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Configuring Token Ring Inter-Switch Link
This chapter explains how to configure Token Ring Inter-Switch Link (TRISL) on Cisco routers. The
chapter describes TRISL in the context of the Inter-Switch Link (ISL) protocol and the Token
Ring VLAN concept.
For a complete description of the Token Ring Inter-Switch Link commands in this chapter, refer to the
“Token Ring Inter-Switch Link Commands” chapter in the Cisco IOS Bridging and IBM Networking
Command Reference (Volume 1 of 2). To locate doc
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Configuring Token Ring Inter-Switch Link Technology Overview TRISL support on Cisco routers provides inter-VLAN routing and bridging across a 100-Mb Fast Ethernet link. ISL and TRISL together provide routing and bridging between Token Ring and Ethernet LANs, ELANS, and VLANs. TRISL is supported on the following platforms with any one of the following port adapters: � Cisco 7500 or Cisco 7200 series routers – Two-port Fast Ethernet/ISL 100BaseTX – Two-port Fast Ethernet/ISL 100BaseFX – One-p
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Configuring Token Ring Inter-Switch Link Technology Overview Token Ring VLANs A VLAN is essentially a broadcast domain. In transparent bridging, there is only one type of broadcast frame and, therefore, only one level of broadcast domain and one level of VLAN. In source routing, however, there are two types of broadcast frames: � Those that are confined to a single ring � Those that traverse the bridged domain Therefore, there are two levels of VLANs in a Token Ring switched network. The fi
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Configuring Token Ring Inter-Switch Link TRISL Configuration Task List Figure 54 illustrates a TrBRF that contains TrCRFs on both a router and a switch. Figure 54 TrCRFs in a TrBRF TRISL Switch TrCRF TrBRF TrCRF TrCRF TRISL Configuration Task List To configure and monitor TRISL in your network, perform one or more of the following tasks: � Configuring IP Routing over TRISL, page 148 � Configuring Hot Standby Router Protocol over TRISL, page 149 � Configuring IPX Routing over TRISL, page 150 �
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Configuring Token Ring Inter-Switch Link TRISL Configuration Task List You can configure TRISL to route source-routed traffic by enabling the collection and use of RIF information on a TRISL subinterface. This creates a “pseudoring” to terminate the RIF path on a ring. Without RIF information, a packet could not be bridged across a source-route bridged network connected to this interface. To route source-routed traffic, use the following additional commands in interface configuration mode:
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Configuring Token Ring Inter-Switch Link TRISL Configuration Task List To customize hot standby group attributes, use one of the following commands in interface configuration mode, as needed: Command Purpose Router(config-if)# standby [group-number] Configures the time between hello packets and the hold time before timers hellotime holdtime other routers declare the active router to be down. Router(config-if)# standby [group-number] Sets the hot standby priority used to choose the active r
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Configuring Token Ring Inter-Switch Link TRISL Configuration Task List Note The default IPX encapsulation format for Token Ring in Cisco IOS routers is SAP. Therefore, you only need to explicitly configure the IPX encapsulation type if your Token Ring network requires SNAP encapsulation instead of SAP. When routing source-routed traffic for specific VLANs, use the following additional commands in interface configuration mode: Command Purpose Router(config-if)# multiring Step 1 Creates a ps
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Configuring Token Ring Inter-Switch Link TRISL Configuration Task List Configuring Source-Route Translational Bridging over TRISL To configure source-route translational bridging over TRISL, use the following commands beginning in global configuration mode: Command Purpose Router(config)# source-bridge ring-group vring-num Step 1 Configures a virtual ring for the router. Step 2 Router(config)# source-bridge transparent ring-group Enables bridging between transparent bridging and pseudoring
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Configuring Token Ring Inter-Switch Link Monitoring TRISL Statistics To enable the automatic spanning-tree function for a specified group of bridged interfaces in SRB or SR/TLB, use the following command in interface configuration mode: Command Purpose Router(config-if)# source-bridge Enables the automatic spanning-tree function on a group of bridged interfaces. spanning bridge-group Monitoring TRISL Statistics You can collect, clear, and display statistical information about the network. Th
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Configuring Token Ring Inter-Switch Link TRISL Configuration Examples TRISL Configuration Examples The following sections provide TRISL configuration examples: � IP Routing Non-Source-Routed Frames Between a TRISL VLAN and a Token Ring Interface Example, page 155 � IP Routing Source-Routed Frames Between a TRISL VLAN and a Token Ring Interface Example, page 156 � IP Routing Source-Route Frames Between a TRISL VLAN and an Ethernet ISL VLAN Example, page 157 � IP Routing Source-Routed Frames
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Configuring Token Ring Inter-Switch Link TRISL Configuration Examples IP Routing Non-Source-Routed Frames Between a TRISL VLAN and a Token Ring Interface Example Figure 55 illustrates IP routing between a TRISL VLAN and a Token Ring interface. Figure 55 IP Routing Between a TRISL VLAN and a Token Ring Interface Catalyst 5000 switch 5000 Token Ring Fast Ethernet 4/0.1 TrBRF 999/Bridge 14 switch module 5.5.5.1 4.4.4.1 TrCRF VLAN 40 Token Token Slot 5 Ring 1 Ring 2 Port 1 End station End station
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Configuring Token Ring Inter-Switch Link TRISL Configuration Examples IP Routing Source-Routed Frames Between a TRISL VLAN and a Token Ring Interface Example Figure 56 illustrates IP routing source-routed frames between a TRISL VLAN and a Token Ring interface. Figure 56 Routing Source-Routed Frames Between a TRISL VLAN and a Token Ring Interface Catalyst 5000 switch 5500 TrCRF 200 Token Ring Fast Ethernet 4/0.1 TrBRF 999/Bridge 14 switch module 100 5.5.5.1 4.4.4.1 TrCRF VLAN 40 Token Token S
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Configuring Token Ring Inter-Switch Link TRISL Configuration Examples IP Routing Source-Route Frames Between a TRISL VLAN and an Ethernet ISL VLAN Example Figure 57 illustrates IP routing source-route frames between a TRISL VLAN and an Ethernet ISL VLAN. Figure 57 IP Routing Source-Routed Frames Between a TRISL VLAN and an Ethernet ISL VLAN Catalyst 5000 switch Ethernet Ethernet ISL VLAN 12 module 5500 End station in slot 2 Router A 4.4.4.1 5.5.5.1 Token Ring Token TrBRF 999/Bridge 14 Ring s
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Configuring Token Ring Inter-Switch Link TRISL Configuration Examples IP Routing Source-Routed Frames Between TRISL VLANs Example Figure 58 illustrates IP routing source-routed frames between two TrBRF VLANs. Figure 58 IP Routing Source-Routed Frames Between TrBRF VLANs Catalyst 5000 switch TrCRF 200 Fast Ethernet 4/0.1 TrBRF 999/Bridge 14 Router 100 Token Ring 5500 5.5.5.1 switch module 4.4.4.1 101 Fast Ethernet 4/0.2 TrBRF 998/Bridge 13 TrCRF 300 TrCRF TrCRF VLAN 40 Token Token VLAN 50 Rin
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Configuring Token Ring Inter-Switch Link TRISL Configuration Examples IPX Routing Non-Source-Routed Frames Between a TRISL VLAN and a Token Ring Interface Example Figure 59 shows IPX routing non-source-routed frames between a TRISL VLAN and a Token Ring interface. Figure 59 IPX Routing Non-Source-Routed Frames Between a TRISL VLAN and a Token Ring Interface Example Catalyst 5000 switch 5500 Token Ring Fast Ethernet 4/0.1 TrBRF 999/Bridge 14 switch Network 10 module Network 1 TrCRF VLAN 40 T
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Configuring Token Ring Inter-Switch Link TRISL Configuration Examples IPX Routing Source-Routed Frames Between a TRISL VLAN and a Token Ring Interface Example Figure 60 shows IPX routing source-routed frames between a TRISL VLAN and a Token Ring interface. Figure 60 IPX Routing Source-Routed Frames Between a TRISL VLAN and a Token Ring Interface Catalyst 5000 switch 5500 Token Ring Fast Ethernet 4/0.1 TrBRF 999/Bridge 14 switch Network 10 module Network 1 TrCRF VLAN 40 Token Token Slot 5 Ring
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Configuring Token Ring Inter-Switch Link TRISL Configuration Examples IPX Routing Source-Route Frames Between a TRISL VLAN and an Ethernet ISL VLAN Example Figure 61 shows IPX routing source-route frames between a TRISL VLAN and an Ethernet ISL VLAN. Figure 61 IPX Routing Source-Routed Frames Between a TRISL VLAN and an Ethernet ISL VLAN Catalyst 5000 switch Ethernet Ethernet ISL VLAN 12 module 5500 End station in slot 2 Router A Network 30 Token Ring Token TrBRF 999/Bridge 14 Network 10 swi
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Configuring Token Ring Inter-Switch Link TRISL Configuration Examples IPX Routing Source-Routed Frames Between TRISL VLANs Example Figure 62 shows IPX source-routed frames between TRISL VLANs. Figure 62 IPX Routing Source-Routed Frames Between TRISL VLANs Catalyst 5000 switch TrCRF 200 Fast Ethernet 4/0.1 TrBRF 999/Bridge 14 Router 100 5500 Token Ring Network 10 switch module Network 20 101 Fast Ethernet 4/0.2 TrBRF 998/Bridge 13 TrCRF 300 TrCRF TrCRF Token Token VLAN 50 VLAN 40 Ring Ring Sl
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Configuring Token Ring Inter-Switch Link TRISL Configuration Examples #add token port to trcrf 50 set vlan 50 5/2 set trunk 1/2 on SRB Between Token Ring and TRISL VLAN Example Figure 63 illustrates SRB between a Token Ring interface on a router and a TRISL VLAN. Figure 63 SRB Between a Token Ring Interface and TRISL VLAN Catalyst VLAN switch forwarding TRISL VLAN traffic Router with Fast Ethernet adapter 5500 TrCRF 40 TrBRF 999/Bridge 14 Token Ring switch module 100 TrCRF VLAN 50 Token Tok
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Configuring Token Ring Inter-Switch Link TRISL Configuration Examples SRB Between TRISL VLANs Example Figure 64 illustrates SRB between two TrCRF VLANs. Figure 64 SRB Between TRISL VLANs Catalyst 5000 switch Router with Fast Ethernet Token 5500 adapter Ring Fast Ethernet 4/0.2 TrBRF 998/Bridge 13 TrCRF 102 switch Fast Ethernet 4/0.1 TrBRF 999/Bridge 14 module 101 TrCRF 100 TrCRF TrCRF VLAN 40 Token Token VLAN 50 Slot 5 Ring Ring 1 Slot 5 10 Port 1 Port 2 End station End station The followin
