Load Balancing of Unequal Ethernet Bandwidth

5 pts.
Tags:
Bandwidth
Bandwidth management
Cisco
Cisco router configuration
Ethernet
Load balancing
Network administration
Network Load Balancing
Router configuration
Routers
Is it possible to aggregate and then load balance the unequal ethernet circuits like so: I have two ethenet circuits on my Cisco router. Both have equal costs to the next hop. Ethernet Circuit #1- 200M Ethernet Circuit #2 - 100M Can I aggregate both ethernet circuits so that the total amount of bandwidth available is 300M? Can I then load balance it so both circuits are equally utilized? For example... * If I have 150M of traffic flowing to the next hop then the router would spread the load across both links like so: 100M through Ethernet Circuit #1. 50M through Ethernet Circuit #2. * The formula to use for this would be: Utilization / Total Bandwidth = percentage of utilization required per link 150/300 = 0.5 0.5 x bandwidth of Ethernet #1 = 0.5 x 200 = 100M 0.5 x bandwidth of Ethernet #1 = 0.5 x 100 = 50M * If there was a total of 250M of traffic flowing to the next hop, and applying the formula above, the router would work out that the load distributed across both ethernet links would be: 166M through Ethernet Circuit #1. 84M through Ethernet Circuit #2. Any ideas??? Thanks. Andy
ASKED: February 16, 2009  5:28 AM
UPDATED: May 13, 2010  4:07 PM

Answer Wiki

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You could do this with the bandwidth command on each interface (to make the routing protocol identify the difference in speed), and using the variance command with EIGRP (for unequal load balancing).

This would assume that you could run EIGRP…

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