9-28 Cisco BPX 8600 Series Reference
Checking and Troubleshooting
Step 8 Try a ping on the tag switch connections. If the ping doesn't work, but all the tag switching
and routing configuration looks correct, check that the TSC has found the VSI interfaces
correctly by entering the following command at the TSC:
tsc# show tag int
Step 9 If the interfaces are not shown, re-check the configuration of port 4.1 on the BPX switch
as described in the previous steps.
Step 10 If the VSI interfaces are shown, but are down, check whether the TSRs connected to the
BPX switch show that the lines are up. If not, check such items as cabling and
connections.
Step 11 If the TSCs and BPX switch show the interfaces are up, but the TSC doesn't, enter the
following command on the TSC:
tsc# reload
Step 12 If the “show tag int” shows that the interfaces are up, but the ping doesn't work, enter the
follow command at the TSC:
tsc# sho tag tdp disc
The resulting display should show something similar to the following:
Local TDP Identifier:
30.30.30.30:0
TDP Discovery Sources:
Interfaces:
ExtTagATM2.1: xmit/recv
ExtTagATM3.1: xmit/recv
-----------------
Step 13 If the interfaces on the display show “xmit” and not “xmit/recv”, then the TSC is sending
TDP messages, but not getting responses. Enter the following command on the
neighboring TSRs.
tsc# sho tag tdp disc
If resulting displays also show “xmit” and not “xmit/recv”, then one of two things is
likely:
(a) The TSC is not able to set up VSI connections
(b) The TSC is able to set up VSI connections, but cells won't be transferred because
they can't get into a queue
Step 14 Check the VSI configuration on the switch again, for interfaces 4.1, 4.2, and 4.3, paying
particular attention to:
(a) maximum bandwidths at least a few thousands cells/sec
(b) qbins enabled
(c) all qbin thresholds non-zero
Note VSI partitioning and resources must be set up correctly on the interface connected to the TSC,
interface 4.1 in this example, as well as interfaces connected to other tag switching devices.
