From: ying chang (ying_c@xxxxxxxxxxx)
Date: Fri Apr 05 2002 - 20:21:25 GMT-3
The web page is for a single AS, not multiple ASes that Atul was looking
for. Here's another web page that has BGP load balancing info:
http://www.cisco.com/warp/public/459/40.html
Close to the end of the page, it said:
"In a multihomed environment with two ISPs, load-balancing is not a possible
since BGP selects only the single best path to a
destination among the BGP paths learned from different ASes. The best we can
achieve in such multihomed BGP networks is
load sharing. Based on predetermined policies, traffic flow is controlled
using different BGP attributes."
I beleive the above statement is true, the best you can do is split the
load, not the load balancing we would like to see as shown in Halabi's web
page. I had the same impression as Atul has and thought 'no bgp bestpath
compare-routerid', 'maxpath X' and careful planning should make it work, but
I never could make it to work and concluded that you can only do load
balancing from a single AS.
Please correct me if I'm wrong, I'd love to learn how to make this work.
Thanks,
Chang
>From: "David Lee Steele, Jr." <d.steele2@comcast.net>
>Reply-To: "David Lee Steele, Jr." <d.steele2@comcast.net>
>To: ccielab@groupstudy.com
>Subject: RE: BGP Load balancing
>Date: Fri, 05 Apr 2002 16:26:40 -0500
>
>Check out the following and see if it helps.
>
>http://www.cisco.com/warp/customer/459/13.html
>
>There is a little section on Load Balancing near the middle of the page.
>
>David Lee Steele, Jr.
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>ying chang
>Sent: Friday, April 05, 2002 3:38 PM
>To: Samb@cisco.com; atulpawar@hotmail.com; ccielab@groupstudy.com
>Subject: Re: BGP Load balancing
>
>I can only make it work when the network coming from the same AS. Are
>you
>sure we can do it with multiple ASes?
>
>Chang
>
>
> >From: "Sam" <Samb@cisco.com>
> >Reply-To: "Sam" <Samb@cisco.com>
> >To: "atul pawar" <atulpawar@hotmail.com>, <ccielab@groupstudy.com>
> >Subject: Re: BGP Load balancing
> >Date: Fri, 5 Apr 2002 11:17:46 -0800
> >
> >you need to say maxpath X, where X from 1- 8, 1 is by default
> >
> >----- Original Message -----
> >From: "atul pawar" <atulpawar@hotmail.com>
> >To: <ccielab@groupstudy.com>
> >Sent: Friday, April 05, 2002 12:40 PM
> >Subject: BGP Load balancing
> >
> >
> >Hi Guyes
> >If AS1 is getting information about Network X from AS2 and AS3 via
>ebgp.
> >If all metrics are similar the last criteria used to choose the best
>path
> >is
> >Lowest router ID. If I use the command
> >'no bgp bestpath compare-routerid' will it do the load balancing?
> >
> >Atul
> >
> >
> >
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