Configuring Token Ring Inter-Switch Link
TRISL Configuration Task List
BC-151
Cisco IOS Bridging and IBM Networking Configuration Guide
78-11737-02
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:
Configuring Source-Route Bridging over TRISL
To configure SRB over TRISL, use the following commands beginning in global configuration mode:
Configuring Source-Route Transparent Bridging over TRISL
To configure transparent bridging over TRISL, use the following command beginning in global
configuration mode:
Command Purpose
Step 1
Router(config-if)# multiring
trcrf-vlan vlanid
trcrf-ring
ring-number
Creates a pseudoring to terminate the RIF and assign 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)# source-bridge
ring-group vring-num
Configures a virtual ring for the router.
Step 2
Router(config)# interface type
slot/port.subinterface-number
Specifies the subinterface on which TRISL will be used.
Step 3
Router(config-if)# encapsulation
tr-isl trbrf-vlan vlanid bridge-num
bridge-number
Defines the encapsulation for TRISL.
Step 4
Router(config-if)# source-bridge
trcrf-vlan vlanid ring-group
ring-number
Attaches a TrCRF VLAN identifier to the router’s virtual ring.
Command Purpose
Step 1
Router(config)# interface type
slot/port.subinterface-number
Specifies the subinterface on which TRISL will be used.
Step 2
Router(config-if)# encapsulation
tr-isl trbrf-vlan vlanid bridge-num
bridge-number
Defines the encapsulation for TRISL.
Step 3
Router(config-if)# bridge-group
bridge-group number
Specifies the bridge group to which the TRISL subinterface belongs.
