From: Narbik Kocharians (narbikk@gmail.com)
Date: Fri Nov 23 2007 - 13:33:39 ART
Therefore no need to set the next hop
On 11/23/07, Narbik Kocharians <narbikk@gmail.com> wrote:
>
> The assumption here is that on a given multiaccess networks, every host
> has reachability to every other host.
>
> On 11/23/07, Narbik Kocharians <narbikk@gmail.com> wrote:
> >
> > 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
> > > >
> > > >
> > > _______________________________________________________________________
> > >
> > > > Subscription information may be found at:
> > > > http://www.groupstudy.com/list/CCIELab.html
> > >
> > >
> > >
> > > ________________________________
> > >
> > > Connect and share in new ways with Windows Live. Connect now!
> > > <http://www.windowslive.com/connect.html?ocid=TXT_TAGLM_Wave2_newways_11
> > > 2007>
> > >
> > > _______________________________________________________________________
> > >
> > > Subscription information may be found at:
> > > http://www.groupstudy.com/list/CCIELab.html
> > >
> >
> >
> >
> > --
> > Narbik Kocharians
> > CCIE# 12410 (R&S, SP, Security)
> > CCSI# 30832
> > www.Net-WorkBooks.com <http://www.net-workbooks.com/>
> >
>
>
>
> --
> Narbik Kocharians
> CCIE# 12410 (R&S, SP, Security)
> CCSI# 30832
> www.Net-WorkBooks.com <http://www.net-workbooks.com/>
>
-- Narbik Kocharians CCIE# 12410 (R&S, SP, Security) CCSI# 30832 www.Net-WorkBooks.com
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