From: Narbik Kocharians (narbikk@gmail.com)
Date: Fri Nov 23 2007 - 13:30:18 ART
You can resolve it via a route-map configured on the spokes, they can match
on the AS number of the other spoke and set the ip next-hop to the hub, but
this needs to be done on both spokes.
On 11/23/07, Gupta, Gopal (NWCC) <gopal.gupta@hp.com> wrote:
>
> Thanks for your inputs,
>
> Till here its fine, but i would like to know why we cant we use neighbor
> x.x.x.x next-hop-self command in this case, why to set next-hop
> manually; this is waht my concern is.
>
> Thanks
> Gops
>
> ________________________________
>
> From: Joel Amao [mailto:femmy79@hotmail.com]
> Sent: Friday, November 23, 2007 21:14
> To: Gupta, Gopal (NWCC); Cisco certification
> Subject: RE: BGP Next-Hop
>
>
>
> Hello Gupta,
>
> what you are seeing is normal and expected.
>
> There is an exception to egbg next hop modification in broadcast and
> NBMA mode called third-party next hop modification.
>
> The normal rule regarding next-hop modification is below;
>
> 1. If the route is locally originated set the NEXT-HOP to the peering
> ip address (even if sent to an IBGP peer)
>
> 2. If the route is propagated to an eBGP peer, set the NEXT-HOP to our
> peering ip address
>
> 3. If the route is propagated to an iBGP peer, do not change the
> NEXT-HOP
>
> **exception to this rule **When two peers are in a multiaccess network
> (Frame Relay multipoint interface, Ethernet, etc) we dont change the
> next-hop.
>
>
>
> thanks,
>
> Joel Amao
> CCIE#18128
>
>
>
>
>
>
>
>
> > Subject: BGP Next-Hop
> > Date: Fri, 23 Nov 2007 19:33:56 +0530
> > From: gopal.gupta@hp.com
> > To: ccielab@groupstudy.com
> >
> > 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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>
>
>
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>
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-- Narbik Kocharians CCIE# 12410 (R&S, SP, Security) CCSI# 30832 www.Net-WorkBooks.com
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