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Due to JunOS and Cisco documentation there is ability to configure hashing algorithm choosing one of the next-hop from the several multiple equal-cost paths. There is information about fields that could be used to compute target hash - it could be l3 (including src and dst ips) or l4 (including ports) but there is no any information how exactly (crc, xor, and+xor, etc) this hash sum computed. Is there any standard of this behaviour or this is a proprietary and brand/model dependent?

Alexander Klimenko
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Here's a document that explains the algorithm for a Cisco 3750, 4500 and 6500. It's too long to quote here.

Ron Trunk
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