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

[Spyros Kakaroukas]

Hey,

We offer it when customers request it, though demand for it is pretty low. We also use it on multi-homed managed CEs.

Just make sure that your platforms ( some can offload it ) and links can handle the amount of sessions and timers you're using. Depending on your use case and link speed, you may want to set up a bandwidth reservation for BFD packets, or even put them inside a LLQ .

Remember that unless business requirements call for super-fast convergence, making a network notice and react to failures as fast as  possible isn't the best of ideas. Some IGP/BGP timers might be a bit on the high side, but just because you're deploying BFD, it doesn't mean you have to be really aggressive with the timers. Looking at IP event dampening of BFD dampening ( if your gear supports it ) might also prove useful.

My thoughts and words are my own.

Kind Regards,

Spyros
-----Original Message-----
From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Eric Louie
Sent: Thursday, October 6, 2016 12:48 AM
To: CiscoNSP <cisco-nsp at puck.nether.net>
Subject: [c-nsp] BFD on customer-facing interfaces - experiences

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)?

thanks, Eric
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