Dell Force10 Z9000 - Page 610

ip-sa-mask value E-Series only: (OPTIONAL) Enter the keyword ip-sa-mask
followed by the ECMP/ LAG hash mask value. The range is 0 to FF.
The default is FF.
ip-da-mask E-Series only: (OPTIONAL) Enter the keywordip-da-mask followed
by the ECMP/LAG hash mask value. The range is 0 to FF. The default
is
FF.
Defaults 0 for hash-algorithm value on TeraScale and ExaScale. IPSA and IPDA mask value is FF for the
line card.
Command Modes CONFIGURATION
Command History
Version 8.3.11.1 Introduced on the Z9000.
Version 8.3.10.0 Introduced on the S4810.
Version 8.1.1.0 Introduced on the E-Series ExaScale.
Version 7.8.1.0 Added the nh-ecmp option.
Version 7.7.1.1 Added the nh-ecmp option.
Version 6.5.1.0 Added the line card option on TeraScale only.
Version 6.3.1.0 Added support for ECMP and LAG on TeraScale only.
Usage
Information
Set the default hash-algorithm method on ExaScale systems to ensure that CRC is not used for
LAG. 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
(Config)). Any other microcode returns an error message as follows:
• FTOS(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, FTOS 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
•
hash-algorithm linecard 2 ip-sa-mask 00 ip-da-mask aa
610