From: Gupta, Gopal (NWCC) (gopal.gupta@hp.com)
Date: Sat May 17 2008 - 12:04:34 ART
Hi Robert,
This should work actually, and if you don't run IGP, how will you have reachability to the nextHops?
So, It is must to run IGP or otherwise some Static Routing.
HTH
Gops
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Robert Smith
Sent: Saturday, May 17, 2008 4:46 AM
To: Cisco certification
Subject: bgp command neighbor default-originate route-map
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,
This archive was generated by hypermail 2.1.4 : Mon Jun 02 2008 - 06:59:17 ART