Hi, thank you for your report.
Can you please apply this fix and verify that the behaviour is now correct? https://gerrit.fd.io/r/c/vpp/+/24388 Thanks, Klement > On 17 Jan 2020, at 07:04, sont...@gmail.com wrote: > > 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. 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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