From: Narbik Kocharians (narbikk@gmail.com)
Date: Fri Nov 23 2007 - 12:28:16 ART
Gupta did you say that these guys are all in their individual AS?
On 11/23/07, Victor Cappuccio <vcappuccio@gmail.com> wrote:
>
> Hi Gupta,
>
> is 155.1.0.1 an external neighbor in your topology :)
>
> Example:
> WG6R3(config-router)#do show ip bgp neigh 4.4.4.4 | in external
> BGP neighbor is 4.4.4.4, remote AS 4, external link
> WG6R3(config-router)#!So you can not configure Next-Hop-Self here
> WG6R3(config-router)#neigh 4.4.4.4 next-hop-self
> %BGP: next-hop-self is implied for an eBGP peer, there is no need to
> configure it
> WG6R3(config-router)#do show ip bgp neigh 2.2.2.2 | in internal
>
> EBGP next hops shall be announced using the IGP or you must Redistribute
> connected interfaces into the IGP at the edge routers, or you must Include
> links to EBGP neighbors into the IGP and configure them as passive
> interfaces
>
> You can configure an edge router to set its IP address as the next-hop
> address even when the BGP updates are sent across IBGP sessions. As a
> result, there is no need for the receiver of the IBGP information to know
> how to reach the far end of the EBGP session, because that IP address is
> no
> longer set as the next hop.
> Both EBGP and IBGP sessions forward BGP updates but in slightly different
> ways. BGP attributes are not changed when an update is sent across an IBGP
> session unless next-hop-self is configured.
>
> HTH
>
> Victor Cappuccio
> www.vcappuccio.wordpress.com
>
> On Nov 23, 2007 3:03 PM, 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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>
>
>
> --
>
> _______________________________________________________________________
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-- Narbik Kocharians CCIE# 12410 (R&S, SP, Security) CCSI# 30832 www.Net-WorkBooks.com
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