[Idr] draft-merciaz-idr-bgp-bfd-strict-mode

"Albert Fu (BLOOMBERG/ 120 PARK)" <afu14@bloomberg.net> Thu, 25 July 2019 20:19 UTC

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Date: Thu, 25 Jul 2019 20:19:00 -0000
From: "Albert Fu (BLOOMBERG/ 120 PARK)" <afu14@bloomberg.net>
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Subject: [Idr] =?utf-8?q?draft-merciaz-idr-bgp-bfd-strict-mode?=
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I am in support of this draft, and would like to request a small change to make this draft more operationally useful.

We have encountered several traffic blackhole problems in our production network without this feature. As such, we have deployed BGP with strict BFD mode on a proprietary vendor implementation for a while.
Since a lot of MetroE circuit failures occur with interfaces still up, ie. break in the middle issues, the traditional knobs like interface hold-time/debounce timer can not be used to dampen interface flaps. 

We have observed that interface issues tend to occur in bursts and would like to request that an option be added in "Section 4 Operation:" to delay BGP from coming up until BFD is proven stable continuously for a period of time (i.e. BFD hold up feature). 

This is a feature that we are currently using in the proprietary vendor deployment. In our case, since we have multiple redundant paths, we have some links where we delay BGP from coming up until BFD has been stable continuously for 60 seconds.

Albert Fu