North American Network Operators Group
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Re: BGP and aggregation

  • From: Scott Granados
  • Date: Mon May 13 18:51:58 2002 
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
> 
>