linecard
number
(OPTIONAL) Enter the keyword
linecard
then the linecard
slot number.
ip-sa-mask
value
(OPTIONAL) Enter the keywords
ip-sa-mask
then the
ECMP/LAG hash mask value. The range is from 0 to FF. The
default is
FF
.
ip-da-mask
value
(OPTIONAL) Enter the keywords
ip-da-mask
then the
ECMP/LAG hash mask value. The range is from 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 a line card.
Command
Modes
CONFIGURATION
Command
History
Version 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)
505
