Reference Guide
Version 9.0.0.0 Introduced on the Z9000.
Version 8.3.19.0 Introduced on the S4820T.
Version 8.3.10.0 Introduced on the S4810.
Usage
Information
Using CONFIGURATION mode, create an ECMP group ID. You can then assign interfaces to the
ECMP group using CONFIGURATION ECMP-GROUP mode. You can also enable on the port-
channel configuration using the CONFIGURATION ECMP-GROUP command mode.
hash-algorithm
Changes the hash algorithm used to distribute traffic flows across a Port Channel. The ECMP and LAG options are
supported on the Z-Series. The ECMP, LAG, and line card options are supported only on the E-Series TeraScale and
ExaScale chassis.
Z9000
Syntax
hash-algorithm {algorithm-number | {ecmp {crc16 | crc16cc |
crc32MSB | crc32LSB | crc-upper | dest-ip | lsb | xor1 | xor2 |
xor4 | xor8 | xor16} [number] hg {crc16 | crc16cc | crc32MSB |
crc32LSB | xor1 | xor2 | xor4 | xor8 | xor16} stack-unit stack-
unit-number | port-set port-pipe | hg-seed seed-value stack-
unit | lag {checksum | crc | xor} [number] nh-ecmp {checksum |
crc | xor}[
number] linecard number ip-sa-mask value ip-da-mask
value | seed seed-value }
To return to the default hash algorithm, use the no hash-algorithm command.
To return to the default ECMP hash algorithm, use the no hash-algorithm ecmp
algorithm-value
command.
To remove the hash algorithm on a particular line card, use the no hash-algorithm
linecard
number
command.
Parameters
algorithm-number
Enter the algorithm number. The range is from 0 to 47.
ecmp
crc16
|
crc16cc
|
crc32MSB
|
crc32LSB
|
crc-
upper
|
dest-ip
|
lsb
|
xor1
|
xor2
|
xor4
|
xor8
|
xor16
TeraScale and ExaScale Only: Enter the keyword ecmp then one of
the following options:
• crc16: Use CRC16_BISYNC — 16 bit CRC16-bisync
polynomial (default)
• crc16cc: Use CRC16_CCITT — 16 bit CRC16 using CRC16-
CCITT polynomial
• crc32MSB: Use CRC32_UPPER — MSB 16 bits of computed
CRC32
• crc32LSB: Use CRC32_LOWER — LSB 16 bits of computed
CRC32
• crc-upper: Uses the upper 32 bits of the key for the hash
computation
• dest-ip: Uses the destination IP for ECMP hashing
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