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[isp-bgp] RE: Sample BGP Config
Howdie,
From what you are saying you are describing the default behaviour of BGP. Your two BGP routers will "know" what the shortest AS path is to a certain AS through their iBGP session.
i.e. if router A has a shorter path through provider A to an AS then router B will know that and forward traffic for that AS through router A.
Load balancing and BGP is the route to madness... :) ... unless you have a reason to ( like you circuits getting maxed to one of the providers ) my advice is not to seek to influence the traffic for the sake of it.
I recommend Sam Halabi's Internet Routing Architecture's from Cisco Press for a read on the how/why/where of BGP.
regards,
mike
-----Original Message-----
From: Christopher J. Wolff [mailto:chris@...Sent: Wednesday, 16 July 2003 9:59 a.m.
To: isp-bgp@isp-bgp.com
Subject: [isp-bgp] RE: Sample BGP Config
Michael,
Thanks for the response. The example I read was "Load Sharing when
Multihomed to Two ISPs via Multiple Local Routers"
The outbound traffic policy in this example limits traffic to one of the
two providers unless there is a failure.
The outbound traffic policy is as follows:
Traffic destined to AS 300 goes via the R1 - ISP(A) link.
Traffic destined to AS 400 goes via the R2 - ISP(B) link.
All other traffic should prefer default route 0.0.0.0 via the R1 -
ISP(A) link.
If the R1 - ISP(A) link fails, all traffic should go via the R2 - ISP(B)
link.
I'd like to have outbound traffic take the shortest path if both ISP's
are up and fail over to the other ISP if one ISP link fails.
Christopher J. Wolff, VP CIO
Broadband Laboratories, Inc.
http://www.bblabs.com
-----Original Message-----
From: Michael Weinstock [mailto:MWeinstock@...Sent: Tuesday, July 15, 2003 2:50 PM
To: isp-bgp@isp-bgp.com
Subject: [isp-bgp] RE: Sample BGP Config
Hello,
You didnt like it? Perhaps specify what you didnt like... As the answer
will be based on Cisco's docs.
-----Original Message-----
From: Christopher J. Wolff [mailto:chris@...Sent: Wednesday, 16 July 2003 9:47 a.m.
To: isp-bgp@isp-bgp.com
Subject: [isp-bgp] Sample BGP Config
Hello,
I'm looking for a couple of sample cisco configs that illustrate two
multihomed routers connected by an IGP session. For example;
Router 1----------Isp 1
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IGP
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Router 2----------Isp 2
I read the Cisco scenarios for multihomed networks documents but I
didn't like what I read. Thank you in advance.
C.J. Wolff, VP CIO
Broadband Laboratories, Inc.
http://www.bblabs.com
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