Configuring a BFD for Link-Bundle Session to Detect Eth-Trunk Member Link Faults

You can configure a BFD for link-bundle session to monitor Layer 3 Eth-Trunk member links and rapidly detect link faults.

Usage Scenario

When two devices are connected over a Layer 3 Eth-Trunk, you can configure a BFD for link-bundle session to detect link faults.

If there is a Layer 2 transmission device, you can also use a BFD for link-bundle session to detect faults on the link between the two devices.

After a BFD for link-bundle session is bound to an Eth-Trunk interface, the system creates a dynamic unicast BFD sub-session for each Eth-Trunk member interface. Each sub-session independently negotiates and monitors the link status and reports the monitored link status. The system also creates a main session, which processes the link status reported by the sub-sessions and reports its status to the APP. The main session goes Down only when all sub-sessions go Down.

Pre-configuration Tasks

Before configuring a BFD for link-bundle session to detect Eth-Trunk member link faults, complete the following tasks:

Configure a Layer 3 Eth-Trunk interface and ensure that the link layer protocol on the interface is Up.
Assign an IP address to the Layer 3 Eth-Trunk interface and ensure that the Layer 3 protocol on the interface is Up.

Enabling BFD Globally: BFD must be enabled globally before BFD is configured.

Creating a BFD for Link-Bundle Session: BFD for link-bundle sessions is used to detect faults on Layer 3 Eth-Trunk member links.

(Optional) Changing the BFD Detection Time: You can change the BFD detection time to more efficiently use a BFD session to monitor links on a network.

(Optional) Setting the BFD WTR Time: You can set the BFD wait to restore (WTR) time to prevent an application from switching between the master and slave devices due to BFD session flapping.

(Optional) Configuring a Priority of a BFD Session: This section describes how to configure a priority for a BFD session.

Verifying the Configuration of BFD for Link-Bundle Session to Detect Eth-Trunk Member Link Faults: After configuring a BFD for link-bundle session to detect Eth-Trunk member link faults, verify the configurations.