Usage Scenario
On a VPLS network, to speed up link fault detection, run the bfd-detect command to configure a dynamic BFD session to monitor a VPLS PW. If a VPLS PW to be monitored goes Up, the device informs the BFD module of peer information and detection parameters so that the BFD module can establish a BFD session. Upon the session establishment, BFD starts to monitor the VPLS PW. If the primary PW fails, BFD allows service traffic to be quickly switched to the secondary PW, ensuring the service quality.
Virtual circuit connectivity verification (VCCV) is an E2E PW fault detection and diagnosis mechanism. VCCV is a control channel used to send connection verification messages between the ingress and egress of a PW. VCCV control channels working in label alert mode or control word modes. The label alert mode is used by default. To check the connectivity of a VPLS PW, run the
control-word enable command to enable the control word detection function.
Prerequisites
BFD has been globally enabled using the bfd command.
Precautions
Static BFD for VPLS PW and dynamic BFD for VPLS PW are mutually exclusive. A VPLS PW can have either a static or dynamic BFD session configured.
You do not have to specify any dynamic BFD parameters when running the
undo bfd-detect command. If a BFD parameter is specified, the specified parameter value must be the same as the configured parameter value so that the BFD configuration can be deleted.