Load balancing betn ether drop & multilink

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Aug 3rd, 2007
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i have load balanced between etherdrop & multilink in ospf ...Applied same QOS on both link but i have observed that on multilink packets are being droped in QOS & same on etherdrop is fine without any drop ..

please help me........

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Richard Burts Fri, 08/03/2007 - 08:45
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You have not provided any details of how you got the load balancing to work. Am I correct in assuming that you did it by creating 2 equal cost routes (using something like static routes or RIP that are not sensitive about the bandwidth of the interfaces)? The results that you are experiencing are not unusual when you treat 2 paths as equal that have very different capacity. The forwarding engine has 2 equal paths to use and will attempt to send equal amounts of traffic on each. So frequently one of the links will be quite underutilized and one of the links will be very overutilized.

My suggestion is that you not attempt to treat both paths as equal and do not load balance over them. If you want utilization on both links I would suggest that you set up normal routing to use one of the links and set up Policy Based Routing to identify some type of traffic (maybe web traffic, maybe FTP traffic, maybe traffic from some particular source subnet) and send that traffic over the other link. This will give you utilization on both links and not overload one of the links.



manik.palekar Sun, 08/05/2007 - 10:56
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Dear Rick ,

Thax for ur update ...

Both multilink & etherdrop are 8 Mbps each ..configured same ospf cost on both with per packet load balancing & redundant


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