[c-nsp] BFD on customer-facing interfaces - experiences

[Eric Louie]

Adam, thank you for those heads ups.

Eric

On Thu, Oct 6, 2016 at 1:07 AM, Adam Vitkovsky <Adam.Vitkovsky at gamma.co.uk>
wrote:

> > Eric Louie
> > Sent: Wednesday, October 05, 2016 10:48 PM
> >
> > We're looking for any ISPs who have experience with BFD configured on
> > customer-facing interfaces (OSPF or BGP). Was it reliable? Did it cause
> too
> > many false positives for down routing sessions? What about
> re-establishing
> > the routing protocol when BGD recovers? Did you have issue with root
> cause
> > analysis when the sessions dropped (as in explaining to the customers why
> > their routing session went down or flapped)?
> >
> Regarding false positives,
> Might want to check whether on your platform of choice the BFD is
> offloaded to HW (i.e. not being handled by the CPU on RE).
> Might want to run some scaling testing to see how many BFD sessions and
> with what timers can be run concurrently in your specific setup (note the
> scaling numbers provided by vendors are unidimensional).
>
> Regarding flapping,
> Might want to use interface state dampening (i.e. wait 0s to transition
> interface to down state and wait e.g. 60s so see if the link is stable and
> only then transition to protocol up state).
>
> adam
>
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> Adam Vitkovsky
> IP Engineer
>
> T: 0333 006 5936
> E: Adam.Vitkovsky at gamma.co.uk
> W: www.gamma.co.uk
>
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