys move the display to the next and previous pages respectively ADd Add an entry to the filter table This command will take you to a form see below which allows Permanent entries to be configured manually DELete param Allows entries in the filter table to be d...

Страница 128: ...making certain entries PERMANENT as explained above If no parameters are given with the command the entry under the cursor will be deleted from the table but only if it is a Learned entry A parameter can select the addresses to be flushed FLU 1234 flushes all addresses beginning with 1234 FLU deletes all Learned entries from the table CLear param Clears the current statistics counts If no paramete...

Страница 129: ..._____ Destination 003456789012 Source 008765432109 ________________________________________________________________________________ G Main Menu E Submit L Prev Menu ________________________________________________________________________________ Figure 5 12 Add Entry to Filter Table Form DESTINATION Destination MAC address The Nautica series Bridge unit name can be used instead SOURCE Source MAC a...

Страница 130: ...____________________________________ co br ty Enter command Figure 5 13 Type Filters Screen FORMAT Filter format IEEE 802 2 or Ethernet 2 DIX TYPE If Format is IEEE Type is checked against the DSAP of incoming packets 1 octet If Format is Ethernet Type is checked against the Ethernet type of incoming packets 2 octets See tables below for lists of common Types ACTION ON MATCH Action on Match is per...

Страница 131: ...003 DEC DECNET Phase IV Route 6004 DEC LAT 6005 DEC Diagnostic Protocol 6006 DEC Customer Protocol 6007 DEC LAVC SCA 6010 6014 3Com Corporation 80F2 Retix 8137 8138 Novell Inc 814C SNMP FAF5 Infinite Networking Protocol Table 5 1 Common Ethernet Types Type Hex Description AA IEEE 802 2 SNAP BC Banyan Vines E0 Novell IPX 802 2 FE ISO DIS 8473 FF Global DSAP broadcast Table 5 2 Common IEEE Types ...

Страница 132: ..._________________________________________________________ Figure 5 14 Bridge General Parameters Entry Form AGEING TIME Determines how long an entry remains in the filter table after frames cease to be passed between the source and destination This ensures that the table is not filled up with entries that are no longer in use If setting this time do not set it too short as entries may be removed to...

Страница 133: ...lace and such frames will be forwarded to all valid ports If ENABLE is set Multicast frames will be rejected unless they are configured as Permanent entries in the Address Filter table Note This may stop some protocols from working TYPE MATCHING Specifies if type matching is performed on entries in the Type Filter table ENABLEd allows type matching DISABLEd means that no type matching is performed...

Страница 134: ...Netware servers on the network from the Multicast and Broadcast packets they generate Each Novell protocol is treated independently If ENABLE is set information learned is added to the Autocall Table see below If DISABLEd no learning takes place Learn Banyan ENABLE allows the bridge to learn the Banyan Vines network topology and add router and server information to the Autocall table STRIP Novell ...

Страница 135: ...REFERENCE 5 42 MS WINS Server ENABLE means that the bridge acts as a local Windows for Workgroups Name server running TCP IP protocol ...

Страница 136: ...________________________________________ co isdn Enter command Figure 5 15 ISDN Configuration Screen AUTHORISE Authorise Remote Bridges to connect to this Marlin Bridge AUTOCALL Address to ISDN Number mapping for making ISDN calls automatically based on traffic content Useful for links with no permanent connection BANDS Set up and edit ISDN time bands For allowing or blocking ISDN calls based on t...

Страница 137: ...DN numbers authorised to dial into this Marlin Bridge Your PTT supplier can provide the ISDN number of the calling unit which the Marlin Bridge uses to enable or disable access WINS Show edit add or delete entries in the list of MS Windows servers on the network supporting the TCP 32 protocol ...

Страница 138: ...st N MAR mmm SYSTEM NAME BRIDGES AUTHORISED TO JOIN NETWORK ________________________________________________________________________________ Page No n of m No Address 1 003456789012 2 004567890123 3 005678901234 ADD xxxxxxxxxxxx Add bridge DELETE Delete bridge ________________________________________________________________________________ N Next Page G Main Menu B Previous Page L Prev Menu ______...

Страница 139: ...ng the large majority of users 802 3 Ethernet 2 or 802 2 Novell IPX protocol support provides protocol spoofing of certain packet types autocalls to establish connections when necessary and semi automated self configuration and learning mechanisms to help with the initial setup of the Autocall Table Typically this feature enables ISDN only connected LANs to communicate This is especially useful fo...

Страница 140: ... network 6 Close the ISDN connection 7 Repeat steps 4 to 6 for each pair of Nautica series Bridges which are to communicate using ISDN 8 SAVE the Configuration If more Nautica series Bridges are added to the network later follow the same procedure as above It is important to configure unit names and ISDN numbers before Learn Novell is ENABLEd If the Nautica series Bridge is to respond to get neare...

Страница 141: ...ning mechanisms to help with the initial setup of the Autocall table To configure Banyan Vines Autocalling Spoofing first set up the ISDN Numbers table to contain the numbers and names of all the remote bridges which are likely to be called at any time Add an Autocall entry for type BANYANDEF Banyan Default Connection This entry only requires the name of the default Nautica series Bridge to call a...

Страница 142: ..._______ N Next Page G Main Menu B Previous Page L Prev Menu ________________________________________________________________________________ co isdn auto Enter command Figure 5 17 ISDN Autocall Addresses Screen N MAR mmm SYSTEM NAME EDIT ISDN AUTOCALL ADDRESS ________________________________________________________________________________ Type MAC Address 000000000000 Remote unit name Bumpable FAL...

Страница 143: ...presents ScaNet OSI Name Service Indicates that a named service see Address below is available on the remote server accessed via an ISDN connection see Remote unit name below Banyan Vines Types are BANYANDEF default Banyan destination BANYAN Banyan server router BANYAN_WS or STREETTALK Autocalls of type BANYAN and BANYAN_WS are automatically configured and cannot be edited If the bridge receives a...

Страница 144: ...t bits in the IP address n 32 for hosts n 8 for Class A subnets n 24 for Class C subnets IPX_SAP IPX_RIP This parameter contains a multi part Novell network address parts may be truncated when displayed on the list screen with the following format nnnnnnnn mmmmmmmmmmmm ssss hh tt name where IPX_SAP This prefix must be added manually to the entry once it has been learnt if the bridge is to respond ...

Страница 145: ...hich will either be the Novell external or internal network number mmmmmmmmmmmm Node number of the server on the network this will typically be the MAC address of the node if connected to an Ethernet LAN network or a logical number usually 1 for an internal network ssss Socket number of the service on the server hh Number of hops to the server tt Number of ticks to the server name Name of the serv...

Страница 146: ...ber these are assigned by Novell Inc 00 hop count is not used in SAP entries 00 ticks are not used in SAP entries Main_Server is the service name that was advertised IPX_RIP 00001234 0800ab123456 0000 02 05 00001234 is the Novell internal network number of the server 0800ab123456 is the node number MAC address that advertised the service 0000 the socket is not used in RIP entries 02 is the number ...

Страница 147: ...annels are available determines whether a current autocall can be cleared when a further autocall request is received This feature allows for example a host to poll remote LANs in sequence each new poll clears the previous connection and sets up a new one Note if the ISDN channels are currently in use for bandwidth on demand or leased line backup then an autocall will not be attempted as bandwidth...

Страница 148: ...directory server Netware Directory Services 0047 advertising print server IPX NETWORK TYPE Applies only to IPX autocalls Options are 802 3 802 2 or ETH2 Ethernet 2 To set up or view an IPX 802 2 type Autocall table ask to view only 802 2 entries by entering VIEW 802 2 This shows only IPX_RIP IPX_SAP and IPX_WS entries for Network Type 802 2 Adding IPX_WS entries then sets them automatically to the...

Страница 149: ...p Demand Auto WEEKMORN Mo Tu We Th Fr 0900 1300 Yes Yes Yes WEEKAFTER Mo Tu We Th Fr 1300 1800 Yes No Yes WEEKEVEN Mo Tu We Th Fr 1800 0900 Yes No Yes SATURDAY Sa 0900 0900 No No Yes SUNDAY Su 0900 0900 No No No TOKEN Set Token Value REFILL Add Tokens EDIT Edit Band ADD Add Band DELETE Delete Band ________________________________________________________________________________ G Main Menu L Prev M...

Страница 150: ... DISABLED specifies if ISDN connections may be used to back up failed leased lines during this band DEMAND ENABLED or DISABLED specifies if ISDN connections may provide extra bandwidth on demand during this band AUTO ENABLED or DISABLED specifies if ISDN calls initiated automatically through Autocall table entries are allowed during this band ...

Страница 151: ...ens The Marlin Bridge can be set up to limit the length of time it can have ISDN calls up active based on a coin in the slot principle The administrator adds tokens each token is worth one second of ISDN call time When all tokens are used up no more ISDN calls can be made until the administrator adds more tokens co isdn ba Enter command TOKEN 3600 This command sets the number of seconds to be adde...

Страница 152: ...e the ISDN number of a remote Marlin Bridge has been configured in the local Marlin Bridge a manual connection can be made to it N MAR mmm SYSTEM NAME ISDN NUMBERS ________________________________________________________________________________ Page No n of m Name ISDN Number Cambridge 0223123456 Tyneside 0914569876 EDIT Edit Number ADD Add Number DELETE Delete Number CALL Call Number ____________...

Страница 153: ... be dialled up over ISDN using the associated number The names must match exactly the names configured in the remote Marlin Bridges themselves ISDN NUMBER The numbers to be dialled to reach the destination If more than one number is entered the Marlin Bridge will rotate through the numbers automatically when making calls TEST START TIME The Marlin Bridge can be configured to test the number automa...

Страница 154: ...sfully Manual calls can be made using the manager terminal command from anywhere in the manager e g CALL Cambridge RETURN or by selecting the remote Marlin Bridge s name using the front panel menu option CALL see menu tree at the beginning of this chapter Instead of adding ISDN numbers so that destinations are available permanently numbers can be entered directly e g CALL 0923710738 RETURN ...

Страница 155: ...ETURN where the digit after the is the subaddress To clear an established call enter CANCEL followed by the destination name or number to which the call was made e g CANCEL 0923710738 RETURN To clear a call using the front panel select the established call using the CALL menu and press the CANCEL button ...

Страница 156: ...d does not require a form For example ADD 0710000001 adds the entry to the list automatically CLI is only checked when a call is established and only operates on incoming calls N MAR mmm SYSTEM NAME CALLING LINE IDENTITY CHECK LIST ________________________________________________________________________________ Page No n of m No CLI 1 0223123456 2 0914569876 ADD Add Number DELETE Delete Number ___...

Страница 157: ...et N MAR mmm SYSTEM NAME TCP 32 WINS NAME LIST ________________________________________________________________________________ Page No n of m Name Description IP Addr Grumpy Main Server 192 0 2 2 Happy Accounts Server 192 0 2 21 EDIT Edit Name ADD Add Name DELETE Delete Name ________________________________________________________________________________ G Main Menu L Prev Menu __________________...

Страница 158: ...__________________________ Figure 5 25 Add Edit TCP 32 WINS Screen NAME Name of the resource server or workstation A name must be unique within a domain DESCRIPTION Description of the resource for information only It is not used in the protocol If the name has been learned Description will default to REGISTERED IP ADDRESS The IP Address of the resource GROUP ADDRESS Either Group or Specific Set al...

Страница 159: ...riate MIBs Management Information Base installed Contact your supplier for the Nautica Bridge MIB to enable you to manage the product range N MAR mmm SYSTEM NAME SNMP SYSTEM PARAMETERS ________________________________________________________________________________ Version N mmm Remote Trap Addr 0 0 0 0 Description INF Marlin Bridge Bridge Remote Trap Port 162 Name SystemName Contact John Smith Lo...

Страница 160: ...unit this password must be given in any SNMP protocol data received by the unit It would normally be issued only to those people and or organisations who are to be allowed access to configuration and other information on the unit default public PRIVATE COMMUNITY This password allows parameters that can be configured in the unit to be SET It must be given in any SNMP SET request or no action will b...

Страница 161: ...REFERENCE 5 68 REMOTE TRAP PORT Specifies the UDP User Datagram Protocol port which will receive any TRAPs issued by the unit TCP IP s UDP is used to encapsulate SNMP GETs SETs and TRAPs ...

Страница 162: ..._________________________________________ PORT Ports Stats BRIDGE Bridge Link Stats STP Spanning Tree Stats ISDN ISDN Call Stats HUBLET Hublet Stats TCP IP TCP IP Stats ________________________________________________________________________________ G Main Menu L Prev Menu ________________________________________________________________________________ stat Enter command Figure 5 27 Status and Sta...

Страница 163: ...________________________________________ Page No m of n No Name Type Phys Rx Tx LZC State LAN1 Local LAN Nmbr1 ETHERNET AUI 00 0 00 0 UP WAN1 Link to London 1 BRIDGE HDLC V 11 00 0 00 0 4 5 UP ISDN3 Backup Channel 1 BRIDGE TA ISDN 00 0 00 0 2 6 UP ISDN4 Backup Channel 2 BRIDGE TA ISDN 00 0 00 0 DOWN EXAM Examine ________________________________________________________________________________ N Nex...

Страница 164: ...Rx Missed Packets 0 ________________________________________________________________________________ G Main Menu L Prev Menu ________________________________________________________________________________ stat port exam Enter command Figure 5 29 Ethernet Statistics Screen Ethernet Address Unit address This is the formal 48 bit number of the MAC address Total Tx Rx Octets Total octets 8 bit bytes ...

Страница 165: ...e last time the statistics were reset The statistics on the right of the screen give a detailed list of errors by error type Low error counts are to be expected but if the error counts are higher than usual this could indicate a problem with the LAN segment to which the Marlin Bridge is connected ...

Страница 166: ... ________________________________________________________________________________ stat port exam Enter command Figure 5 30 Serial Interface Statistics Screen Port Number Name of this port e g WAN1 ISDN3 Total Tx Rx Octets Total octets 8 bit bytes transmitted received since the last time the statistics were reset Total Tx Rx Packets Total packets transmitted received since the last time the statist...

Страница 167: ...___________________________________________________ G Main Menu L Prev Menu ________________________________________________________________________________ st br Enter command Figure 5 31 Bridge Link Statistics Screen Link No Link number generated automatically for each entry STA State Spanning Tree Algorithm protocol State InFrames Number of frames arriving on the link since the last reset OutFr...

Страница 168: ..._____ G Main Menu L Prev Menu ________________________________________________________________________________ st br stp Enter command Figure 5 32 Link Spanning Tree Status Screen Link No Link number generated automatically Priority Priority of this link State State of the link forwarding disabled etc Enabled Shows the actual state of the link This will normally be enabled and only disabled if the...

Страница 169: ...ridge on the local network which handles the Designated Link see below Designated Link Link used to forward frames to the root bridge from the local network Fwd Transitions Number of times the link has changed from the forwarding state ...

Страница 170: ... Main Menu L Prev Menu ________________________________________________________________________________ stat stp Enter command Figure 5 33 Spanning Tree Statistics Screen Time Since Topology Change Time in seconds since the bridge took part in a change in the network topology Topology Change Count The number of topology changes since the last time the bridge was reset Designated Root Current desig...

Страница 171: ...rom the root bridge Forward Delay Current forwarding delay Learned Entry Discards Number of learned addresses which were discarded when there was not enough room in the filter table to hold them Multilink Overrun The number of times packets have been discarded due to insufficient buffer space ...

Страница 172: ...00 12 32 2 Yes ISDN4 0923710277 CONN 00 01 12 12 Yes ISDN5 0285641651 CALL 00 00 00 5 Yes HIST Display History ________________________________________________________________________________ N Next Page G Main Menu P Previous Page L Prev Menu ________________________________________________________________________________ st is Enter command Figure 5 34 ISDN Current Call Statistics Screen Port Po...

Страница 173: ...__________________________________________________________________________ N Next Page G Main Menu P Previous Page L Prev Menu ________________________________________________________________________________ stat is hi Enter command Figure 5 35 ISDN Total Channel Statistics Screen Destination Destination number dialled TotalTime Total connection time for all ISDN calls to Destination Good Calls To...

Страница 174: ...es RxOctets Coll FCSE Link Polarity Partitioned 1 000080123456 200 60897 5 0 UP YES 2 00C0C2202020 12 1088 0 0 UP 3 INFIBRIDGE 47 36092 0 3 UP 4 5 6 7 080030123456 11 2001 0 0 UP Reversed 8 CL Clear Counters ________________________________________________________________________________ N Next Page G Main Menu P Previous Page L Prev Menu ___________________________________________________________...

Страница 175: ...ITOR ________________________________________________________________________________ CONN TCP Connections TCP TCP Stats SNMP SNMProtocol Stats UDP UDP Stats IP IP Stats ARP ARP Address Table IFACE Interface Table ________________________________________________________________________________ G Main Menu L Prev Menu ________________________________________________________________________________ ...

Страница 176: ...its on the network For more details on using the Remote Connect facility please see the MANAGER OPERATION chapter of this manual N MAR mmm SYSTEM NAME REMOTE UNITS ________________________________________________________________________________ Page No m of n Unit Name IP Address MAC Address LONDON 123 123 123 123 123456789012 NEW_YORK 12 34 45 67 123456712345 Enter unit name or REM name or REM ip...

Страница 177: ...he remote Marlin Bridge Relevant Commands REM There are various ways to select a remote Marlin Bridge 1 REM name RETURN 2 REM IP Addr port RETURN 3 REM RETURN with remote unit highlighted using the cursor keys When connected to the remote Marlin Bridge typing QUIT terminates the remote Marlin Bridge manager session and returns to the previous manager session Typing CTRL D aborts and returns to the...

Страница 178: ... and the stored configuration is loaded 6 3 CONFIGURATION DUMP The current SAVEd configuration of the unit can be dumped from the Manager This configuration is in human readable format except for passwords and may be used for comparison with other installations Configurations may also be loaded and run via the management interface Typing DCONFIG from any menu causes the current SAVEd configuration...

Страница 179: ...accessed from any menu by typing TW Exit from the Trace Window at any time by pressing the Space bar The Trace Window often contains more information than the user requires as it is designed for diagnosis of complex problems by qualified support personnel The messages output by the system will change between software revisions as product features are added or enhanced To assist in problem diagnosi...

Страница 180: ...ber 123456 but the call fails due to reason 17 User Busy The second column in the Trace Window is the Trace Record number If the numbers are not in unbroken sequence then some Trace messages have been lost due to the Marlin Bridge being too busy The third column is a time stamp number of milliseconds since the Marlin Bridge was last rebooted Only one Manager can have the Trace Window open at any o...

Страница 181: ...learing 17 User Busy 18 No user responding 19 No answer from user user alerted 21 Call Rejected 22 Number Changed 26 Non selected user clearing 27 Destination out of order 28 Invalid number format 29 Facility Rejected 30 Response to status enquiry 31 Normal unspecified 34 No circuit Channel not available 38 Network out of order 41 Temporary failure 42 Switching equipment congestion 43 Access infor...

Страница 182: ...below lists the internal ISDN call clearing codes generated by the Nautica BRI Terminal Adapter Reason Description 128 143 Call control timer expiry 145 Data link failure 146 TEI or SPID USA negotiation failure 162 Network access not connected 177 Call clearing due to restart procedure Table 6 2 Internal Clearing Codes ...

Страница 183: ...r devices on the local network can be pinged to make sure that the terminal device is functioning correctly To check if the bridge has received any packets from the terminal device the ARP list can be viewed by typing STAT TCP ARP This list is the mapping of IP addresses to physical Ethernet MAC addresses that the bridge has learned on the local network The local terminal first sends an ARP reques...

Страница 184: ...ver the login process can then begin The first step in faultfinding is to ensure that the local bridge is configured to respond to Get Nearest Server requests if necessary Next the relevant autocalls see REFERENCE chapter should be learned for the correct Novell external network number and Ethernet frame type for the segment to which it is attached If the local bridge configuration appears correct...

Страница 185: ...N line that you are trying to test If you have given a different local number to each B channel use the one you configured under ISDN2 if you use the one configured under ISDN1 you will get a busy signal clearing code 17 If all is working well the ISDN Port Status screen will show both the outgoing and incoming calls made from and to the unit If there is a problem the error code sent by the networ...

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