[nsp] network statements in two eBGP peers

[isaac at ravengate.net]

Hey Joshua,

thanks a lot for the reply.

when u say this:

> if you have seperate addresses for each asn, then originate the 
> prefixes from the right asn, and just let the other router prepend
> its' as on the way out

we do this now, this is how we currently announce to both upstreams
(above.net and savvis)

ASN 1 (we're not Genu!ty- just using for an example)  :)

ASN 1 injects all of its own space and announces this space to
Above.net and ASN 2

ASN 2 injects all of its own space and announces this space to Savvis
and ASN 1.

so stuff out on the net looks like:

1 6461 etc etc

and

1 2 6347

-------

2 6347 etc etc

and

2 1 6461 etc etc

-------

so, you see we are prepending on of our AS's on the way out.

the problem is tho, we only have 1 router in each respective Autonmous
System injecting address space.  if we lose that router, we lose
announcing that ASN's space.

is it totally going to cause probs to have routes originating from two
different AS's?  routing loops would be a real drag.

what about having an iBGP router in AS 1 inject the same space as the
border router in AS 1?  this other router also peers with AS 2....

thanks!





Quoting joshua sahala <jejs at sahala.org>:
> On (18/02/04 21:03), Brian Wallingford wrote:
> > 
> > On Wed, 18 Feb 2004 isaac at ravengate.net wrote:
> > :is it a problem to announce the same networks from two different eBGP
> > :peers to two different upstreams?
> > 
> > 
> > There are no technical barriers to this scenario, only political (and only
> > if the prefixes are not your own).
> > 
> 
> if you do not consider inconsistant-as a technical problem - your
> prefixes will appear to be originated by different asn's...typically not
> a good thing
> 
> if you have seperate addresses for each asn, then originate the prefixes
> from the right asn, and just let the other router prepend its' as on the
> way out
> 
> /joshua


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