Users Guide
default algorithm does not provide a satisfactory distribution of trac, 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 trac across the members.
hash-algorithm ecmp
Change the hash algorithm used to distribute trac ows 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-specic. 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(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-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 conguration is crc-lower. This command takes the lower 32 bits of the hash key to
compute the egress port and is the “fall-back” conguration if you have not congured anything else.
Equal Cost Multi-Path (ECMP)
551