Configuring Basic Detection Functions

This section describes how to configure proper MPLS OAM parameters on both ends of a PW for network loads.

Context

Perform the following steps on both ends:

Procedure

Run system-view
The system view is displayed.
Run mpls
The MPLS view is displayed.
Run mpls oam
MPLS OAM is globally enabled.
Run quit
Return to the system view.
Run mpls-oam
The MPLS-OAM view is displayed.
Run mpls oam l2vc peer-ip peer-ip vc-id vc-id vc-type vc-type [ remote-peer-ip remote-peer-ip remote-vc-id remote-vc-id remote-vc-type remote-vc-type ] type { cv | ffd frequency {3|10|20|50|100|200|500} } [ auto-protocol [ overtime overtime ] ] [ compatibility-mode { compati-mode-val ] [ bdi-frequency bdi-freq-val ] [ exp exp-value ]
MPLS OAM parameters are configured on the node at each end of a PW.
- If OAM auto protocol extension is enabled in Step 6, Step 7 does not need to be performed. When OAM auto protocol extension is enabled, a device automatically sends or receives OAM detection packets.
- After receiving the first CV or FFD packet, the egress automatically records OAM parameters, such as the detection packet type and interval at which detection packets are sent. The egress then uses these parameters to monitor link connectivity.
- The same compatibility mode must be set to ensure interworking between different products.
- When OAM auto protocol extension is enabled, the compatibility-mode parameter must be set to the same value on the local and peer devices.
(Optional) Run mpls oam l2vc enable { send | receive } peer-ip peer-ip vc-id vc-id vc-type vc-type
MPLS OAM is enabled on the node at each end of the PW.
(Optional) Run mpls oam l2vc loss-measure oam-packet loss-ratio { threshold1 threshold1-value | threshold2 threshold2-value } ^* peer-ip peer-ip vc-id vc-id vc-type vc-type
The packet loss alarm threshold of OAM packets is set.
(Optional) Run mpls oam l2vc lost-measure single-ended proactive [ exp exp-value ] peer-ip peer-ip vc-id vc-id vc-type vc-type
The single-ended packet loss measurement of PW MPLS OAM is enabled.
(Optional) Run mpls oam l2vc delay-measure two-way proactive [ exp exp-value | packet-size packet-size-value [ padding-value { 0 | 1 } ] ] ^* peer-ip peer-ip vc-id vc-id vc-type vc-type
The proactive PW two-way delay measurement is enabled.
Run commit
The configuration is committed.

Exception Handling

If the transmit end has FFD configured and the receive end has auto-protocol configured, the receive end receives FFD packets at the interval that the transmit end sends packets. After the following operations are performed, an unknown alarm is automatically reported and cannot be cleared:

Run the shutdown command on the service interface of the receive end to disable services.
Run the mpls oam l2vc command on the transmit end to modify frequency ffd-fre.
Run the undo shutdown command on the service interface of the receive end to enable services. Then, the receive end will receive FFD packets at an interval different from the locally recorded one.

In this situation, run the undo mpls oam l2vc enable command on the transmit end to disable FFD. Then, reconfigure FFD.