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OSPF and unequal cost load balancing

Hi,

Quick question regarding OSPF and unequal cost load balancing.

I know that OSPF does not support this and have realised that i can either adjust the costs for the interface or reconfigure to EIGRP.Are there any other options?

Regards

mark

2 REPLIES

Re: OSPF and unequal cost load balancing

Thats the best you can do by tweaking costs, which makes it equal cost load balancing. Or reconfigure the entire RP to EIGRP (which probably is a major change in your network if its big).

Even with equal costs, if you have two links one that is a T1, and one that is 56k, you will experience congestion across the 56k, as both are considered equal costs by OSPF. It doesnt share the traffic (balance it out) across both the links according to the bandwidth of the link. (Which EIGRP can).

You can instead use PBR to send traffic from specific subnets across each link (or even based on applications). This will over ride routes populated via OSPF on the router.

Cisco Employee

Re: OSPF and unequal cost load balancing

You could use MPLS TE to achieve that goal but that would be another story.

Hope this helps,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
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