Cisco Systems BC-145 manual Configuring Hot Standby Router Protocol over Trisl, BC-149

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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:

 

Command

Purpose

Step 1

 

 

Router(config-if)# multiring

Creates a pseudoring to terminate the RIF and assigns it to a VLAN.

 

trcrf-vlanvlanid ring ring-number

 

Step 2

 

 

Router(config-if)# multiring

Enables collection and use of RIF information with routed protocols.

 

{protocol-keyword [all-routes

 

 

spanning all other]}

 

 

 

 

Note TRISL encapsulation must be specified for a subinterface before an IP address can be assigned to that subinterface.

Configuring Hot Standby Router Protocol over TRISL

The Hot Standby Router Protocol (HSRP) provides fault tolerance and enhanced routing performance for IP networks. HSRP allows Cisco routers to monitor each other’s operational status and very quickly assume packet forwarding responsibility in the event the current forwarding device in the HSRP group fails or is taken down for maintenance. The standby mechanism remains transparent to the attached hosts and can be deployed on any LAN type. With multiple hot-standby groups, routers can simultaneously provide redundant backup and perform load-sharing across different IP subsets.

To configure HSRP over TRISL between VLANs, use the following commands beginning in global configuration mode:

 

Command

Purpose

Step 1

 

 

Router(config)# interface type

Specifies the subinterface on which ISL will be used.

 

slot/port subinterface-number

 

Step 2

 

 

Router(config-if)# encapsulation

Defines the encapsulation format, and specify the VLAN identifier.

 

tr-isl trbrf-vlan vlanid bridge-num

 

 

bridge-number

 

Step 3

 

 

Router(config-if)# ip address

Specifies the IP address for the subnet on which ISL will be used.

 

ip-address mask [secondary]

 

Step 4

 

 

Router(config-if)# standby

Enables HSRP.

 

[group-number]ip

 

 

[ip-address [secondary]]

 

 

 

 

 

 

Cisco IOS Bridging and IBM Networking Configuration Guide

 

 

 

 

 

 

 

78-11737-02

 

 

BC-149

 

 

 

 

 

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Contents BC-145 Cisco’s Trisl ImplementationISL and Trisl BC-146 BC-147 Token Ring VLANsBC-148 Configuring IP Routing over TrislBC-149 Configuring Hot Standby Router Protocol over TrislBC-150 Configuring IPX Routing over TrislBC-151 Configuring Source-Route Bridging over TrislConfiguring Source-Route Transparent Bridging over Trisl BC-152 Configuring Source-Route Translational Bridging over TrislBC-153 Monitoring Trisl StatisticsBC-154 Trisl Configuration ExamplesBC-155 Following is the configuration for the router5500 BC-156BC-157 BC-158 IP Routing Source-Routed Frames Between Trisl VLANs ExampleEncapsulation tr-isl trbrf 999 bridge-num BC-159BC-160 BC-161 BC-162 IPX Routing Source-Routed Frames Between Trisl VLANs ExampleBC-163 SRB Between Token Ring and Trisl Vlan ExampleBC-164 SRB Between Trisl VLANs ExampleBC-165 Transparent Bridging Between Token Ring and Trisl Vlan BC-166SR/TLB Between a Trisl Vlan and an Ethernet Interface BC-167Set vlan 999 type trbrf bridge 0xe stp ibm BC-168BC-169 Trisl with Fast EtherChannel ExampleBC-170