Re: BGP Load Balancing

Joseph,

In "Provider+default routes" case Tier-I ISP's also cannot provide much of
help.The upstream peers can manipulate the traffic.

The outbound traffic will load balance(not perfectly but still...) but
inbound will always have an issue.

On Tue, Aug 28, 2012 at 8:36 PM, Joseph L. Brunner
<joe_at_affirmedsystems.com>wrote:

> No true.. it's much more likely you will see inbound traffic load balanced
> as your carriers run default-less - as do their upstream peers...
>
> Your unique /24 (or whatever length) netblocks will be sent through the
> internet from both of your sources, and random traffic will come in via
> either, assuming no other attributes are changed between providers...
>
> Now, outbound is much harder in that scenario... with cef enabled (and it
> has to be for many reasons) you would need some per-packet load balancing
> and that may not be what you want if one carrier is much better connected
> or just plain faster than another...
>
> I would recommend if you truly want to load balance, forget about
> default-only and take "Provider + default routes" this way you are assured
> to send traffic to your provider to get to mutual customers... this works
> best when you ISP's are 2 great ones, like Level3 and ATT. It works not so
> great when you use Level3 and Cogent let's say - as Cogent has all sorts of
> bad routing policies and you will not have much luck.
>
> Thanks!
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Nicky
> Sent: Tuesday, August 28, 2012 11:00 AM
> To: ccielab_at_groupstudy.com
> Subject: BGP Load Balancing
>
> Hi All,
>
> If there are two ISP terminating on two different routers and only default
> route is accepted from ISP then can I load balance the traffic?
>
> AFAIK the outgoing traffic will be load balanced but not possible for
> incoming traffic.
>
> Regards,
> Nick
>
>
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Received on Tue Aug 28 2012 - 20:48:12 ART