RE: [isp-bgp] multipath BGP

["Edward Brookhouse" <ebroo@...>]

Charles,

Thanks for the reply! I have been doing some research, but I have been
unable to find a good example resource for setting up the announcement
of local preferences.

Could you possibly suggest any sites/docs etc that you feel would be a
good place to start reading?

Thanks

Edward


-----Original Message-----
From: Charles Gucker [mailto:cgucker@...] 
Sent: Friday, June 10, 2005 5:40 PM
To: isp-bgp@isp-bgp.com
Subject: Re: [isp-bgp] multipath BGP

On 6/6/05, Edward Brookhouse <ebroo@...> wrote:
> Hi all,
> 
> This may not be the appropriate list, but I thought I would give it a
> shot.

     It's as good as others :)  BGP is the main driver, so I'd say it's
on 
topic.

> I am in the process of setting up a vanilla multipath BGP setup to two
> providers.
> 
> What do I have to do to make sure incoming path selection is working
> right?
> 
> For example:
> 
> My goal is to have one active and one standby (using hsrp) router each
> announcing my local blocks and getting only default bgp routes from
> Sprint/MCI.
> 
> But how do I make sure that traffic destined for a MCI block comes in
> the MCI circuit vs the sprint?

    Well, if you want to force this action, you will have to turn on
send-community
with Sprint and UU.  

For the Sprint block, you will want to send UU a community
of 701:80  to set it's local preference within UU to 80 (so when you
announce the
sprint route to Sprint, it will be prefered, even from UU's network).

Then you will have to do the same for the UU block via Sprint with a
community
of 1239:70.

If you are wondering where I got the communities from, I have the
community
guided collected at:  http://www.onesc.net/communities  

> If both routers are announcing the blocks and no dynamic IGP is
running
> between them - yes the two routers will bgp peer together but will
this
> take care of it.

The idea here would be that if your Sprint session failed, both
netblocks would
come back down your UU circuits and vice versa.

charles

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