RE: OT Two internet Connection load balancing

From: Dufour, Andre (Andre.Dufour@PAETEC.com)
Date: Wed Aug 13 2008 - 17:03:11 ART


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-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Felix Nkansah
Sent: Wednesday, August 13, 2008 2:51 PM
To: darth router
Cc: Cisco certification
Subject: Re: OT Two internet Connection load balancing

Hi Darth,

I dont know whether I get you right or not, but I would say any Cisco
router

with modern IOS should be able to do that.

It's typically a combination of IP SLA, object tracking, policy NATing,
and

policy routing.

You accomplish load-balancing by using PBR to send out different groups
of

sources out different internet links, while tracking the state of each
link

so you can failover onto another link which you specify to be secondary
for

that source group.

The document below may prove useful

http://www.cisco.com/en/US/tech/tk364/technologies_configuration_example
09186a0080211f5c.shtml

However, it's a very simple configuration example. It gets more complex
if

you have to do NAT on the router, in which case you need to use policy

NATing.

Let me know if this isnt very clear. I could get provide more details.

In short, use IP SLA to keep uptime statistics on the links, Object
Tracking

to track the IP SLA objects, PBR to load balance traffic based on the

source, and the 'next-hop verify-reachability' feature to help fail over
to

the other links if one goes off.

Regards,

Felix

Blogs and organic groups at http://www.ccie.net



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