Users Guide
Version Description
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 specified in the IPSA and IPDA fields.
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 traffic is flowing 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 different 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 does not provide a satisfactory
distribution of traffic, use the hash-algorithm command to designate another
algorithm.
Equal Cost Multi-Path (ECMP) 663