Service Manual

hash-algorithm ecmp
Change the hash algorithm used to distribute traffic flows across an ECMP (equal-cost multipath routing)
group.
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 Uses the upper 32 bits of the key for the hash computation.
The default is crc-lower.
dest-ip Uses the destination IP for ECMP hashing. The default is
enabled.
lsb Returns the LSB of the key as the hash. The default is crc-
lower.
Defaults
• crc-lower
• dest-ip enabled
Command Modes CONFIGURATION
Command History
This guide is platform-specific. For command information about other platforms,
refer to the relevant Dell Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version Description
9.8(0.0) Introduced on the S3048-ON and S4048-ON.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.7.0 Introduced on the S4810.
8.1.1.0 Introduced on the E-Series ExaScale.
7.6.1.0 Introduced on the S-Series.
7.5.1.0 Introduced on the C-Series.
Usage Information The hash value calculated with the hash-algorithm command is unique to the
entire chassis. The default ECMP hash configuration is crc-lower. This command
takes the lower 32 bits of the hash key to compute the egress port and is the “fall-
back” configuration if you have not configured anything else.
Equal Cost Multi-Path (ECMP)
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