What are the functions and typical scenarios of BFD and interface status association

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Using the process-interface-status command in the BFD session view, you can enable interface status association. When the BFD session status changes, the Line protocol current state is Up (BFD Status Down) when you run the display this interface command on the interface. At the same time, the RM withdraws the host routes and network segment routes on the interface.

Application scenario: BFD for IFNET is usually applied to the scenario where a Layer 2 device exists between two routers, or there are transmission devices, or a single fiber fault occurs.

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What are the functions and typical scenarios of BFD and interface status association
Using the process-interface-status command in the BFD session view, you can enable interface status association. When the BFD session status changes, the Line protocol current state is Up (BFD Status Down) when you run the display this interface command on the interface. At the same time, the RM withdraws the host routes and network segment routes on the interface. Application scenario: BFD for IFNET is usually applied to the scenario where a Layer 2 device exists between two routers, or there are transmission devices, or a single fiber fault occurs.

Why can association between BFD session status and interface status on S series switches be used only on multicast BFD sessions
For S series switches, a multicast BFD session uses multicast packets and is not affected by the protocol status on an interface. When the BFD session goes Down and the protocol status on the interface changes to BFDSatusDown, multicast BFD packets can still be sent. After the link recovers, the multicast BFD session becomes Up after negotiation. As a result, the interface is unlocked and becomes Up. Unicast packets, however, cannot be sent or received after the protocol status on the interface goes Down, which causes deadlock.

BFD and VRRP association on S series switch
For details about BFD for VRRP configuration on an S series switch, except S1700, see Example for Configuring Association Between VRRP and BFD to Implement a Rapid Active/Standby Switchover in the S1720&S2700&S3700&S5700&S6700&S7700&S9700 Typical Configuration of Typical Features.The configurations on all models are the same.

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