Avaya Troubleshooting Routers Guia de Resolução de Problemas descarregar pdf (Página 100)

Troubleshooting Routers

5-22

• You conﬁgured the DTE/DCE (Data Terminal Equipment/Data

Communication Equipment) with promiscuous mode turned on.

The remote loopback test allows data to leave the router, cross the synchronous

circuit to the remote CSU/DSU, and come back to the router.

If the transmission and reception statistics increment without errors, perform the

local and remote loopback tests at the remote side.

If the local loopback test did not cause any error count to be incremented, but the

remote loopback test did, request that the carrier test the line and remote

CSU/DSU.

If the local loopback test causes the error counts to continue to increment,

complete one of the following procedures in order to isolate the problem:

• Disconnect the cable from the port of the router reporting the errors and plug

it into another port on the router that you know works correctly.

If the synchronous errors persist, verify that you properly conﬁgured the

newly tested port, test the cable, and test the local CSU/DSU.

If the errors go away, compare the newly tested port’s conﬁguration to that of

the original port. If the port conﬁgurations are the same, try swapping the link

module that has the original port with a new link module.

• Or, connect the port of the router reporting the errors to another CSU/DSU

and monitor the line statistics.

If the errors persist, try another cable. If errors continue to persist, try

swapping the link module with a new one.

Caution: Do not do loopback testing on a synchronous port during

production network time if the bridge is operating on that port.

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