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Re: Portable IP space, isolated networks, BGP, etc... (fwd)

  • From: Daniel Golding
  • Date: Thu Dec 09 20:51:11 1999


It's not necessary to mesh your BGP speakers - only a good idea. As long
as you don't care about sharing routing information (or even getting
decent routing), this will still work. I did it at my last ISP, and it
worked like a charm. 

I don't think he can possibly establish a full iBGP mesh without either
having direct connectivity or using tunnels. As long as he just meshes the
routers in the same site, and uses seperate address space at each site,
he's fine. 

This even works if you have some of the same upstreams in different sites
- I did it with both Digex and Sprint. (And I was only advertising /23s in
some cases...). I even did it with one site having Verio as an upstream. 

Daniel L. Golding        *  Senior Network Engineer
Network Engineering      *  Mindspring Enterprises  * 

On Thu, 9 Dec 1999, Tim Wolfe wrote:

> On Thu, 9 Dec 1999, Randy Bush wrote:
> > >>> First, it's my understanding that I can use a single ASN for the BGP
> > >>> peering at each of these networks.  Am I mistaken?
> > 
> > if you don't care to reach one from the other.
> > 
> > randy
> If he was to use multihop EBGP to maintain a full BGP mesh between all of the
> BGP speakers in his ASN and each POP only announced it's own networks
> upstream...?
> -- Tim
> --------------------------------------------------
> * Timothy M. Wolfe, Chief Network Engineer       *
> * ClipperNet Corporation / It's a wireless world *
> * 800.338.2629 x 402	         *
> * Sufficient for today = Inadequate for tomorrow *
> --------------------------------------------------

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