From: Dan C (cdan2154@gmail.com)
Date: Sat May 17 2008 - 00:32:59 ART
Hi Robert,
It will work with any existing network in your routing table.
Cheers,
Dan
On Sat, May 17, 2008 at 9:16 AM, Robert Smith <thecure007@gmail.com> wrote:
> Hi experts,
>
> Here I come again with another question.
>
> r6-------------sw1------------------------sw2
>
> all of them are in bgp as 100
> sw1 is the route reflector
>
> r6 is advertising network 1.1.1.0/24 to sw1 via bgp
>
> I am trying to have sw1 send a default network to sw2 only if
> 1.1.1.0/24exists in its bgp table:
>
>
> ip prefix-list EXIST seq 5 permit 1.1.1.0/24
> !
> route-map EXIST permit 10
> match ip address prefix-list EXIST
> !
> router bgp 100
> neighbor 172.16.78.8 default-originate route-map EXIST
>
> 1.1.1.0 is in sw1 bgp table:
>
> sw1# sh ip bgp
> BGP table version is 4, local router ID is 172.16.78.7
> 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
> *>i1.1.1.0/24 172.16.67.6 0 100 0 i
>
> sw1#sh ip route
> Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
> D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
> N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
> E1 - OSPF external type 1, E2 - OSPF external type 2
> i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
> ia - IS-IS inter area, * - candidate default, U - per-user static
> route
> o - ODR, P - periodic downloaded static route
>
> Gateway of last resort is not set
>
> 1.0.0.0/24 is subnetted, 1 subnets
> B 1.1.1.0 [200/0] via 172.16.67.6, 00:00:02
>
> However it is not generating a default route for sw2:
>
> sw2#sh ip bgp
> BGP table version is 1, local router ID is 172.16.78.8
> 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
> * i1.1.1.0/24 172.16.67.6 0 100 0 i
>
> In the other hand, if I have r6 send 1.1.1.0 network to sw1 via ospf, then
> it originates the default route to sw2:
>
> sw1#sh ip route os
> 1.0.0.0/24 is subnetted, 1 subnets
> O 1.1.1.0 [110/65] via 172.16.67.6, 00:00:00, Serial2/0
> sw1#
>
> ========================================
>
> sw2#sh ip bgp
> BGP table version is 3, local router ID is 172.16.78.8
> 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
> *>i0.0.0.0 172.16.78.7 100 0 i
> *>i1.1.1.0/24 172.16.67.6 0 100 0 i
> sw2#
>
> So here I am confused. Is the neighbor default-originate route-map command
> meant to work only with igp advertised networks but not with bgp networks?
>
> Many thanks,
>
>
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