Association between Ethernet Connectivity Fault Management (CFM) and Ethernet Ring Protection Switching (ERPS) on a port added to an ERPS ring accelerates fault detection, implements fast convergence, and shortens traffic interruptions.
Before configuring association between ERPS and Ethernet CFM, configure basic CFM functions on the port added to the ERPS ring. For details, see Configuring Basic Ethernet CFM Functions in "CFM Configuration" in the S2720, S5700, and S6700 V200R019C10 Configuration Guide - Reliability.
The system view is displayed.
The interface view is displayed.
ERPS is associated with Ethernet CFM to fast detect link failures.
The association between ERPS and CFM takes effect only when the interface has ERPS associated with CFM and has an interface-based MEP created using the mep mep-id command.
After ERPS is associated with Ethernet CFM, ensure that the maintenance entity group level (MEL) value of Ring Auto Protection Switching (RAPS) Protocol Data Units (PDUs) in ERPS rings is larger than the MEL value in CFM protocol packets. Otherwise, Ethernet CFM cannot allow RAPS PDUs to pass through. The MEL value can be used for interworking with other vendors' devices in an ERPS ring. The same MEL value ensures smooth communication between devices.
You can run the raps-mel level-id command in the ERPS ring view to set the MEL value in RAPS PDUs.
By default, the MEL in RAPS PDUs is 7.