From: Felix Nkansah (felixnkansah@gmail.com)
Date: Wed Aug 13 2008 - 16:50:34 ART
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_example09186a0080211f5c.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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