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Configuring Token Ring Inter-Switch Link
Monitoring TRISL Statistics
BC-153
Cisco IOS Bridging and IBM Networking Configuration Guide
78-11737-02
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:
Monitoring TRISL Statistics
You can collect, clear, and display statistical information about the network.
The Duplicate Ring Protocol (DRiP) runs on Cisco routers and switches that support switched VLAN
networking and is used to identify active Token Ring VLANs (TrCRFs).
DRiP maintains the status of TrCRFs and uses this information to determine whether there are multiple
TrCRFs active in a TrBRF.
DRiP information is used for the following:
• All-routes explorer filtering
DRiP information is used in conjunction with the local configuration to determine which of the
TrCRFs configured within a TrBRF have active ports. This information is used on the base switch
to correctly filter all-routes explorers and on the ISL module to discard AREs that have already been
on an attached ring.
• Detecting the configuration of duplicate TrCRFs across routers and switches, which would cause a
TrCRF to be distributed across ISL trunks
DRiP information is used in conjunction with the local configuration information to determine
which TrCRFs are already active on the switches. If a TrCRF is enabled on more than one switch or
router, the ports associated with the TrCRF are disabled on all switches. A router will not disable
the internal ring used for SRB and for routing source-routed traffic. Instead, the router generates the
following error message to indicate that two identical TrCRFs exist:
DRIP conflict with CRF <vlan-id>
To show or clear DRiP or VLAN statistics, use one or all the following command in privileged EXEC
mode:
Note When DRiP counters are cleared, the counter is reset to 0. Incrementing of DRiP counters indicates
that the router is receiving packets across the TrBRF.
Command Purpose
Router(config-if)# source-bridge
spanning bridge-group
Enables the automatic spanning-tree function on a group of bridged interfaces.
Command Purpose
Router# clear drip counters
Clears DRiP counters.
Router# clear vlan statistics
Removes VLAN statistics from any statically configured or system
configured entries.
Router# show drip
Displays DRiP information.
Router# show vlans
Displays a summary of VLAN subinterfaces.