Re: Conditional ISIS default route advertisement

John,

there is a similar example of these in the BGP-4 Command and Configuration
HandBook on pages 133-134 but Yuri beat me to the punch on this one.

JS

On Wed, Aug 1, 2012 at 12:53 AM, John Neiberger <jneiberger_at_gmail.com>wrote:

> 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
> > >
> > >
> > > Blogs and organic groups at http://www.ccie.net
> > >
> > > _______________________________________________________________________
> > > Subscription information may be found at:
> > > http://www.groupstudy.com/list/CCIELab.html
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net
Received on Wed Aug 01 2012 - 01:08:38 ART