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