Re: Parallel EBGP sessions and RFC1771 collision detection.

From: Rafi Sadowsky (rafi@meron.openu.ac.il)
Date: Fri Nov 26 1999 - 08:24:14 EST


On Fri, 26 Nov 1999, Jesper Skriver wrote:

> On Fri, Nov 26, 1999 at 01:51:39PM +0100, Christian Panigl, ACOnet/UniVie wrote:
> > >Date: Thu, 25 Nov 1999 19:47:18 +0100
> > >From: Alex Bligh <amb@gxn.net>
> > >
> > >This should be an easy question:
> > >
> > >Can I safely maintain a two EBGP between two routers (A and B) if
> > >I use different interfaces on each router? This appears to work in
> >
> > Hi Alex,
> >
> > did you get an answer already ? I don't see any problem with this. But
> > probably what you'd prefer is "EBGP Multihop (Load Balancing)", with just
> > one EBGP session but traffic load-sharing onto two (or more) lines between
> > two routers.
> >
> > Please refer to "BGP4 Case Studies/Tutorial, Section 1":
> >
> > http://www.cisco.com/warp/public/459/13.html
> >
> > or, general Cisco "BGP Technical Tips" at:
> >
> > http://www.cisco.com/warp/public/459/18.html
>
> That won't work if the 2 media's are multiaccess media's, there you
> cannot rely on static routes to become invalid if the next-hop goes
> away.
what about running an IGP instead of using statics ?
>
> Such a situation can appear in London, where quite a few peer over both
> LoNap and LINX, both located at Telehouse London.
>
> /Jesper
>
>



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