From: Joel Amao (femmy79@hotmail.com)
Date: Fri Nov 23 2007 - 12:44:17 ART
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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