Users Guide
Defaults IPSA and IPDA mask value is FF for the stack-unit.
Command Modes CONFIGURATION
Command History
This guide is platform-specic. For command information about other platforms, see the relevant Dell Networking
OS Command Line Reference Guide.
Version Description
9.9(0.0) Added flow-based-hashing support for hashing on ECMP for S4820T, S6000,
S4048 and Z9500.
9.8(1.0) Introduced on the Z9100–ON.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000-ON.
9.2(1.0) Introduced on the Z9500.
9.0.2.0 Introduced on the S6000.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.10.0 Introduced on the S4810.
8.1.1.0 Introduced on the E-Series.
7.8.1.0 Added the nh-ecmp option.
7.7.1.1 Added the nh-ecmp option.
Usage Information To ensure that CRC is not used for LAG, set the default hash-algorithm method on E-Series systems. For
example,hash-algorithm ecmp xor lag checksum nh-ecmp checksum.
The hash value calculated with the hash-algorithm command is unique to the entire unit. The hash algorithm
command with the stack-unit option changes the hash for a particular stack-unit by applying the mask specied in
the IPSA and IPDA elds.
The stack-unit option is applicable with the lag-hash-align microcode only. Any other microcode returns an error
message as follows:
• Dell(conf)#hash-algorithm linecard 5 ip-sa-mask ff ip-da-mask ff
• % Error: This command is not supported in the current microcode configuration
In addition, the linecard number ip-sa-mask value ip-da-mask value option has the following
behavior to maintain bi-directionality:
• When hashing is done on both IPSA and IPDA, the ip-sa-mask and ip-da-mask values must be equal.
(Single Linecard).
• When hashing is done only on IPSA or IPDA, Dell Networking OS maintains bi-directionality with masks set to
XX 00 for stack-unit 1 and 00 XX for stack-unit 2 (ip-sa-mask and ip-da-mask). The mask value must be
the same for both stack-units when using multiple stack-units as ingress (where XX is any value from 00 to FF
for both stack-units). For example, assume that trac is owing between linecard 1 and linecard 2:
• hash-algorithm linecard 1 ip-sa-mask aa ip-da-mask 00
• hash-algorithm linecard 2 ip-sa-mask 00 ip-da-mask aa
The dierent 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
Equal Cost Multi-Path (ECMP)
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