Configuring Dynamic BFD for LDP LSPs

Dynamic bidirectional forwarding detection (BFD) for LDP LSPs is used to rapidly check LDP LSP connectivity to improve network reliability.

Usage Scenario

Dynamic BFD for LDP LSPs detects link faults rapidly and reduces configuration workloads. It can be used together with LDP FRR to reduce the impact of link faults on services.

Note that dynamic BFD can be used to check LDP LSPs established only using host routes.

Pre-configuration Tasks

Before configuring dynamic BFD for LDP LSPs, complete the following tasks:

Configure network layer parameters to implement network layer connectivity.
Enable MPLS LDP on each node and establish an LDP session.
Configure an LDP LSP.

Enabling BFD Globally: BFD-related configurations can be performed only after BFD is enabled globally.

Enabling Dynamic BFD Session Creation over an LDP LSP: A dynamic BFD session can be created over an LDP LSP after BFD is enabled on both ingress and egress of the LDP LSP.

Configuring a Policy for Triggering Dynamic BFD for LDP LSPs: A BFD session can be created to monitor an LDP LSP only after a policy for triggering dynamic BFD is configured.

(Optional) Modifying BFD Parameters: BFD parameters, such as BFD detection intervals and detection multipliers, can be modified.

Verifying the Configuration of Dynamic BFD for LDP LSP: After configuring dynamic BFD for LDP LSP, you can view BFD configurations and session information on the ingress and egress of a specified LDP LSP.