Configuring EIGRP with multiple routes

[mfouts]

Please advise on the following. Thanks in advance.

I maintain a network which currently consists of PIX515 firewall, 3600 series router, redundant 4006's with L3 module at the core and catalyst 3500 series switches on the edge. Currently, we have one ISP and planning to add another. We've purchased another PIX515 and a 265x router to support the additional ISP. Basically, I want to configure EIGRP on the 4006 with multiple routes in which the gateway (route) depends on the source and/or destination. Is this possible?

[vaughan.lee]

EIGRP will only build a routing table according to the destination address, so you will need to incorporate policy based routing as well. An explanation of how this works can be found at http://www.cisco.com/en/US/partner/tech/tk648/tk365/technologies_tech_note09186a008009481d.shtml

Be aware, though, that because you route traffic out of one gateway, dependent on the addressing used externally, there is not neccessarily a guarantee that the return traffic will come back in through the same gateway.

[wolfrikk]

Yes, EIGRP supports both equal cost and unequal cost load balancing. If the links do not have equal metrics, you can use the "variance" command in the EIGRP process to put acceptable limits to the unequal cost load balancing.