[190726] in North American Network Operators' Group
Re: MTU
daemon@ATHENA.MIT.EDU (Mark Tinka)
Sat Jul 23 01:40:55 2016
X-Original-To: nanog@nanog.org
To: Grzegorz Janoszka <Grzegorz@Janoszka.pl>, nanog@nanog.org
From: Mark Tinka <mark.tinka@seacom.mu>
Date: Sat, 23 Jul 2016 07:40:35 +0200
In-Reply-To: <520e997e-9c83-3d1c-b99b-b818e3ea3b16@Janoszka.pl>
Errors-To: nanog-bounces@nanog.org
On 22/Jul/16 19:37, Grzegorz Janoszka wrote:
>
>
> What I noticed a few years ago was that BGP convergence time was
> faster with higher MTU.
> Full BGP table load took twice less time on MTU 9192 than on 1500.
> Of course BGP has to be allowed to use higher MTU.
>
> Anyone else observed something similar?
Yes, of course. Larger MSS for BGP updates means fewer BGP updates
within which convergence can occur.
The problem is eBGP sessions are generally ran between different
networks, where co-ordinating MTU can be an issue.
Mark.
