Cisco 15327 - Manual (Page 356)

21-12
Ethernet Card Software Feature and Configuration Guide, R7.2
Chapter 21 Configuring RMON
Unwrap Synchronization
Figure 21-5 First Stage of Unwrapped Cisco proprietary RPR with Bidirectional Excessive CRC
Errors
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
Figure 21-5 .
User issues
unwrap command.
Node B
Node C