Owners Manual

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 Description
9.7(0.0) Introduced on the S6000-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.
8.3.1.0 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)
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