bgp as prepend

[burhanburhan]

Hi,

I have two subnets and configure as-path prepend one of them. I can see the subnet that i configure prepend but can't see another subnet that i didn't configure prepend.am i doing wrong something?

R1

router bgp XXXX
no synchronization
bgp log-neighbor-changes
neighbor 192.168.1.2 remote-as YYYY
neighbor 192.168.1.2 soft-reconfiguration inbound
no auto-summary

R2

router bgp YYYY
no synchronization
bgp log-neighbor-changes
network AAA.BBB.CCC.0 mask 255.255.255.0
network PPP.PPP.PPP.0 mask 255.255.255.0
neighbor 192.168.1.1 remote-as XXXX
neighbor 192.168.1.1 soft-reconfiguration inbound
neighbor 192.168.1.1 route-map PREPEND out
no auto-summary
!
ip forward-protocol nd
!
!
no ip http server
no ip http secure-server
!
ip access-list standard PREPEND
permit AAA.BBB.CCC.0 0.0.0.255
!
no cdp log mismatch duplex
route-map PREPEND permit 10
match ip address PREPEND
set as-path prepend YYYY YYYY YYYY
!

R1#sh ip bgp
BGP table version is 6, local router ID is 192.168.1.1
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
*> AAA.BBB.CCC.0/24     192.168.1.2 0      0         YYYY YYYY YYYY YYYY i

[Francesco Molino · Accepted solution]

Hi

You should add another route-map statement like:

route-map PREPEND permit 20

If you don't want to modify anything for other subnets, just add the command above without anything else. You need it to say all other subnets except PREPEND acl should be there without specific treatment.

Thanks

PS: Please don't forget to rate and mark as correct answer if this answered your question

[burhanburhan]

hi supportlan, it's working now, thansk a lot.

[Francesco Molino]

Hi burhanburhan

No problem, you're very welcome