Description

In micro BFD, when using interface IP as local/neighbor address if there is a interface flap, MicroBFD remains "down" even if the physical link is "up".

Symptoms

Using interface IP for microBFD as below:

Example: 

    bfd-liveness-detection {
        version 1;
        minimum-receive-interval 100;
        multiplier 3;
        no-adaptation;
        transmit-interval {
            minimum-interval 100;
        }
        neighbor 129.1.1.2;
        local-address 129.1.1.1; 
    }

Solution

Platform limitation.

PTX has a platform limitation and needs to use only loopback IP as Micro BFD Local/Neighbor Address.

Modification History

2020-02-09: Updated cause and solution to state that this is a platform limitation.