Continuity Check Protocol
The continuity check protocol is used for fault detection by a MEP within a maintenance association. The MEP periodically sends continuity check multicast messages. The receiving MEPs use the continuity check messages to build a MEP database of all MEPs in the maintenance association.
The continuity check protocol packets use the ethertype value 0x8902 and the multicast destination MAC address 01:80:c2:00:00:32.
Configuring the Continuity Check
You can configure the following continuity check protocol parameters:
- hold-interval minutes
- interval time
- loss-threshold number
To enable the continuity check protocol, include the continuity-check statement at the [edit protocols oam ethernet connectivity-fault-management maintenance-domain domain-name maintenance-association ma-name] hierarchy level.
Configuring the Continuity Check Hold Interval
You can specify the continuity check hold interval. The hold interval is the number of minutes to wait before flushing the MEP database if no updates occur. The default value is 10 minutes.
To configure the hold interval, include the hold-interval statement at the [edit protocols oam ethernet connectivity-fault-management maintenance-domain domain-name maintenance-association ma-name continuity-check] hierarchy level.
Configuring the Continuity Check Interval
You can specify the continuity check message (CCM) interval. The interval is the time between the transmission of CCMs. You can specify 10 minutes (10m), 1 minute (1m), 10 seconds (10s), 1 second (1s), 100 milliseconds (100ms), or 10 milliseconds (10ms). The default value is 1 minute.
 | Note: For the continuity check message interval to be configured for 10 milliseconds, periodic packet management (PPM) runs on the Routing Engine and Packet Forwarding Engine (PFE) by default. You can only disable PPM on the PFE. To disable PPM on the PFE, use the no-delegate-processing statement at the [edit routing-options ppm] hierarchy level. |
To configure the interval, include the interval statement at the [edit protocols oam ethernet connectivity-fault-management maintenance-domain domain-name maintenance-association ma-name continuity-check] hierarchy level.
Configuring the Continuity Check Loss Threshold
You can specify the number of continuity check messages that can be lost before marking the MEP as down. The default value is three (PDUs).
To configure the loss threshold, include the loss-threshold statement at the [edit protocols oam ethernet connectivity-fault-management maintenance-domain domain-name maintenance-association ma-name continuity-check] hierarchy level.
