Re: BGP and aggregation

[Scott Granados <scott () graphidelix net>]

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