[47778] in North American Network Operators' Group
Re: BGP and aggregation
daemon@ATHENA.MIT.EDU (Scott Granados)
Mon May 13 18:49:56 2002
Date: Mon, 13 May 2002 15:49:20 -0700 (PDT)
From: Scott Granados <scott@graphidelix.net>
To: Ralph Doncaster <ralph@istop.com>
Cc: Stephen Griffin <stephen.griffin@rcn.com>,
"nanog@merit.edu" <nanog@merit.edu>
In-Reply-To: <Pine.LNX.4.21.0205131830230.25285-100000@cpu1693.adsl.bellglobal.com>
Message-ID: <Pine.LNX.4.33.0205131549060.25643-100000@penguin.graphidelix.net>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Errors-To: owner-nanog-outgoing@merit.edu
set your mtu on your gre's to 1514
On Mon, 13 May 2002, Ralph Doncaster
wrote:
>
> > > I was thinking of doing iBGP over my transit connections (with a couple
> > > of static routes so the iBGP works) AND over my inter-city circuit. Any
> > > reason why this won't work?
> > >
> > > -Ralph
> >
> > The loss of igp metric will make it untenable at best. Do it over a
> > GRE tunnel, with your regular igp (isis, ospf, eigrp, or shudder rip).
>
> As far as I can tell, GRE doesn't support fragmentation -
> i.e. encapsulation of a 1500-byte IP packet that results in a GRE packet
> larger than the interface MTU size.
>
> -Ralph
>
>
