Version
Description
8.3.11.4
Introduced on the Z9000.
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
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
9.2(1.0)
Introduced on the Z9500.
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.
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)
747
