From: Andrew Lissitz \(alissitz\) (alissitz@cisco.com)
Date: Thu Dec 08 2005 - 02:02:05 GMT-3
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
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>
> -----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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