Users Guide

Term heading Description heading
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, see
the relevant Dell Networking OS Command Line Reference Guide.
Version Description
9.10(0.1) Introduced on the S6010-ON and S4048T-ON.
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.
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.
The different hash algorithms are based on the number of ECMP group members and
packet values. The default hash algorithm yields the most balanced results in various
test scenarios, but if the default algorithm does not provide satisfactory distribution of
traffic, use this command to designate another algorithm.
When a member leaves or is added to the ECMP group, the hash algorithm is
recalculated to balance traffic across the members.
Equal Cost Multi-Path (ECMP) 741