Re: Advertising local host routes in BGP?

Publish the routes via an IGP instead of static routes

On Fri, Apr 16, 2010 at 11:29 AM, Bryan Bartik <bbartik_at_ipexpert.com> wrote:

> Jeffrey,
>
> How did you diagnose it as a routing loop? Does it happen while R1 is down
> or after R1 comes back up?
>
> On Thu, Apr 15, 2010 at 9:37 PM, Jeffrey Pazahanick <jeffpaz_at_gmail.com
> >wrote:
>
> > I have a situation where I'm trying to advertise only 4 host routes
> > from a /24 network to my BGP neighbors.
> > As an example,
> >
> > #R1
> > interface g0/0
> > ip addr 1.1.1.2 255.255.255.0
> > standby ip 1.1.1.1
> >
> > router bgp 1
> > network 1.1.1.4 mask 255.255.255.255
> > network 1.1.1.5 mask 255.255.255.255
> > network 1.1.1.7 mask 255.255.255.255
> > network 1.1.1.9 mask 255.255.255.255
> >
> > With a single router, a static route to the interface worked fine..
> >
> > ip route 1.1.1.4 255.255.255.255 g0/0
> > ip route 1.1.1.5 255.255.255.255 g0/0
> > ip route 1.1.1.7 255.255.255.255 g0/0
> > ip route 1.1.1.9 255.255.255.255 g0/0
> >
> > When adding a redundant router, things initially work as well..
> >
> > #R2
> > interface g0/0
> > ip addr 1.1.1.3 255.255.255.0
> > standby ip 1.1.1.1
> >
> > router bgp 1
> > network 1.1.1.4 mask 255.255.255.255
> > network 1.1.1.5 mask 255.255.255.255
> > network 1.1.1.7 mask 255.255.255.255
> > network 1.1.1.9 mask 255.255.255.255
> >
> > ip route 1.1.1.4 255.255.255.255 g0/0
> > ip route 1.1.1.5 255.255.255.255 g0/0
> > ip route 1.1.1.7 255.255.255.255 g0/0
> > ip route 1.1.1.9 255.255.255.255 g0/0
> >
> > The issue arises when R1 fails, R2 has a CEF routing loop..
> >
> > Troubleshooting Cisco Express Forwarding Routing Loops
> > Document ID: 26083
> >
> >
> http://www.cisco.com/en/US/partner/tech/tk827/tk831/technologies_tech_note09186a00800cdf2e.shtml
> >
> > The link says the solution is to point the statics to the next hop;
> > which I can't, as they are local.
> >
> > Is there another way to advertise these host routes?
> >
> > I've been trying to use inject-maps, but my own routers are the route
> > source, and it doesn't appear to work.
> >
> > Ideas?
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
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> >
> >
> >
> >
> >
> >
> >
> >
>
>
> --
> Bryan Bartik
> CCIE #23707 (R&S, SP), CCNP
> Sr. Support Engineer - IPexpert, Inc.
> URL: http://www.IPexpert.com <http://www.ipexpert.com/>
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
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Received on Fri Apr 16 2010 - 17:35:15 ART