[j-nsp] BFD/IS-IS wait to re-establish adjacency after failure tweak knob?

[Mark Tinka]

On 19/May/16 00:53, Clarke Morledge wrote:

> I am trying to figure out the best way to configure an MX router, on
> an interface, to wait a specific time before it can re-establish an
> IS-IS adjacency, after an adjacency has been lost.
>
> Assume I am using BFD with reasonably short timers/multipliers to
> detect when an IS-IS adjacency fails, without changing the default
> IS-IS timers. I have a situation where a point-to-point link, with an
> L2 device in between, is sometimes losing the adjacency, as desired,
> due to BFD timers/mulipliers downing a session.
>
> However, the IS-IS adjacency is coming up more quickly than desired.
> On average, it is coming up 7-8 seconds later. Unfortunately, the L2
> link is still unstable, so the BFD causes the session to drop again
> fairly quickly. This causes a lot of flapping that I do not need.
>
> What is the appropriate JUNOS tweak knob to force IS-IS to wait a
> longer time on the unstable link, before trying to establish the
> adjacency?

You could dampen the interface until it is stable:

http://www.juniper.net/documentation/en_US/junos15.1/topics/concept/physical-interface-damping.html

Mark.