Hash-Algorithm Ecmp - Dell Z9500 Reference Manual

The line-card option is applicable with the lag-hash-align microcode only. Any
other microcode returns an error message as follows:
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In addition, the linecard slot-id ip-sa-mask value ip-da-mask value
option has the following behavior to maintain bi-directionality:
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The different hash algorithms are based on the number of Port Channel members
and packet values. The default hash algorithm (number 0) yields the most balanced
results in various test scenarios, but if the default algorithm does not provide a
satisfactory distribution of traffic, use the hash-algorithm command to designate
another algorithm.
When a Port Channel member leaves or is added to the Port Channel, the hash
algorithm is recalculated to balance traffic across the members.

hash-algorithm ecmp

Change the hash algorithm used to distribute traffic flows across an ECMP (equal-cost multipath routing)
group.
Z9500
Term heading Description heading
Syntax
hash-algorithm ecmp {crc-upper} | {dest-ip} | {lsb}
To return to the default hash algorithm, use the no hash-algorithm ecmp
command.
Parameters
crc-upper
Equal Cost Multi-Path (ECMP)
Dell(conf)#hash-algorithm linecard 5 ip-sa-mask ff ip-da-
mask ff
% Error: This command is not supported in the current
microcode configuration
When hashing is done on both IPSA and IPDA, the ip-sa-mask and ip-da-
mask values must be equal. (Single Linecard).
When hashing is done only on IPSA or IPDA, the system maintains bi-
directionality with masks set to XX 00 for line card 1 and 00 XX for line card 2
(ip-sa-mask and ip-da-mask). The mask value must be the same for both
line cards when using multiple line cards as ingress (where XX is any value from
00 to FF for both line cards). For example, assume that traffic is flowing
between line card 1 and line card 2:
hash-algorithm linecard 1 ip-sa-mask aa ip-da-mask 00
hash-algorithm linecard 2 ip-sa-mask 00 ip-da-mask aa
Uses the upper 32 bits of the key for the hash computation.
The default is crc-lower.
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