Hash-Algorithm - Dell Force10 S4810P Reference Manual

Usage Using CONFIGURATION mode, create an ECMP group ID. You can then assign interfaces to the
Information 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.
E-Series, Z-Series, S4810
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
Parameters
algorithm-number
ecmp
crc16cc |
crc32MSB |
crc32LSB | crc-
upper | dest-ip |
lsb | xor1 | xor2 |
xor4 | xor8 | xor16
672
number command.
Enter the algorithm number. The range is 0 to 47.
crc16 | TeraScale and ExaScale Only: Enter the keyword ecmp followed by
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
• lsb: Returns the LSB of the key as the hash
• xor1: Use CRC16_BISYNC_AND_XOR1 - Upper 8 bits of
CRC16-BISYNC and lower 8 bits of xor1
• xor2: Use CRC16_BISYNC_AND_XOR2 - Upper 8 bits of
CRC16-BISYNC and lower 8 bits of xor2