L2 MTU issues - is BFD proper solution?

Ondrej Zajicek santiago at crfreenet.org
Fri Jul 4 12:09:14 CEST 2014

On Thu, Jul 03, 2014 at 11:43:39AM +0200, Bartosz Radwan wrote:
> We experienced recently several times issues caused by eg. EAPS path  
> swich in one of our L2 transmission providers (new path MTU was not big  
> enough due to jumbo frames not enabled - that's what they told us, but  
> in fact it does not meter - it's out of our control).
> From our point of view this situation sucks - we have several BGP  
> sessions, terminated on 2 different BGP routers in different data  
> centers, but problems as descripbed above in just one L2 provider  
> network may cause our all services are not fully operational -  
> especially when afeccted BGP sessions provides best routes for some  
> popular services like FB, YT or??? redtube.com ;).
> So, the question: is BFD able to detect broken L2 MTU and if detected -  
> disable affected BGP sessions?

No. BFD sessions use very small packets, so they most likely do not
notice problems specific to MTU.

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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