From: Carlos G Mendioroz (tron@xxxxxxxxxxx)
Date: Wed Jun 05 2002 - 08:02:15 GMT-3
Or you can mix and match:
RtrA (s0) ----- (s0) RtrB (l0 - 2.2.2.2)
RtrA #
router bgp 100
neighb 2.2.2.2 remote-as 200
neighbor 2.2.2.2 ebgp-multihop
RtrB #
router bgp 200
neighb 192.168.1.1 remote-as 100
neighb 192.168.1.1 update-source loop 0
neighb 192.168.1.1 ebgp-multihop
Although it seems not a very usefull thing. Loopback neighbours
are common for load balancing over paralel links between peers...
Nick Shah wrote:
>
> Alex,
>
> both are correct.
>
> You can use directly connected interface address or you can use loopback
> interface, if you choose first one, you can use neighbor x.y.z.a (directly
> connected address), if you use loopback interface, u use neighbor x.y.z.a
> (remote loopback address). for eg.
>
> Rtr (S0 - 192.168.1.1/30) ------directly connected to ------ RtrB(S0 -
> 192.168.1.2/30) then you will use the following commands ...
>
> RtrA #
> router bgp 100
> neighbor 192.168.1.2 remote-as 200
>
> RtrB#
> router bgp 200
> neighbor 192.168.1.1 remote-as 100
>
> if you are using loopbacks then...
>
> RtrA (loopback address 1.1.1.1) -------S0 --------S0 (of RtrB) --- (loopback
> address 2.2.2.2)
>
> RtrA #
> ip route 2.2.2.2 255.255.255.255 s0
>
> router bgp 100
> neighbor 2.2.2.2 remote-AS 200
> neighbor 2.2.2.2 update-source loopback0
> neighbor 2.2.2.2 ebgp-multihop
>
> RtrB#
> ip route 1.1.1.1 255.255.255.255 S0
>
> router bgp 200
> neighbor 1.1.1.1 remote-as 100
> neighbor 1.1.1.1 update-source loopback0
> neighbor 1.1.1.1 ebgp-multihop 2
>
> If you are using the same config (with loopbacks as update source) for IBGP
> neighbors, then you dont specify ebgp-multihop (but you still specify update
> sourece loopback0)
>
> hth
> Nick
>
> -----Original Message-----
> From: Alex Rhyubisef <foselkr@yahoo.co.kr>
> To: ccielab@groupstudy.com <ccielab@groupstudy.com>
> Date: Wednesday, 5 June 2002 6:36
> Subject: about EBGP neighbor ip address
>
> >hi, all
> >
> >i have a question about ebgp.
> >when we configure ebgp,
> >1. we use direct connected interface address
> >2. we use loopback address with ebgp multihop 255
> > and update source loopback0
> >
> >is #1 or #2 correct ?
> >
> >
> >thanks in advance.
> >
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