[c-nsp] BGP default route with multi ISPs

[Rodney Dunn]

OER sounds like a much better solution here.

You could redistribute the routes injected on the
border routers with a closer IGP admin distance
based on route-map matching and that would pull
the traffic to the appropriate exit router.

Just because you have equal cost defaults in
the core doesn't mean your traffic will flow
to the best exit point. It just means that more
paths to the exit point of the network are available. 
Having them it may end up providing some load distribution
over the exit points but how much is nondeterministic.


Rodney

On Tue, Nov 16, 2004 at 06:12:11PM -0300, Noriega, Alejandro wrote:
> I have a doubt about an implementation of this feature.
> I have 3 upstream providers. I receive a default route form each one. The upstream bandwidth is the same.
> I want to do load-sharing between these upstreams. Could I generate a conditional default route (only generate it if match the upstream one) and inject this to my backbone router. Doing this on my 3 border router I'd be receiving in my backbone router 3 default routes vía iBGP with my AS and I'd use the command "maximum-paths ibgp 3". Could this implementation work? Anyone did it?
> 
> Thanks in advance.
> Regards,
> Alejandro.
> 
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Earls, Michael
> Sent: Tuesday, November 16, 2004 5:48 PM
> To: cisco-nsp at puck.nether.net
> Subject: RE: [c-nsp] BGP default route with multi ISPs
> 
> 
> Perfect,
> 
> That works for me.
> 
> michael
> 
> Michael 
> 
> PGP Info: KeyID 0x0DFD993C
> Fingerprint F903 0325 5105 2CDB 4BF4 C88B 72F7 BA7A 28CC 598A 
> 
> 
> -----Original Message-----
> From: Oliver Boehmer (oboehmer) [mailto:oboehmer at cisco.com]
> Sent: Tuesday, November 16, 2004 3:37 PM
> To: Earls, Michael; cisco-nsp at puck.nether.net
> Subject: RE: [c-nsp] BGP default route with multi ISPs
> 
> 
> 
> > Can BGP have two default routes to 2 different ISPs being used for 
> > load sharing.
> 
> Not to two different ISPs, but in your case it is the same remote-as, so you can use standard BGP multipath load-sharing (enable "maximum-paths 2" in your BGP router). See http://www.cisco.com/warp/public/459/25.shtml#bgpmpath
> 
> > 101>sh ip bgp
> > BGP table version is 6, local router ID is 1.1.1.1
> > Status codes: s suppressed, d damped, h history, * valid, > best, i - 
> > internal,
> >               S Stale
> > Origin codes: i - IGP, e - EGP, ? - incomplete
> > 
> >    Network          Next Hop            Metric LocPrf Weight Path
> > *  0.0.0.0          65.157.156.2                            0 36360 i
> > *>                  65.157.156.3                            0 36360 i
> > 
> 
> 	oli
> 
> 
> 
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