Re: Conditional Advertising - OSPF default-inf orig route-map

you cud do ...

1) create 2 SLA's ..(OBJECT2 echo to 1.1.1.1 and OBJECT 3 echo to 2.2.2.2)
2) create track boolean list
track 1 list boolean and
 object 2
 object 3
3) ip route <some bogus address> track 1
4) access-list matching <bogus address>
5) route-map matching access-list matching bogus address
6) tie it to default information orginate.

On Fri, Dec 11, 2009 at 3:11 AM, Divin Mathew John <divinjohn_at_gmail.com>wrote:

> R1(config)#route-map HELLO
> R1(config-route-map)#a
> R1(config-route-map)#ma
> R1(config-route-map)#match ip add
> R1(config-route-map)#match ip address ?
> <1-199> IP access-list number
> <1300-2699> IP access-list number (expanded range)
> WORD IP access-list name
> prefix-list Match entries of prefix-lists
> <cr>
> *
> *
> *R1(config-route-map)#match ip address 1*
> *R1(config-route-map)#match ip address 2*
> R1(config-route-map)#exit
> R1(config)#exit
> R1#sh r
> *Dec 11 03:09:41.895: %SYS-5-CONFIG_I: Configured from console by consoleo
> R1#sh ro
> R1#sh rou
> *R1#sh route-map*
> *route-map HELLO, permit, sequence 10*
> * Match clauses:*
> * ip address (access-lists): 1 2*
> * Set clauses:*
> Policy routing matches: 0 packets, 0 bytes
> R1#sh run | be route-map
> *route-map HELLO permit 10*
> * match ip address 1 2*
> !
> !
> !
> !
> control-plane
> !
> !
> !
> !
> !
> !
> gatekeeper
> shutdown
> !
> !
> line con 0
> stopbits 1
> line aux 0
> line vty 0 4
> !
> !
> end
>
> R1#
>
>
> On Fri, Dec 11, 2009 at 2:59 AM, Donald Virgil <d.virgil88_at_gmail.com>wrote:
>
>> Hi, i've been trying to get my head around conditional advertising using
>> route maps. So here is the scenario in regards to OSPF.
>>
>> 1. Advertise a default route given the presence of 1.1.1.0/24 and
>> 2.2.2.0/24 in the routing table.
>>
>> This is easy enough, using a single ACL with both routes listed. This way
>> as long as EITHER one of the routes is in the routing table, the default
>> route is advertised. When both routes go away, the default advertisement
>> stops.
>>
>> The confusion comes in when I try to get the default advertisement to stop
>> when EITHER of the 2 routes disappears. This doesn t seem to work
>> regardless of what combo of route-map and ACL I use.
>> My understanding of route-map AND/OR algorithm is that if you have a
>> single
>> match statement with multiple elements, (e.g. match ip add 1 2) this is a
>> logical OR. A route-map with multiple match statements (e.g. route-map x
>> per 10 match ip add 1; route-map x per 20 match ip add 2) is a logical
>> AND. A route-map with a single match clause and element with multiple
>> lines (match ip add 3) is a logical OR.
>>
>> Assuming ACL s are:
>> access-l 1 per 1.1.1.0 0.0.0.255
>> access-l 2 per 2.2.2.0 0.0.0.255
>> access-l 3 per 1.1.1.0 0.0.0.255
>> access-l 3 per 2.2.2.0 0.0.0.255
>>
>>
>> Regardless of how I construct my route-map and ACL combo, the default
>> route
>> is advertised by OSPF as long as EITHER the 1.1.1.0/24 or 2.2.2.0/24 is
>> present in the routing table. Could you guys please help me understand
>> this
>> a little better?
>>
>> Thanks in advance,
>> Don
>>
>>
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>
>
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