Re: Conditional ISIS default route advertisement

That worked! Thanks, I appreciate the help. I was getting tired of trial
and error to find the right configuration! lol I tried several different
ways and just wasn't getting it right. It seems odd that it has to be done
a certain way like that. For example, one of my attempts had "match ip
next-hop 3.3.3.3". Why did that fail, but "match ip next-hop 1" where
access-list 1 permits 3.3.3.3 succeeds?

Thanks again!
John

On Tue, Jul 31, 2012 at 10:21 PM, Yuri Bank <yuribank_at_gmail.com> wrote:

> Try using a prefix-list to match the route, and a standard ACL to
> match the next-hop.
>
> ip prefix-list default permit 0.0.0.0/0
> access-list 1 permit 3.3.3.3
>
> route-map conditional permit 10
> match ip address prefix-list default
> match ip next-hop 1
>
> -Yuri
>
> On Tue, Jul 31, 2012 at 7:09 PM, John Neiberger <jneiberger_at_gmail.com>
> wrote:
> > I'm toying around with conditional default advertisement in ISIS and I
> just
> > can't get it tuned right. A router, let's call it R2, has an eBGP peer
> and
> > another "internal" peer and it's learning a default from both. I'm trying
> > to configure R2 such that it only advertises a default if it is learning
> it
> > from its eBGP peer. The problem I'm having is that no matter how I've
> > configured it, whenever I add a route map to the default-information
> > originate command, it just stops advertising the default. I haven't found
> > any example configurations, so I really don't know how to craft the route
> > map. I've tried matching the next hop of the route and I've tried using
> an
> > ACL, but neither is working.
> >
> > The eBGP peer is 3.3.3.3. This is the first route map I tried:
> >
> > route-map ISIS_DEFAULT permit 10
> > match ip next-hop 3.3.3.3
> >
> > That didn't work at all. I was hoping it would match on the route in the
> > routing table, but it didn't seem to work at all. So, I tried this:
> >
> > access-list 100 permit 0.0.0.0 0.0.0.0 3.3.3.3 0.0.0.0
> >
> > route-map ISIS_DEFAULT
> > match ip address 100
> >
> > I thought that would look for a 0.0.0.0 route in the table with a
> next-hop
> > of 3.3.3.3, but that didn't work either. It's been a LONG time since I've
> > done anything like this. Please refresh my memory. :)
> >
> > I'm sure I'm missing something obvious, but what is it?
> >
> > Thanks,
> > John
> >
> >
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Received on Tue Jul 31 2012 - 23:53:08 ART