load balancing - parallel links, parallel routers

[p.kodzis]

hello,

I need to load balance traffic over 2x2Mbps links connected to two different routers in each location. I am going to use eigrp, GRE tunnels and HSRP like on the picture http://republika.pl/kodzis/Drawing1.gif

Is that optimal solution?

best regards

[rsissons · Accepted solution]

That should work fine. The router will automatically load share over, up to 4, equal cost paths but at the session level so you may not get equal utilisation.

You can force the router to load share on a per packet basis by turning off fast switching, 'no ip route-cache', on the interface, but this is NOT recommended as it will severely impact the routers performance.

To get load sharing with HSRP you can use 2 standby groups and point half of your end devices to each.

See the following URL for more information on this -

http://www.cisco.com/univercd/cc/td/doc/cisintwk/ics/cs009.htm

[thisisshanky · Accepted solution]

You can additionally, use per packet LB on each router, with CEF enabled.

interface commands would have ip load-sharing per-packet on both serial interfaces, and before doing this, you should globally enable CEF using ip cef command in global mode.