Re: BGP conditional advertise not working.

From: Sadiq Yakasai (sadiqtanko@gmail.com)
Date: Tue Feb 17 2009 - 22:13:45 ARST

Thats right Ravi! Thanks for that !! ;-)

On Tue, Feb 17, 2009 at 11:42 PM, Ravi Singh <way2ccie@googlemail.com>wrote:

> Sadiq,
>
> I think what you are talking about here is the use of an inject-map with an
> exist/non-exist-map. However, for Mahesh's question he is using an
> advertise-map.
>
> Mahesh,
> The network 136.1.23.0/24 needs to be in the BGP table and not in the
> routing table. I think it does not exist in the BGP table which makes the
> condition of the "non-exist-map" to true and the route 136.1.29.0/24 is
> being advertised.
>
> HTH
> Ravi
>
>
> On Tue, Feb 17, 2009 at 10:41 PM, Sadiq Yakasai <sadiqtanko@gmail.com>wrote:
>
>> I havent done this in a long time, but i remember 2 things which I havent
>> see above:
>>
>> 1. There was matching on the "next-hop" of a prefix. I dont remember if
>> this
>> goes in the first or second route-map. Check that one.
>>
>> 2. The route-map containing the prefix to be injected should have "set ip
>> address" and not "match ip add". Can you check this feature documentation
>> again to confirm these things please?
>>
>> HTH,
>>
>> Sadiq
>>
>> On Tue, Feb 17, 2009 at 10:23 PM, Mahesh Shivaswamy <
>> maheshs.cisco@gmail.com
>> > wrote:
>>
>> > Hi,
>> >
>> > I am not sure why is R2 advertising prefix 136.1.29.0/24 when the
>> > route 136.1.23.0/24 exist in the routing table ???
>> >
>> > I have the following configs on R2
>> >
>> > R2#sh run | be router bgp
>> > router bgp 300
>> > no synchronization
>> > bgp router-id 150.1.2.2
>> > bgp log-neighbor-changes
>> > network 136.1.29.0 mask 255.255.255.0
>> > neighbor 136.1.23.3 remote-as 100
>> > neighbor 136.1.29.9 remote-as 100
>> > neighbor 136.1.245.5 remote-as 200
>> > neighbor 136.1.245.5 advertise-map ADVERTISE non-exist-map NON-EXIST
>> > no auto-summary
>> > !
>> > ip prefix-list HDLC seq 5 permit 136.1.23.0/24
>> > !
>> > ip prefix-list VLAN29 seq 5 permit 136.1.29.0/24
>> > !
>> > route-map NON-EXIST permit 10
>> > match ip address prefix-list HDLC
>> > !
>> > route-map ADVERTISE permit 10
>> > match ip address prefix-list VLAN29
>> >
>> > R2#sh ip bgp ne 136.1.245.5 advertised-routes
>> > BGP table version is 9, local router ID is 150.1.2.2
>> > Status codes: s suppressed, d damped, h history, * valid, > best, i -
>> > internal,
>> > r RIB-failure, S Stale
>> > Origin codes: i - IGP, e - EGP, ? - incomplete
>> >
>> > Network Next Hop Metric LocPrf Weight Path
>> > *> 136.1.3.0/24 136.1.23.3 0 0 100 i
>> > *> 136.1.29.0/24 0.0.0.0 0 32768 i
>> >
>> > Total number of prefixes 2
>> >
>> >
>> > R2#sh ip bgp ne 136.1.245.5 | in Condition
>> > Condition-map NON-EXIST, Advertise-map ADVERTISE, status: Advertise
>> >
>> >
>> > R2#sh ip route 136.1.23.0
>> > Routing entry for 136.1.23.0/24
>> > Known via "connected", distance 0, metric 0 (connected, via interface)
>> > Redistributing via ospf 1, eigrp 100
>> > Advertised by ospf 1
>> > Routing Descriptor Blocks:
>> > * directly connected, via Serial0/1
>> > Route metric is 0, traffic share count is 1
>> >
>> > rgds
>> > Mahesh
>> >
>> >
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>> >
>> >
>> >
>> >
>>
>>
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