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

  • From: Daniel Golding
  • Date: Thu Dec 09 16:24:16 1999

It works just fine with isolated networks. Just advertise the portions of
the address space you are using out each EBGP connections. Overlapping
this space with isolated networks falls under the category of bad mojo.

Email me off-line if you need specifics on how to set this up. Only one AS
number required.

--------------------------------------------------------------
Daniel L. Golding        *  Senior Network Engineer
Network Engineering      *  Mindspring Enterprises
[email protected]  * 
--------------------------------------------------------------

On Thu, 9 Dec 1999, Tim Wolfe wrote:

> 
> I'm forwarding this off inet-access because there is a lot more BGP clue
> here.  Anyone have any comments on the particular situation below, and/or
> regarding announcing different routes at multiple locations to multiple
> providers with single/many different ASNs?
> 
> Thanks,
> 
> -- Tim
> 
> --------------------------------------------------
> * Timothy M. Wolfe, Chief Network Engineer       *
> * ClipperNet Corporation / It's a wireless world *
> * [email protected] 800.338.2629 x 402	         *
> * Sufficient for today = Inadequate for tomorrow *
> --------------------------------------------------
> 
> ---------- Forwarded message ----------
> Date: Thu, 9 Dec 1999 12:58:46 -0800 (PST)
> From: Tim Wolfe <[email protected]>
> Reply-To: [email protected]
> To: [email protected]
> Subject: Re: Portable IP space, isolated networks, BGP, etc...
> 
> On Thu, 9 Dec 1999, James Fischer wrote:
> 
> > From: "Troy Settle" <[email protected]>
> > Subject: Portable IP space, isolated networks, BGP, etc...
> > 
> > > I've been thrown into a situation where I've got 8 isolated networks
> > > connected to a variety of providers.  Eventually, most of these will be
> > > connected with our own backbone.  I need to find a way to make the
> > > transition as seemless as possible.
> > >
> > > First, it's my understanding that I can use a single ASN for the BGP
> > peering
> > > at each of these networks.  Am I mistaken?
> > 
> > Yes, this is a Big Mistake(tm).  One would need a unique ASN for each site,
> > but they are only numbers, and the cost is like $500 each.  Think about
> > the implications of two different sites, fed by the same provider, both
> > using the same ASN.   Not a pretty picture.  BGP hell.
> 
> Could you please clarify what exactly the problem with doing this is?  Many
> huge providers have multiple peering points that exchange routes using the
> same ASN for their peering routers don't they?
> 
> -- Tim
> 
> --------------------------------------------------
> * Timothy M. Wolfe, Chief Network Engineer       *
> * ClipperNet Corporation / It's a wireless world *
> * [email protected] 800.338.2629 x 402	         *
> * Sufficient for today = Inadequate for tomorrow *
> --------------------------------------------------
> 
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