From: ccie2be (ccie2be@nyc.rr.com)
Date: Wed Dec 29 2004 - 18:35:26 GMT-3
Hi Roberto,
Based on what you said, I tried this:
route-map CONDITIONAL-DEFAULT permit 10
match interface Serial0/0.501 Serial0/0.502
I figured that since both sub-interfaces were up/up and had ip addresses
assigned to them, this would work.
It didn't.
Apparently, this conditional default only works if an acl or prefix list is
referenced in the match statement
of the route-map.
Any ideas why that is?
TIA, Tim
----- Original Message -----
From: "Roberto Adjakou" <radjakou@cfao.sn>
To: "ccie2be" <ccie2be@nyc.rr.com>; "Group Study" <ccielab@groupstudy.com>
Sent: Tuesday, December 28, 2004 7:32 AM
Subject: RE: Conditional injection of default route with rip: IE lab 13,
task 5.12
> Since there is no ip address configured on s0/0, no routing protocol
relies on it.
> In fact, ISIS is enabled on s0/0.501 and s0/0502 not on s0/0!!
>
> sh ip route | i Serial0/0 should edify on this point.
>
> -----Message d'origine-----
> De : ccie2be [mailto:ccie2be@nyc.rr.com]
> Envoyi : lundi 27 dicembre 2004 19:30
> @ : Group Study
> Objet : Conditional injection of default route with rip: IE lab 13, task
5.12
>
> Hi guys,
>
> Depending on what is being matched in the route-map, I discovered that
> sometimes the
>
> conditional default injection works and sometimes it doesn't even though
it
> seems to me that it
>
> should work either way.
>
> The objective is to advertise a default route to R1 if either of R2's s0's
> sub-interfaces is up.
>
> Here's the scenario:
>
> R1 --- rip --- r2 s0
>
>
> s0 is using frame encap and has 2 sub-interfaces s0.501 and s0.502
>
> And, R2's rip config is like this:
>
> router rip
> ver 2
> default-info originate route-map CONDITIONAL
>
> r1 sees the default route if the route-map on R2 matches against the ip
> address
>
> configured on s0.501 and s0.502 when a prefix list is used
>
> route-map CONDITIONAL
> mat ip address prefix FRAME <- the prefix list specifies the ip
addresses
> configured on s0.501 and s0.502
>
> If the route-map matches on interface s0/0, it doesn't work.
>
> route-map CONDITIONAL
> match int s0 <- Configured this way, R1 doesn't see
the
> default route.
>
>
>
> The way I see it, if either of the s0 sub-interfaces is up, then s0 itself
> will be up and therefore, R2
>
> should advertise the default route.
>
> Can anyone explain why I need to match against an ip prefix list for this
to
> work and why matching against
>
> the interface doesn't work?
>
> TIA, Tim
>
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