From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Thu Dec 08 2005 - 02:32:59 GMT-3
Only BGP supports this via conditional advertisement.
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
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> -----Original Message-----
> From: Andrew Lissitz (alissitz) [mailto:alissitz@cisco.com]
> Sent: Wednesday, December 07, 2005 11:02 PM
> To: Mike Flanagan; Brian McGahan; Arun Arumuganainar
> Cc: Cisco certification
> Subject: RE: Injecting default route only with loss of IP route WAS:
Re:
> IE Lab 6 conditional default route advertisement
>
> Hey Arun, Mike, Brian, and group,
>
> In a separate email, Arun suggested the default-information command
that
> referenced a route-map. I configured this and got it to work for a
> route that was in the routing table. Nice feature, thanks Arun for
> suggesting this.
>
> As Mike asks however, how to do this for a route not in the table via
an
> IGP?
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Mike Flanagan
> Sent: Wednesday, December 07, 2005 6:25 PM
> To: Brian McGahan
> Cc: Cisco certification
> Subject: Re: Injecting default route only with loss of IP route WAS:
Re:
> IE Lab 6 conditional default route advertisement
>
> I was thinking of doing this in the IGP like OSPF. Similar to how
you
> have in your Internetwork Expert lab 6 for conditional default route
> injection. Only difference is that instead of advertising when you
have
> a route only advertising when the out leaves.
>
>
> On Dec 7, 2005, at 6:11 PM, Brian McGahan wrote:
>
> > You could do this with BGP conditional advertisement.
> >
> >
> > HTH,
> >
> > Brian McGahan, CCIE #8593
> > bmcgahan@internetworkexpert.com
> >
> > Internetwork Expert, Inc.
> > http://www.InternetworkExpert.com
> > Toll Free: 877-224-8987 x 705
> > Outside US: 775-826-4344 x 705
> > 24/7 Support: http://forum.internetworkexpert.com
> > Live Chat: http://www.internetworkexpert.com/chat/
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> > Of Mike Flanagan
> > Sent: Wednesday, December 07, 2005 3:29 PM
> > To: Mike Flanagan
> > Cc: Cisco certification
> > Subject: Injecting default route only with loss of IP route WAS:
> > Re: IE
> > Lab 6 conditional default route advertisement
> >
> > Is there a way to only send a default route if you loose a route
in
>
> > the IP routing table ?
> >
> >
> >
> > On Dec 7, 2005, at 12:06 PM, Mike Flanagan wrote:
> >
> >
> >> In this section for injecting a default route you only do it if
your
>
> >> route-map matches the networks in question. Like for instance as
long
>
> >> as I have a route to 192.10.1.0/24 advertise the default route.
Well
> >> what if I wanted to advertise the default route if I lost a route
in
> >> my route table ? Like for instance lets say if I lost my connection
> >> to BB2 would I use
> >>
> >> router ospf 1
> >> default-information originate always route-map CONDITION
> >>
> >> ip prefix-list BB2 seq 5 permit 192.10.1.0/24
> >>
> >> ip prefix-list BB3 seq 5 permit 204.12.1.0/24
> >>
> >> route-map CONDITION deny 10
> >> match ip address prefix-list BB2
> >>
> >> rute-map CONDITION deny 20
> >> match ip address prefix-list BB3
> >>
> >> I think with this I would only advertise the default route if I
lose
>
> >> either route in my route table is this correct ?
> >>
> >> Also with this solution would I only advertise the default route
if
> >> I lose both connections at the same time ?
> >>
> >> router ospf 1
> >> default-information originate always route-map CONDITION
> >>
> >> ip prefix-list BB2 seq 5 permit 192.10.1.0/24 ip prefix-list BB2
seq
> >> 5 permit 204.12.1.0/24
> >>
> >> route-map CONDITION deny 10
> >> match ip address prefix-list BB2
> >>
> >>
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