Did your BGP crash today?

Dave Israel davei at otd.com
Fri Aug 27 14:33:38 CDT 2010


On 8/27/2010 3:22 PM, Jared Mauch wrote:
> When you are processing something, it's sometimes hard to tell if something
> just was mis-parsed (as I think the case is here with the "missing-2-bytes")
> vs just getting garbage.  Perhaps there should be some way to "re-sync" when
> you are having this problem, or a parallel "keepalive" path similar to
> MACA/MCAS/MIDCAS/TCAS between the devices to talk when something bad is
> happening.

I know it wasn't there originally, and isn't mandatory now, but there is
an MD5 hash that can be added to the packet.  If the TCP hash checks
out, then you know the packet wasn't garbled, and just contained
information you didn't grok.  That seems like enough evidence to be able
to shrug and toss the packet without dropping the session.

-Dave






More information about the NANOG mailing list