Re: EBGP Not changing Next Hop

third party next-hop
http://blog.ine.com/2010/09/02/understanding-third-party-next-hop/
-well explained.

On Sat, Dec 11, 2010 at 5:22 PM, SD <networker.ccie_at_gmail.com> wrote:
> Hi,
>
> I have a below scenario can some 1 explain me why ebgp is not changing next
> hop in the below sceario
>
>
> R1, R2, R3 in the same Broadcast Segment
>
> R1 : 10.10.10.1 B AS : 100
> R2 : 10.10.10.2 B AS : 200
> R3 : 10.10.10.3 B AS : 300
>
>
>
>
> R1--------ebgp-------R2--------ebgp------R3
>
>
> Routing update sent by R1 to R2 is sent to R3 via eBGP but R2 does not
> change the next hop from 10.10.10.1 to 10.10.10.2
>
>
>
>
>
>
>
> R3 Debug output, although output shows route travelling through 2 AS but the
> next hop is direct. Can some one pleaswe explain me why already tried
> googling but no success...
>
> R3# OPEN has CAPABILITY code: 2, length 0
> 00:09:57: BGP: 10.10.10.2 OPEN has ROUTE-REFRESH capability(new) for all
> address-families
> BGP: 10.10.10.2 rcvd OPEN w/ remote AS 200
> 00:09:57: BGP: 10.10.10.2 went from OpenSent to OpenConfirm
> 00:09:57: BGP: 10.10.10.2 went from OpenConfirm to Established
> 00:09:57: %BGP-5-ADJCHANGE: neighbor 10.10.10.2 Up
> 00:09:58: IP: s=10.10.10.2 (FastEthernet0/0), d=10.10.10.3, len 126, rcvd 0
> 00:09:58: BGP(0): 10.10.10.2 rcvd UPDATE w/ attr: nexthop 10.10.10.1, origin
> i, *path 200 100*
> 00:09:58: BGP(0): 10.10.10.2 rcvd 1.1.1.1/32
> 00:09:58: BGP(0): Revise route installing 1 of 1 route for *1.1.1.1/32 ->
> 10.10.10.1* to main IP table
> 00:09:58: IP: s=10.10.10.2 (FastEthernet0/0), d=10.10.10.3, len 40, rcvd 0
> R3#
>
>
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Received on Sun Dec 12 2010 - 18:31:49 ART