[j-nsp] bfd = busted failure detection :)

[Ross Vandegrift]

On Fri, Dec 04, 2009 at 02:40:14PM -0600, Richard A Steenbergen wrote:
> FYI I found the root problem and hereby take back any comments impugning
> BFD's reputation. It turns out there actually WAS some kind of pfe bug
> which was causing intermittent blackholing of traffic for a few seconds
> at a time at seemingly random intervals several times a day. Ping from
> the affected devices didn't catch the issue becuase of the re->pfe
> forwarding path, only traffic routed entirely via pfe was being
> affected. BFD was actually doing its job and detected the failures that
> were too short to be noticed by normal routing protocols. I discovered
> the issue on several MX960s (mostly running 9.2R4, but one pair was
> running 9.4R3), and upgrading them to 9.5R3 seems to solve it (or
> perhaps it was just the pfe rstart that did it, remains to be seen).

Is there a PR number for this issue?  Sounds like it could be a drag.

Ross

-- 
Ross Vandegrift
ross at kallisti.us

"If the fight gets hot, the songs get hotter.  If the going gets tough,
the songs get tougher."
	--Woody Guthrie
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