From: Bit Gossip (bit.gossip@chello.nl)
Date: Thu Sep 06 2007 - 16:36:05 ART
Yemi,
I tested your proposal but I am not able to get it to work: in general it
doesn't seem to like a negative condition in the route-map.
I have the following proposal that seems to work instead: create a loopback
interface as a back-up interface of e0/0. The condition of the default is on
this new loopback so that when e0/0 goes down -> lo0 goes up and the default
is announced.
interface Loopback0
ip address 2.2.2.2 255.255.255.255
!
interface FastEthernet0/0
backup interface Loopback0
ip address 157.1.36.3 255.255.255.0
duplex full
!
router rip
version 2
network 12.0.0.0
network 23.0.0.0
default-information originate route-map CONDITION
!
access-list 1 permit 2.2.2.2
!
route-map CONDITION permit 10
match ip address 1
!
----- Original Message -----
From: "Salau, Yemi" <yemi.salau@siemens.com>
To: "Sergey" <public@svlp.net>; "Cisco certification"
<ccielab@groupstudy.com>
Sent: Tuesday, September 04, 2007 11:09 AM
Subject: RE: RIP Conditional advertisiment
> To be honest, if there is any other thing in the RIB table, then your
> first option should work.
>
> I believe when you do route-map with default-information originate with
> RIP, you're actually looking for something in the RIB, init?
>
> So If I do
> route-map RG deny 5
> match ip address prefix-list E00
>
> That will not return any variable to the defualt-information originate
> line, but when you add:
> !
> route-map RG permit 10
>
> That should return all other routes in your RIB to your
> default-information originate line, hence RIP should then advertise the
> default-route.
>
> For the second Option:-
>
> route-map RG permit 10
> match ip address prefix-list E00
> !
> This line return a variable to the default-information originate line,
> and remember there is always implicit deny entry within route-maps, just
> like access-lists.
>
> So, the "invicible" deny entry wouldn't return any variable to the
> default-information line, as long as a variable gets returned to the
> default-information originate line, then RIP should advertise the
> default route.
>
> Many Thanks
>
> Yemi Salau
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Sergey
> Sent: Tuesday, September 04, 2007 9:12 AM
> To: 'Cisco certification'
> Subject: RIP Conditional advertisiment
>
> I want that router advertise default gateway via RIP only if interface
> E0/0 is down.
> my configuration is
>
>
> interface Ethernet0/0
> ip address 157.1.36.3 255.255.255.0
> shutdown
> half-duplex
>
> router rip
> default-information originate route-map RG
>
> ip prefix-list E00 seq 5 permit 157.1.36.0/24
>
> route-map RG deny 5
> match ip address prefix-list E00
> !
> route-map RG permit 10
>
> In my logic, if E0/0 is up than route 157.1.36.0/24 present in routing
> table, and default gateway advertising is suppressed by "route-map RG
> deny 5" but it seems "route-map RG deny
> 5" suppress route in spite of status of E0/0, with my config router
> never advertise default.
>
>
> but if i want opposite task (advertise default only if E0/0 is up) than
> conditional advertising works fine
>
> router rip
> default-information originate route-map RG
>
> ip prefix-list E00 seq 5 permit 157.1.36.0/24
>
> route-map RG permit 10
> match ip address prefix-list E00
> !
>
> if E0/0 is up router advertise default, if it down router not advertise
> default.
>
> Why if I use deny statement in route-map, conditional advertising
> failed?
>
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