Reference Guide

Usage
Information
Using CONFIGURATION mode, create an ECMP group ID. You can then assign
interfaces to the ECMP group using CONFIGURATION ECMP-GROUP mode. You
can also enable on the port-channel configuration using the CONFIGURATION
ECMP-GROUP command mode.
hash-algorithm
Changes the hash algorithm used to distribute traffic flows across a Port Channel.
S5000
Syntax
hash-algorithm [algorithm-number] | [ecmp {crc | crc-upper |
xor | dest-ip | lsb] | [lag {crc | xor} | [seed]
To return to the default hash algorithm, use the no hash-algorithm command.
To return to the default Equal-cost Multipath Routing (ECMP) hash algorithm, use
the no hash-algorithm ecmp algorithm-value command.
Parameters
algorithm-
number
Enter the algorithm number. The range is 0 to 47.
ecmp (OPTIONAL) Enter the ecmp keyword followed by the crc,
crc-upper, xor, dest-ip, or lsb keywords to specify the
metric on which to base route calculations for load
balancing.
lag (OPTIONAL) Enter the lag keyword followed by the crc or
xor keywords to specify routing metrics for a specific port-
channel.
seed Enter a value with which to seed the algorithm. The range is
0 to 2147483646.
Command
Modes
CONFIGURATION
Command
History
Version 9.0(1.3) Introduced on the S5000.
Usage
Information
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.
454
Equal Cost Multi-Path Overview (ECMP)