Troubleshooting "Optional attribute error"

[Ondrej Zajicek]

On Fri, May 06, 2011 at 08:34:07PM +0200, Daniel Suchy wrote:
> On 05/06/2011 01:50 AM, Ondrej Zajicek wrote:
> > There are (AFAIK) only two things that may generate such error - malformed
> > NLRI or its next hop attribute. Also NLRI of unexpected kind (like IPv4 in
> > bird6). Perhaps the other side sends both IPv4 and IPv6 in one session?
> 
> Just a note - we had similar issue caused by IPv6 prefix originated
> somewhere (we also have full BGP). In our setup, BGP communities was not
> filtered and additionaly, metric was set. If there was high ammount of
> the communities and metric was set, in this case Cisco router malformed
> update packet - there was empty NLRI sent out...

We found that in this case it was also a problem on the other side, which
send malformed packets - NLRI was smaller that needed and one prefix in
it was truncated (just two bytes for /48 prefix). Unfortunately, i don't
know yet type and version of the other side.

-- 
Elen sila lumenn' omentielvo

Ondrej 'SanTiago' Zajicek (email: santiago at crfreenet.org)
OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
"To err is human -- to blame it on a computer is even more so."
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