Hi, I have observed an incorrect behavior in BFD code of VPP. I have brought BFD session UP between VPP and peer router. Due to interface shutdown on peer router BFD session on VPP goes to DOWN state. Once it goes to DOWN state, it is continuously sending control packets using its old remote discriminator in its control packet's "Your Discriminator" field. This is a wrong behavior. Below RFC section tells that once BFD goes DOWN due to non-receipt of BFD control packet, "Your Discriminator" field should be set to zero.
RFC 5880 6.8.1 ( https://tools.ietf.org/html/rfc5880#section-6.8.1 ). State Variables bfd.RemoteDiscr The remote discriminator for this BFD session. This is the discriminator chosen by the remote system, and is totally opaque to the local system. This MUST be initialized to zero. If a period of a Detection Time passes without the receipt of a valid, authenticated BFD packet from the remote system, this variable MUST be set to zero.
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