Real life BGP Subnet Question

From: Eric Vanuska (eric.vanuska@xxxxxxxxxxxxx)
Date: Mon May 28 2001 - 13:30:04 GMT-3


   
Hello all,

I would like to be able to advertise a single subnet of a class B
network when I only learn of the class B summary address.

For example, I want to advertise 172.16.1.0/24, but I only have
the class B summary 172.16.0.0/16.

I don't want to use "no sync" because we have multiple paths
and want to be able to use them.

I've tried an aggregate-address - no success..

Ideas? Configs are below.
Thanks, Eric V.

router bgp 1000
 bgp router-id 192.168.63.254
 aggregate-address 172.16.1.0 255.255.255.0 (also tried without this
statement)
 redistribute ospf 100 route-map To-Partner
 neighbor 192.168.63.1 remote-as 2000
 neighbor 192.168.63.1 soft-reconfiguration inbound
 neighbor 192.168.63.1 route-map From-Partner in
 no auto-summary
!
ip classless
no ip http server
!
access-list 50 permit 172.31.0.0 0.0.255.255
!
access-list 75 permit 192.168.129.0 0.0.0.255
access-list 75 permit 172.16.1.0 0.0.0.255
!
route-map From-Partner permit 10
 match ip address 50
!
route-map To-Partner permit 10
 match ip address 75

Router#sh ip bgp neigh 192.168.63.1 adv
BGP table version is 308, local router ID is 192.168.63.254
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal
Origin codes: i - IGP, e - EGP, ? - incomplete

   Network Next Hop Metric LocPrf Weight Path

*> 192.168.129.0 0.0.0.0 0 32768 ?
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