Figure 21-5 First Stage Of Unwrapped Cisco Proprietary Rpr With Bidirectional Excessive Crc Errors - Cisco ONS 15454 SDH Configuration Manual

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Unwrap Synchronization

Node E has not unwrapped POS port 1 after the first CRC-ALARM clear command. Since node D

continues to send PDI to node E, node E will raise the TPTFAIL alarm once the CRC-ALARM is cleared.

At this point, the Cisco proprietary RPR is in a state similar to the unidirectional failure. The unwrap

completes after the user issues the second unwrap command, as illustrated by

Cisco ONS 15454 and Cisco ONS 15454 SDH Ethernet Card Software Feature and Configuration Guide, R8.0

First Stage of Unwrapped Cisco proprietary RPR with Bidirectional Excessive CRC

unwrap command.

Chapter 21 Configuring RMON