[c-nsp] bgp maximum-paths

[Bill Blackford]

Phil Smith has some good introductory slides on the nanog archive. There are lots of tools for attempting to influence the return path of your traffic. (Assuming this is the load balancing you're trying to do). Selective prepending, announcing sub-aggregates along with your full aggregate, etc. 

-b


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Chris Gotstein
Sent: Wednesday, April 14, 2010 2:26 PM
To: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] bgp maximum-paths

Does this seem like a valid way to load balance?

http://ccnalab.net/bgp-routing/bgp-load-sharing-2-isp/

---- ---- ---- ----
Chris Gotstein, Sr Network Engineer, UP Logon/Computer Connection UP
http://uplogon.com | +1 906 774 4847 | chris at uplogon.com

On 4/14/2010 4:23 PM, MrPaul wrote:
> On Wed, Apr 14, 2010 at 3:03 PM, Chris Gotstein <chris at uplogon.com
> <mailto:chris at uplogon.com>> wrote:
> 
>     We are a multi-homed ISP with connections to 2 different providers (AS
>     Numbers)  Does the bgp maximum-paths 2 command have any effect on load
>     balancing between the 2 connections since they are different AS's or
>     does that command only work when you have multiple paths to the same AS?
> 
> 
> Taken from
> http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00800945bf.shtml
> 
> By default, BGP chooses one best path among the possible equal-cost
> paths that are learned from one AS. However, you can change the maximum
> number of parallel equal-cost paths that are allowed. In order to make
> this change, include the maximum-paths paths  command under the BGP
> configuration. Use a number between 1 and 6 for the paths  argument.
> 
> That feature is only of use if you are dual-homed to the same AS.
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