The only way to effectively check out the transformer is by performing a continuity check.
2.
Fast link failure detection may be performed using IEEE 802.1ag Continuity Check Messages ( CCMs ) which test link status and report a failure to the IS-IS protocol.
3.
In case of work path failure ( as indicated by loss of 802.1ag continuity check messages, CCMs ) the source bridge swaps the B-VID value to redirect the traffic onto the preconfigured protection path within 50 ms.
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