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Configuring Token Ring Inter-Switch Link
TRISL Configuration Task List
BC-149
Cisco IOS Bridging and IBM Networking Configuration Guide
78-11737-02
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:
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-if)# multiring
trcrf-vlan vlanid ring
ring-number
Creates a pseudoring to terminate the RIF and assigns it to a VLAN.
Step 2
Router(config-if)# multiring
{protocol-keyword [all-routes |
spanning | all | other]}
Enables collection and use of RIF information with routed protocols.
Command Purpose
Step 1
Router(config)# interface type
slot/port subinterface-number
Specifies the subinterface on which ISL will be used.
Step 2
Router(config-if)# encapsulation
tr-isl trbrf-vlan vlanid bridge-num
bridge-number
Defines the encapsulation format, and specify the VLAN identifier.
Step 3
Router(config-if)# ip address
ip-address mask [secondary]
Specifies the IP address for the subnet on which ISL will be used.
Step 4
Router(config-if)# standby
[group-number] ip
[ip-address [secondary]]
Enables HSRP.