Page 2 - Configure Source-Route Bridging; Configure a Dual-Port Bridge; Note; Token
Configure Source-Route Bridging BC-110 Bridging and IBM Networking Configuration Guide Configure Source-Route Bridging Our implementation of source-route bridging enables you to connect two or more Token Ring networks using either Token Ring or Fiber Distributed Data Interface (FDDI) media. The Cisc...
Page 3 - Multiple Dual-Port Bridges; Configure a Multiport Bridge Using a Virtual Ring; Figure 47 shows a multiport bridge using a virtual ring.
Configure a Multiport Bridge Using a Virtual Ring Configuring Source-Route Bridging BC-111 A dual-port bridge is a limitation imposed by IBM Token Ring chips; the chips can process only two ring numbers. If you have a router with two or more Token Ring interfaces, you can work around the two-ring nu...
Page 4 - Multiport Bridge Using a Virtual Ring; Define a Ring Group in SRB Context; Command
Configure Source-Route Bridging BC-112 Bridging and IBM Networking Configuration Guide Figure 47 Multiport Bridge Using a Virtual Ring To take advantage of this virtual ring feature, each Token Ring interface on the router must be configured to belong to the same ring group. For information about co...
Page 5 - Enable SRB and Assign a Ring Group to an Interface; Configure SRB over FDDI; interface fddi
Configure SRB over FDDI Configuring Source-Route Bridging BC-113 Enable SRB and Assign a Ring Group to an Interface After you have defined a ring group, you must assign that ring group to those interfaces you plan to include in that ring group. An interface can only be assigned to one ring group. To...
Page 6 - Configure Fast-Switching SRB over FDDI
Configure Source-Route Bridging BC-114 Bridging and IBM Networking Configuration Guide Configure Fast-Switching SRB over FDDI Fast-Switching SRB over FDDI enhances performance. For example, if you want to use access-lists, fast-switching SRB over FDDI provides fast performance and access-list filter...
Page 7 - Enable the Automatic Spanning-Tree Function; source-bridge spanning
Enable the Automatic Spanning-Tree Function Configuring Source-Route Bridging BC-115 Forwarding all-routes explorer packets is the default. However, in complicated source-route bridging topologies, using this default can generate an exponentially large number of explorers that are traversing the net...
Page 8 - Limit the Maximum SRB Hops; bridge
Configure Source-Route Bridging BC-116 Bridging and IBM Networking Configuration Guide To create a bridge group that runs an automatic spanning-tree function compatible with the IBM SRB spanning-tree implementation, use the following command in global configuration mode: To enable the automatic span...
Page 9 - Configure Bridging of Routed Protocols; Enable Use of the RIF
Configure Bridging of Routed Protocols Configuring Source-Route Bridging BC-117 Configure Bridging of Routed Protocols Source-route bridges use Media Access Control (MAC) information, specifically the information contained in the RIF, to bridge packets. A RIF contains a series of ring and bridge num...
Page 10 - VINES; Configure a Static RIF Entry; The; rif validate enable; commands have no effect on remote entries learned over RSRB.
Configure Bridging of Routed Protocols BC-118 Bridging and IBM Networking Configuration Guide • VINES • XNS Enable use of the RIF only on Token Ring interfaces on the router. To configure the Cisco IOS software to append RIF information, use the following command in interface configuration mode: For...
Page 11 - no source-bridge transparent
Configure Translation between SRB and Transparent Bridging Environments Configuring Source-Route Bridging BC-119 Configure Translation between SRB and Transparent Bridging Environments Source-route translational bridging (SR/TLB) is a Cisco IOS software feature that allows you to combine SRB and tra...
Page 12 - Example of a Simple SR/TLB Topology
Configure Translation between SRB and Transparent Bridging Environments BC-120 Bridging and IBM Networking Configuration Guide Figure 50 Example of a Simple SR/TLB Topology Note The Spanning-Tree Protocol messages used to prevent loops in the transparent bridging domain are not passed between the SR...
Page 13 - To enable SR/TLB, you must perform the task in the following section:; Enable Bridging between Transparent Bridging and SRB; source-bridge transparent
Enable Bridging between Transparent Bridging and SRB Configuring Source-Route Bridging BC-121 We currently know that problems occur with the following protocols when bridged between Token Ring and other media: Novell IPX, DECnet Phase IV, AppleTalk, VINES, XNS, and IP. Further, problems can occur wi...
Page 14 - Enable Token Ring LLC2-to-Ethernet Conversion; Token Ring LLC2 to Ethernet Type II (0x80d5 processing); Enable Standard Token Ring LLC2-to-Ethernet LLC2 Conversion
Configure Translation between SRB and Transparent Bridging Environments BC-122 Bridging and IBM Networking Configuration Guide Enable Token Ring LLC2-to-Ethernet Conversion The Cisco IOS software supports the following types of Token Ring-to-Ethernet frame conversions using Logical Link Control, typ...
Page 15 - Configure NetBIOS Support
Configure NetBIOS Support Configuring Source-Route Bridging BC-123 Configure NetBIOS Support NetBIOS is a nonroutable protocol that was originally designed to transmit messages between stations, typically IBM PCs, on a Token Ring network. NetBIOS allows messages to be exchanged between the stations ...
Page 16 - Create Static Entries in the NetBIOS Name Cache; Enable the Proxy Explorers Feature on the Appropriate Interface; entry for the appropriate interface.; If that entry does not exist, look for the; Specify Timeout and Enable NetBIOS Name Caching; netbios name-cache timeout
Configure NetBIOS Support BC-124 Bridging and IBM Networking Configuration Guide • Create Static Entries in the NetBIOS Name Cache • Specify Dead-Time Intervals for NetBIOS Packets Enable the Proxy Explorers Feature on the Appropriate Interface In order to enable NetBIOS name caching on an interface...
Page 17 - Configure the NetBIOS Cache Name Length
Configure the NetBIOS Cache Name Length Configuring Source-Route Bridging BC-125 Configure the NetBIOS Cache Name Length To specify how many characters of the NetBIOS type name that the name cache will validate, enter the following command in global configuration mode: Enable NetBIOS Proxying The Ci...
Page 18 - Configure LNM Support
Configure LNM Support BC-126 Bridging and IBM Networking Configuration Guide The Cisco IOS software also converts pairs of FIND_NAME and NAME_RECOGNIZED packets received from explorers, which traverse all rings, to specific route frames that are sent only between the two machines that need to see th...
Page 19 - LNM Linking to a Source-Route Bridge on Each Local Ring
Configure LNM Support Configuring Source-Route Bridging BC-127 Figure 51 LNM Linking to a Source-Route Bridge on Each Local Ring If LNM requires information about a station somewhere on a Token Ring, it uses a proprietary IBM protocol to query to one of the source-route bridges connected to that rin...
Page 20 - LAN Network Manager Monitoring and Translating; How a Router Works with LNM; beaconing
Configure LNM Support BC-128 Bridging and IBM Networking Configuration Guide Figure 52 LAN Network Manager Monitoring and Translating Notice that the proprietary protocol LNM uses to communicate with the source-route bridge is an LLC2 connection. Although its protocol cannot be routed, LNM can monit...
Page 21 - multiport; Disable LNM Functionality
Configure LNM Software on the Management Stations to Communicate with the Router Configuring Source-Route Bridging BC-129 When SRB is enabled on the router, configuring the Cisco IOS software to perform the functions of an IBM Bridge for communication with LNM occurs automatically. Therefore, if SRB...
Page 22 - no lnm rem; and; no lnm rps; Disable Automatic Report Path Trace Function; lnm pathtrace-disabled; Enable Other LRMs to Change Router Parameters
Configure LNM Support BC-130 Bridging and IBM Networking Configuration Guide The command can be used to terminate all LNM server input and reporting links. In normal circumstances, this command should not be necessary because it is a superset of the functions normally performed on individual interfa...
Page 23 - Apply a Password to an LNM Reporting Link; lnm alternate; lnm password; lnm crs
Apply a Password to an LNM Reporting Link Configuring Source-Route Bridging BC-131 To enable other LRMs to change router parameters, use the following command in interface configuration mode: Apply a Password to an LNM Reporting Link Each reporting link has its own password that is used not only to ...
Page 24 - Change an LNM Reporting Interval; Enable the RPS Express Buffer Function; Monitor LNM Operation
Configure LNM Support BC-132 Bridging and IBM Networking Configuration Guide Change an LNM Reporting Interval All stations on a Token Ring notify the Ring Error Monitor (REM) when they detect errors on the ring. In order to prevent excessive messages, error reports are not sent immediately, but are ...
Page 25 - Secure the SRB Network; Configure NetBIOS Access Filters; Configure NetBIOS Access Filters Using Station Names
Secure the SRB Network Configuring Source-Route Bridging BC-133 Secure the SRB Network This section describes how to configure three features that are used primarily to provide network security: NetBIOS access filters, administrative filters, and access expressions that can be combined with administ...
Page 26 - Configure NetBIOS Access Filters Using a Byte Offset; To configure access filters you must do the following:
Secure the SRB Network BC-134 Bridging and IBM Networking Configuration Guide The NetBIOS station access list contains the station name to match, along with a permit or deny condition. You must assign the name of the access list to a station or set of stations on the network. To assign a station acc...
Page 27 - Configure Administrative Filters for Token Ring Traffic; Bridging and IBM Networking Command; Filter Frames by Protocol Type; permit
Configure Administrative Filters for Token Ring Traffic Configuring Source-Route Bridging BC-135 Configure Administrative Filters for Token Ring Traffic Source-route bridges normally filter frames according to the routing information contained in the frame. That is, a bridge will not forward a frame...
Page 28 - Filter Frames by Vendor Code
Secure the SRB Network BC-136 Bridging and IBM Networking Configuration Guide To enable filtering on input or output, use one of the following commands in interface configuration mode: You can filter SNAP-encapsulated packets on either input or output. The access list you specify is the one you crea...
Page 29 - LSAP and SNAP type codes
Configure Access Expressions that Combine Administrative Filters Configuring Source-Route Bridging BC-137 Configure Access Expressions that Combine Administrative Filters You can use access expressions to combine access filters to establish complex conditions under which bridged frames can enter or ...
Page 30 - Configure Access Expressions; pass; Optimize Access Expressions
Secure the SRB Network BC-138 Bridging and IBM Networking Configuration Guide Configure Access Expressions To configure an access expression perform the following tasks: • Design the access expression. • Configure the access lists used by the expression. • Configure the access expression into the ro...
Page 31 - Alter Access Lists Used in Access Expressions; Tune the SRB Network
Tune the SRB Network Configuring Source-Route Bridging BC-139 The access lists defined in the previous section create the following configuration: interface tokenring 0 access-expression in ~lsap(202) | dmac(701) ! access-list 202 permit 0x0404 0x0001 ! Permits SNA frames (command or response) acces...
Page 32 - Enable or Disable the Source-Route Fast-Switching Cache; filters disables the autonomous switching of SRB frames.
Tune the SRB Network BC-140 Bridging and IBM Networking Configuration Guide Enable or Disable the Source-Route Fast-Switching Cache Rather than processing packets at the process level, the fast-switching feature enables the Cisco IOS software to process packets at the interrupt level. Each packet is...
Page 33 - Enable or Disable the SSE
Enable or Disable the SSE Configuring Source-Route Bridging BC-141 Enable or Disable the SSE The Silicon Switch Engine (SSE) acts as a programmable cache to speed the switching of packets. To enable or disable the SSE, use one of the following commands in interface configuration mode: Establish the ...
Page 35 - Configure Proxy Explorers; Establish SRB Interoperability with TI MAC Firmware
Configure Proxy Explorers Configuring Source-Route Bridging BC-143 Configure Proxy Explorers You can use the proxy explorers feature to limit the amount of explorer traffic propagating through the source-bridge network. To configure proxy explorers, use the following command in interface configurati...
Page 36 - Report Spurious Frame-Copied Errors; Monitor and Maintain the SRB Network
Monitor and Maintain the SRB Network BC-144 Bridging and IBM Networking Configuration Guide Report Spurious Frame-Copied Errors An IBM 3174 cluster controller can be configured to report frame-copied errors to IBM LAN Network Manager software. These errors indicate that another host is responding to...
Page 37 - SRB Configuration Examples; show span; clear sse
SRB Configuration Examples Configuring Source-Route Bridging BC-145 To maintain the SRB network, use any of the following commands in privileged EXEC mode: In addition to the EXEC-mode commands to maintain the SRB network, you can use the following command in global configuration mode: SRB Configura...
Page 38 - Basic SRB with Spanning-Tree Explorers Example; Dual-Port Source-Route Bridge Configuration
SRB Configuration Examples BC-146 Bridging and IBM Networking Configuration Guide • NetBIOS Support with a Static NetBIOS Cache Entry Example • LNM for a Simple Network Example • LNM for a More Complex Network Example • NetBIOS Access Filters Example • Filtering Bridged Token Ring Packets to IBM Mac...
Page 39 - Optimized Explorer Processing Configuration Example
SRB with Automatic Spanning-Tree Function Configuration Example Configuring Source-Route Bridging BC-147 SRB with Automatic Spanning-Tree Function Configuration Example The following example of a Cisco series 7000 router configuration illustrates how to enable the automatic spanning tree function on...
Page 40 - SRB and Routing Certain Protocols Example
SRB Configuration Examples BC-148 Bridging and IBM Networking Configuration Guide SRB and Routing Certain Protocols Example In the following configuration, IP, XNS, and IPX are routed, while all other protocols are bridged between rings. While not strictly necessary, the Novell IPX and XNS network n...
Page 41 - The following is a sample configuration file:; SRB with Multiple Virtual Ring Groups Example; Two Virtual Rings Connected by an Actual Token Ring; Configuration for Router A
SRB with Multiple Virtual Ring Groups Example Configuring Source-Route Bridging BC-149 The following is a sample configuration file: source-bridge ring-group 7 ! interface tokenring 0 source-bridge 1000 1 7 source-bridge spanning ! interface tokenring 1 source-bridge 1001 1 7 source-bridge spanning ...
Page 42 - Configuration for Router B; SRB over FDDI Configuration Examples; SRB over FDDI Configuration; SRB over FDDI Fast-Switching Example; The following example shows SRB over FDDI fast-switching:
SRB Configuration Examples BC-150 Bridging and IBM Networking Configuration Guide Configuration for Router B source-bridge ring-group 200 ! interface tokenring 0 source-bridge 3 1 200 source-bridge spanning ! interface tokenring 2 source-bridge 2 1 200 source-bridge spanning SRB over FDDI Configurat...
Page 43 - SRB over Frame Relay Configuration Example; FRAD Using SRB over Frame Relay to Connect to a Cisco Router
SRB over Frame Relay Configuration Example Configuring Source-Route Bridging BC-151 SRB over Frame Relay Configuration Example Figure 59 illustrates a network with the following characteristics: • Virtual Ring Number of Router A = 100 • Virtual Ring Number of FRAD B = 200 • Virtual Ring Number of FR...
Page 44 - Configuration of Router A; Adding a Static RIF Cache Entry Example
SRB Configuration Examples BC-152 Bridging and IBM Networking Configuration Guide Configuration of Router A source-bridge ring-group 100 ! interface Serial1 encapsulation frame-relay ! interface Serial1.1 point-to-point frame-relay interface-dlci 30 ietf source-bridge 200 1 100 conserve-ring source-...
Page 45 - Assigning a RIF to a Source-Route Bridge; Adding a Static RIF Cache Entry for a Two-Hop Path Example; Assigning a RIF to a Two-Hop Path; SR/TLB for a Simple Network Example; Example of a Simple SR/TLB Configuration; Bridge 1
Adding a Static RIF Cache Entry for a Two-Hop Path Example Configuring Source-Route Bridging BC-153 Figure 60 Assigning a RIF to a Source-Route Bridge The static RIF entry would be submitted to the router on the left as follows: rif 1000.5A12.3456 0630.0081.0090 Adding a Static RIF Cache Entry for a...
Page 46 - Now you are ready to determine two things:
SRB Configuration Examples BC-154 Bridging and IBM Networking Configuration Guide Assume that the following configuration for SRB and transparent bridging existed before you wanted to enable SR/TLB: interface tokenring 0 source-bridge 1 1 2 ! interface tokenring 1 source-bridge 2 1 1 ! interface eth...
Page 47 - transparent; following partial configuration includes this; SR/TLB with Access Filtering Example; Example of a Bit-Swapped Address
SR/TLB with Access Filtering Example Configuring Source-Route Bridging BC-155 Once you have determined the ring number and the bridge number, you can add the source-bridge transparent command to the file, including these two values as parameters for the command. The following partial configuration i...
Page 48 - NetBIOS Support with a Static NetBIOS Cache Entry Example; Specifying a Static Entry
SRB Configuration Examples BC-156 Bridging and IBM Networking Configuration Guide The command for the Token Ring interface specifies that the access list 701 be applied on the source address of frames going out to the Token Ring, and the command for the Ethernet interface specifies that this access ...
Page 49 - LNM for a Simple Network Example; The associated configuration file follows:; show lnm config
LNM for a Simple Network Example Configuring Source-Route Bridging BC-157 LNM for a Simple Network Example Figure 65 shows a router with two Token Rings configured as a local source-route bridge. Figure 65 Router with Two Token Rings Configured as a Local Source-Route Bridge The associated configura...
Page 50 - LNM for a More Complex Network Example; Router with Three Token Rings Configured as a Multiport Bridge
SRB Configuration Examples BC-158 Bridging and IBM Networking Configuration Guide LNM for a More Complex Network Example Figure 66 shows a router with three Token Rings configured as a multiport bridge, thus employing the concept of the virtual ring. Figure 66 Router with Three Token Rings Configure...
Page 51 - pertinent information for configuring this router into LNM:; NetBIOS Access Filters Example
NetBIOS Access Filters Example Configuring Source-Route Bridging BC-159 The show lnm config command displays the logical configuration of this bridge, including all the pertinent information for configuring this router into LNM: Wayfarer# show lnm config Bridge(s) currently configured: From ring 001...
Page 52 - Filtering Bridged Token Ring Packets to IBM Machines Example; Router Filtering Bridged Token Ring Packets to IBM Machines
SRB Configuration Examples BC-160 Bridging and IBM Networking Configuration Guide Access lists are scanned in order. In the following example, the first list denies all entries beginning with the letters ABC, including one named ABCD. This voids the second command, because the entry permitting a nam...
Page 53 - Figure 68 shows a router connecting four Token Rings.
Administrative Access Filters—Filtering SNAP Frames on Output Example Configuring Source-Route Bridging BC-161 Administrative Access Filters—Filtering SNAP Frames on Output Example Figure 68 shows a router connecting four Token Rings. Figure 68 Router Filtering SNAP Frames on Output The following ex...
Page 54 - Creating Access Filters Example; This phrase was converted to the simpler form of:; The following access expression would result:
SRB Configuration Examples BC-162 Bridging and IBM Networking Configuration Guide access-list 203 permit 0xE0E0 0x0101 access-list 203 deny 0x0000 0xFFFF Note that it is not necessary to check for an LSAP of 0xAAAA when filtering SNAP-encapsulated AppleTalk packets, because for source-route bridging...
Page 55 - Access Filters Example; Network Configuration Using NetBIOS Access Filters; Fast-Switching Example
Access Filters Example Configuring Source-Route Bridging BC-163 Access Filters Example Figure 69 shows two routers connecting two Token Rings to an FDDI backbone. Figure 69 Network Configuration Using NetBIOS Access Filters Suppose you want to permit the IBM 3174 cluster controllers to access the FE...
Page 56 - Autonomous Switching Example
SRB Configuration Examples BC-164 Bridging and IBM Networking Configuration Guide Autonomous Switching Example The following example enables use of autonomous switching between two ciscoBus Token Ring interfaces in the same router. Frames entering Token Ring interfaces 0 or 1 will be autonomously sw...
