Reference Guide

Term heading Description heading
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.
hash-algorithm seed
Select the seed value for the ECMP, LAG, and NH hashing algorithm.
S4820T
Syntax
hash-algorithm seed value [linecard slot] [port-set number]
Parameters
seed value Enter the keyword seed then the seed value. The range is
from 0 to 4095.
linecard slot Enter the keyword linecard then the linecard slot number.
port-set
number
Enter the keyword port-set then the linecard port-pipe
number.
Defaults none
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
8.3.19.0
Introduced on the S4820T.
Version 8.3.11.1 Introduced on the Z9000.
Version 8.3.7.0 Introduced on the S4810.
Version 8.3.1.0 Introduced on the E-Series.
Usage
Information
Deterministic ECMP sorts ECMPs in order even though RTM provides them in a
random order. However, the hash algorithm uses as a seed the lower 12 bits of the
chassis MAC, which yields a different hash result for every chassis. This behavior
means that for a given flow, even though the prefixes are sorted, two unrelated
chassis select different hops.
Equal Cost Multi-Path (ECMP)
645