Configuring Static BFD to Detect the Connectivity of a VPLS SS-PW
This section describes how to configure static bidirectional forwarding detection (BFD) to detect the connectivity of a virtual private LAN service (VPLS) single-segment pseudo wire (SS-PW).
Usage Scenario
If provider edge devices (PEs) on a Multiprotocol Label Switching (MPLS) Layer 2 virtual private network (L2VPN) communicate over pseudo wires (PWs), service protection can be enhanced by configuring static BFD to detect PW connectivity.
Pre-configuration Tasks
Before you configure static BFD to detect the connectivity of a VPLS SS-PW, complete the following tasks:
Configure network-layer parameters for devices on the MPLS L2VPN to ensure reachability between nodes.
Configure a VPLS SS-PW.
Procedure
- Run system-view
The system view is displayed.
- Run bfd
BFD is enabled globally and the global BFD view is displayed.
- Run quit
Return to the system view.
- Create BFD configurations based on the networking.
Create a BFD session for VPLS PW.
Run bfd session-name bind pw vsi vsi-name peer peer-address [ vc-id vc-id ] [ remote-peer remote-peer-address pw-ttl { auto-calculate | ttl-number } ]
BFD configuration items are created.
- Configure BFD session discriminators:
Run discriminator local discr-value
A local discriminator is configured.
Run discriminator remote discr-value
A remote discriminator is configured.
The local discriminator on one end of a BFD session must be the same as the remote discriminator on the other end of the BFD session.
- Run commit
The configuration is committed.
If the PW to be detected is in the Down state, the BFD session can be established but the BFD session cannot go Up.
- BFD configurations on the end PEs of a PW must be consistent. Otherwise, the PW status on the end PEs may be inconsistent.
If you want to modify the parameters of an existing BFD session, run corresponding commands, such as min-tx-interval, min-rx-interval, and detect-multiplier.
Verifying the Configuration
Run the display bfd session command.
The command output shows information about the BFD session status, BFD session discriminators, BFD session type, and type of the PW bound to the BFD session.