From: Tarun Pahuja (pahujat@gmail.com)
Date: Fri Nov 23 2007 - 19:33:27 ART
Gupta,
While we are on this topic(bgp and next-hop) we might as well
understand it to it's depth. EBGP changes the next hop whereas IBGP does not
unless you explicitly specify.There are cases where ebgp does not modify the
next hop, just like IBGP!!! Yes, and the case is when EBGP peers are part of
a confederations. I am sure you will run into this issue as well at some
point. I thought I would mention it even though it was not what you were
looking for.
http://www.cisco.com/warp/public/459/bgpfaq_5816.shtml#twelve
Thanks,
Tarun
On 11/23/07, Gupta, Gopal (NWCC) <gopal.gupta@hp.com> wrote:
>
> Hi Folks,
>
> I am facing issue with BGP..
>
> R1 , R2, R3 are spokes connected to hub R5 throgh Frame relay .... all
> with the major interface.
> having subnet 155.1.0.0/24 and all are in their own individual AS ; R1
> is in AS1, R2 in 2, R3 in 3, R5 in 5.
>
> when routes originated by R2 are sent to R5 and then R5 in turn sends
> that route to R3 or R1, the next hop doesn't change which should be
> changed coz of EBGP connections and should not be changed coz of
> Frame-relay NBMA on same subnet.
>
> and if i try to set next-hop-self under neighbor stement on R5 for
> R1,R2&R3..i get an error message
>
> R5(config-router)#neighbor 155.1.0.1 next-hop-self
> %BGP: next-hop-self is implied for an eBGP peer, there is no need to
> configure it
> R5(config-router)#neighbor 155.1.0.2 next-hop-self
> %BGP: next-hop-self is implied for an eBGP peer, there is no need to
> configure it
> R5(config-router)#neighbor 155.1.0.3 next-hop-self
> %BGP: next-hop-self is implied for an eBGP peer, there is no need to
> configure it
>
> I know i can set it manually throgh Route-map, is this the only way we
> can have workaround or i am missing something.....not sure.
>
> Any Comments please !!!!!!
>
> Best Regards,
> Gops
>
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