RE: eBGP peering one side with loopback IP

Mathew,

R1

---
router bgp 100
 neighbor 12.0.0.2 remote-as 200
 neighbor 12.0.0.2 update-source Loopback0
R2
---
router bgp 200
neighbor 1.1.1.1 remote-as 100
neighbor 1.1.1.1 ebgp-multihop 255
R1#sh ip bgp all summ
BGP router identifier 1.1.1.1, local AS number 100
BGP table version is 1, main routing table version 1
Neighbor        V    AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
12.0.0.2        4   200      11      11        1    0    0 00:08:35        0
As long as you source your update messages from the Lo0 on R1, and you have neighbor statement " Neighbor 1.1.1.1" on R2. Hence, R2 should know how to reach Lo0 of R1. It's doable.
HTH,
Mohammad Mousa
CCIE #36990 
> Date: Thu, 18 Jul 2013 06:08:14 +1000
> Subject: Re: eBGP peering one side with loopback IP
> From: mathewfer_at_gmail.com
> To: nadeemkool_at_yahoo.com
> CC: ccielab_at_groupstudy.com
> 
> Hi Nadeem,
> 
> Thanks for the reply,
> It looks like you have used loopback IP on both routers.
> What I am looking for is for only one side to use loopback IP for peering &
> other router to use its directly connected interface for peering.
> 
> Any more ideas?
> 
> Mathew.
> 
> On Thursday, July 18, 2013, Nadeem Anjum wrote:
> 
> > R1(fa0/0)---------R2(Lo0)
> >
> > R1
> > router bgp 100
> > neigh 2.2.2.2 remote-as 200
> > neigh 2.2.2.2 multihop 255
> >
> > R2
> > router bgp 200
> > neigh 1.1.1.1 remote-as 100
> > neigh 1.1.1.1 multihop 255
> >
> >
> >
> > Thanks,
> > Nadeem Anjum
> >
> >   ------------------------------
> >  *From:* Mathew <mathewfer_at_gmail.com <javascript:_e({}, 'cvml',
> > 'mathewfer_at_gmail.com');>>
> > *To:* Cisco certification <ccielab_at_groupstudy.com <javascript:_e({},
> > 'cvml', 'ccielab_at_groupstudy.com');>>
> > *Sent:* Wednesday, July 17, 2013 6:24 PM
> > *Subject:* eBGP peering one side with loopback IP
> >
> > Hi
> >
> > What is the minimum eBGP peer configuration to get 2 directly connected
> > routers (back-to-back) but one router to use the IP of a loopback of the
> > other router?
> >
> > I hope it is possible to establish ebgp peer.
> >
> > Any help?
> >
> > Mathew
> >
> >
> > --
> > Thanks
> >
> > Mathew
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> 
> -- 
> Thanks
> 
> Mathew
> 
> 
> Blogs and organic groups at http://www.ccie.net
> 
> _______________________________________________________________________
> Subscription information may be found at: 
> http://www.groupstudy.com/list/CCIELab.html
Blogs and organic groups at http://www.ccie.net