Routing

Hi All - I need a simple clarification about BFD.  Consider the following simple configuration:

[edit protocols bgp]

group test {

    type external;

    export test-policy;

    bfd-liveness-detection {

        minimum-interval 100;

         }

    neighbor 5.5.5.5;

}

Assuming both peers are configured this way, they each send BFD control packets at ~100ms intervals.  Does each router actually send a reply back to its peer for each of these control packets, or does it just make sure it is receiving control packets from its peer at the correct intervals?  I've read about echo mode, but not sure if that is supported by JUNOS or not. 

So to detect a failure, will a Juniper router drop the BFD session if it stops receiving the control packets originated by it's peer, or is it looking for actual replies from its peer (like an icmp echo reply)?

Thanks in advance for any feedback!

Hello,

BFD Echo Mode is not supported in JUNOS.

And yes, a Juniper router will drop BFD session if no control packets are received from peer.

HTH

Thanks
Alex

Thanks for the reply - so one peer doesn't reply to the other peer's control packets, correct?

Hello,

If Async mode is configured on both peers then no.

HTH

Thanks

Alex

The same issue...

Any new ideas?