From: James (james@towardex.com)
Date: Sat Jun 26 2004 - 01:01:21 GMT-3
the best way to select IBGP peering interface is always your loopback interface.
loopbacks never go down regardless of physical interface status. if you peer to
ethernet0/0, and ethernet0/0 goes offline, it will kill your ibgp session. whereas,
if you peer to loopback0, and if the router is properly homed into IGP with redundant
connection (i.e. ethernet0/1), then IGP can take care of the routing for the peering
end points.
unless of course, the lab specifically instructs you to use non-loopback interface
for ibgp session :)
-J
On Fri, Jun 25, 2004 at 09:50:06PM -0400, Kenneth Wygand wrote:
> Art,
>
> Keep in mind that BGP rides on top of your existing IGP routing domain, so the addresses you peer from/to will affect the IGP path a particular packet takes to get from source to destination.
>
> The choice of interfaces, again, is up to you if not explicitly stated. It might be more practical to select peering interfaces with consideration to the underlying IGP routes packets will take to construct the peering you set forth.
>
> Also, the CCIE lab is results-oriented. If your solution works, you get the points. Period.
>
> HTH,
> Ken
>
> -----Original Message-----
> From: nobody@groupstudy.com on behalf of Art Lee
> Sent: Fri 6/25/2004 8:57 PM
> To: ccielab@groupstudy.com
> Cc:
> Subject: INE Lab 17 BGP 6.1-6.5, In general
>
>
>
> On my first pass thru the peering, I used different interfaces than in
> the solution. Of course, I had some adj. problems.
>
> In general, for a lab like this with the general instructions for
> setting up peering, how do you determine which interface(s)
> to use for peering, especially if you have 2 choices?
>
> I'm asking because to use the solutions for 6.8, I had to use the
> solution choice of interfaces. With my original choice of peering
> interfaces, I had full BGP connectivity but had to use a different
> route-map solution (origin-incomplete) to get that to work.
>
> I guess I am asking about the actual lab & how do you select the "best"
> or "correct" peering interface for the task requested. I don't
> understand how the peering interfaces were chosen for R1, R2, & R3, in
> particular, why pick ethernet over the serial links......
>
> Art
>
> --
> ***********************
> Art Lee
>
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-- James Jun TowardEX Technologies, Inc. Technical Lead Network Design, Consulting, IT Outsourcing james@towardex.com Boston-based Colocation & Bandwidth Services cell: 1(978)-394-2867 web: http://www.towardex.com , noc: www.twdx.net
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