Re: BGP Router-ID

From: niko (niko@4ovek.com)
Date: Tue Feb 01 2005 - 21:42:27 GMT-3

I have also read that when OSPF is the IGP, it is recommended that the OSPF
& BGP RID do match:
****************************************************************************
*
If OSPF is the IGP of BGP, and SYNC is enabled - the RID must be the same:
---------------------------------------------------------------------------- 

----
router ospf 1
 router-id 2.2.2.2

router bgp 24
 bgp router-id 2.2.2.2
----------------------------------------------------------------------------
----
* If manually change RID, do it for BOTH OSPF & BGP.
* If not, the Router will select the HIGHEST Loopback IP or Interface IP
address for both Routing Processes.
****************************************************************************
*******
Nikolai

----- Original Message ----- 
From: "James Matrisciano" <jmatrisciano@kenttech.com>
To: "Bajo" <bajoalex@gmail.com>; "Jonathan ZD" <Nuvo25@hotmail.com>
Cc: "CCIE - GS" <ccielab@groupstudy.com>
Sent: Tuesday, February 01, 2005 1:04 PM
Subject: RE: BGP Router-ID

Main "gotchya" on the BGP-ID is to make sure that if you are running
sync on and the route is learned from a different router-id in the IGP
that you have a matching router-id in your bgp advertisements,
otherwise, the learning router will not advertise this route as the
router-id does not match up right.

jm

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Bajo
Sent: Tuesday, February 01, 2005 3:49 PM
To: Jonathan ZD
Cc: CCIE - GS
Subject: Re: BGP Router-ID

Jonathan it will be valid only if

a) either the address is a loopback interface or
b) a physical interface address.

The interface does NOT need to be running BGP.

Take a look at Jeff Doyle's Routing TCP/IP Vll, page 154.

On Tue, 1 Feb 2005 12:03:22 -0800, Jonathan ZD <Nuvo25@hotmail.com>
wrote:
> Is it neccessary that BGP Router-ID has to be reachable by its
BGP-peers. For
> example, if the following configuration valid?
>
> Rtr 01
>
> router bgp 100
> bgp router-id 1.1.1.1
> nei 192.168.21.2 remot 100
>
> ---------
>
> Rtr 02
>
> router bgp 100
> bgp router-id 2.2.2.2
> nei 192.168.21.1 remot 100
>
> *** The router-id (1.1.1.1 and 2.2.2.2), in this case, is not
reachable by IGP
> between both routers.
>
> ----------
>
> Thanks
>
>

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