Users Guide

linecard number
(OPTIONAL) : Enter the keyword linecard then the linecard slot
number.
port-set number
(OPTIONAL) Enter the keyword port-set then the port-set slot
number.
Defaults 0 for hash-algorithm value on TeraScale and ExaScale IPSA and IPDA mask value is FF
for a line card.
Command Modes CONFIGURATION
Supported Modes Full–Switch
Command History
Version Description
9.9(0.0) Introduced on the FN IOM. Added flow-based-hashing support
for hashing on ECMP.
9.2(0.0) Introduced on the MXL 10/40GbE Switch IO Module.
Usage Information To ensure that CRC is not used for LAG, set the default hash-algorithm method on
ExaScale systems. For example,hash-algorithm ecmp xor lag checksum nh-
ecmp checksum.
To achieve the functionality of hash-align on the ExaScale platform, do not use CRC as
a hash-algorithm method.
The hash value calculated with the hash-algorithm command is unique to the entire
chassis. The hash algorithm command with the line card option changes the hash for a
particular line card by applying the mask specified in the IPSA and IPDA fields.
The line card option is applicable with the lag-hash-align microcode only (refer to
CAM Profile Commands). 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, the Dell Networking OS maintains bi-
directionality with masks set to XX 00 for line card 1 and 00 XX for line card 2 (ip-
sa-mask
and ip-da-mask). The mask value must be the same for both line cards
when using multiple line cards as ingress (where XX is any value from 00 to FF for
both line cards). 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
Equal Cost Multi-Path (ECMP) 556