Hash-Algorithm Seed - Dell Z9500 Command Reference Manual

Version
8.3.11.4

hash-algorithm seed

Select the seed value for the ECMP, LAG, and NH hashing algorithm.
Z9500
Syntax
hash-algorithm seed value [linecard slot] [port-set number]
Parameters
seed value
linecard slot
port-set
number
Defaults none
Command CONFIGURATION
Modes
Command
This guide is platform-specific. For command information about other platforms,
History
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
9.2(1.0)
8.3.19.0
8.3.11.1
8.3.7.0
8.3.1.0
Usage Deterministic ECMP sorts ECMPs in order even though RTM provides them in a
Information 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.
The system provides a CLI-based solution for modifying the hash seed to ensure
that on each configured system, the ECMP selection is same. When configured, the
same seed is set for ECMP, LAG, and NH, and is used for incoming traffic only.
Equal Cost Multi-Path (ECMP)
Description
Introduced on the Z9000.
Enter the keyword seed then the seed value. The range is
from 0 to 4095.
Enter the keyword linecard then the linecard slot number.
Enter the keyword port-set then the linecard port-pipe
number.
Description
Introduced on the Z9500.
Introduced on the S4820T.
Introduced on the Z9000.
Introduced on the S4810.
Introduced on the E-Series.
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