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 |
Step 1 | | |
Router(config)# source-bridge ring-group vring-num | Configures a virtual ring for the router. |
Step 2 | | |
Router(config)# source-bridge transparent ring-group | Enables bridging between transparent bridging and |
| pseudoring bridge-number tb-group [oui] | source-route bridging. |
Step 3 | | |
Router(config)# interface type | Specifies the subinterface on which TRISL will be |
| slot/port.subinterface-number | used. |
Step 4 | | |
Router(config-if)#encapsulation tr-isl trbrf-vlan | Defines the encapsulation for TRISL. |
| vlanid bridge-numbridge-number | |
Step 5 | | |
Router(config-if)#source-bridge trcrf-vlan vlanid | Assigns a VLAN ID to the router’s virtual ring. |
| ring-group ring-number | |
| | |
Note For a complete description of SR/TLB, including configuring translation compatibility with IBM 8209 bridges and configuring Token Ring LLC2 to Ethernet Type II (0x80d5) and Token Ring LLC2 to Ethernet 802.3 LLC2 (standard) translations, please refer to the “Configuring Source-Route Bridging” chapter in this publication and “Source-Route Bridging Commands” chapter in the Cisco IOS Bridging and IBM Command Reference (Volume 1 of 2).
Configuring Automatic Spanning Tree
The automatic spanning-tree function supports automatic resolution of spanning trees in SRB networks, which provides a single path for spanning explorer frames to traverse from a given node in the network to another. Spanning explorer frames have a single-route broadcast indicator set in the routing information field. Port identifiers consist of ring numbers and bridge numbers associated with the ports. The spanning-tree algorithm for SRB does not support Topology Change Notification Bridge Protocol Data Unit (BPDU).
Although the automatic spanning-tree function can be configured with Source-Route Translational Bridging (SR/TLB), the SRB domain and transparent bridging domain have separate spanning trees. Each Token Ring interface can belong to only one spanning tree. Only one bridge group can run the automatic spanning-tree function at a time.
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:
Command | Purpose |
| |
Router(config)# bridge bridge-group | Creates a bridge group that runs the automatic spanning-tree function. |
protocol ibm | |
| |
| Cisco IOS Bridging and IBM Networking Configuration Guide |
BC-152 | 78-11737-02 |
