From: Carlos G Mendioroz (tron@huapi.ba.ar)
Date: Sat Jul 05 2003 - 17:29:31 GMT-3
Confeds ?
Scott Morris wrote:
> No, because iBGP doesn't ever add to the as-path. (Same AS, no need to
> add)
>
>
>
> Scott
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Jason Cash
> Sent: Monday, June 30, 2003 11:40 PM
> To: ccielab@groupstudy.com
> Subject: AS Path prepend in IBGP
>
>
> Is it possible to advertise an as-path prepend via IBGP? For some
> reason, it doesn't seem to take:
>
>
>
> R5(s0)---(s0)R2
>
> (e0)
>
> |
>
> (e0)
>
> R8
>
>
>
>
>
> R5
>
> interface Loopback0
>
> ip address 200.0.0.5 255.255.255.255
>
> !
>
> interface Loopback1
>
> ip address 172.32.1.1 255.255.255.0
>
> !
>
> router bgp 200
>
> no synchronization
>
> bgp log-neighbor-changes
>
> network 172.32.1.0 mask 255.255.255.0
>
> neighbor 200.0.0.2 remote-as 200
>
> neighbor 200.0.0.2 update-source Loopback0
>
> neighbor 200.0.0.2 route-map addas out
>
> neighbor 200.0.0.8 remote-as 8
>
> neighbor 200.0.0.8 ebgp-multihop 5
>
> neighbor 200.0.0.8 update-source Loopback0
>
> neighbor 200.0.0.8 timers 30 90
>
> neighbor 200.0.0.8 route-map addas out
>
> no auto-summary
>
> !
>
> access-list 5 permit 172.32.1.0 0.0.0.255
>
> !
>
> route-map addas permit 10
>
> match ip address 5
>
> set as-path prepend 500 501
>
> !
>
> route-map addas permit 20
>
>
>
>
>
> Below is the 'sh ip bgp' from both routers. R2 is iBGP and R8 is eBGP.
> R8 shows the as-path prepend
>
> whereas R2 does not. What is the problem?
>
>
>
> r2#sb
>
> BGP table version is 37, local router ID is 200.0.0.2
>
> 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
>
> *>i100.100.100.0/24 200.0.0.4 0 100 0 i
>
> *>i101.101.101.0/24 200.0.0.4 0 100 0 i
>
> *> 172.16.0.0/22 200.0.0.1 0 8888 i
>
> *>i172.32.1.0/24 200.0.0.5 0 100 0 i
>
> *>i200.200.200.0 200.0.0.6 0 100 0 i
>
>
>
>
>
> r8#sb
>
> BGP table version is 19, local router ID is 200.0.0.8
>
> 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
>
> *> 100.100.100.0/24 200.0.0.5 0 200 i
>
> *> 172.16.0.0/22 200.0.0.5 0 200 8888 i
>
> *> 172.32.1.0/24 200.0.0.5 0 0 200 500 501
> i
>
> *> 200.200.200.0 200.0.0.5 0 200 i
>
>
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-- Carlos G Mendioroz <tron@huapi.ba.ar> LW7 EQI Argentina
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