White Papers

[number] lag {checksum | crc | xor} [number] nh-ecmp {checksum | crc |
xor}[number] linecard number ip-sa-mask value ip-da-mask value | seed seed-
value }hash-algorithm {ecmp {crc16 | crc16cc | crc32MSB | crc32LSB | crc-
upper | dest-ip | flow-based-hashing {crc16|crc16cc|crc32MSB|crc32LSB|xor1|
xor2|xor4|xor8|xor16}|lsb | xor1 | xor2 | xor4 | xor8 | xor16}[[hg {crc16
| crc16cc | crc32MSB | crc32LSB | xor1 | xor2 | xor4 | xor8 | xor16}]|
[lag {crc16 | crc16cc | crc32MSB | crc32LSB | xor1 | xor2 | xor4 | xor8 |
xor16 }][stack-unit|linecard number | port-set number] | [hg—seed value] |
[seedvalue]
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 stack-unit / 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
● 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
● xor4: Use CRC16_BISYNC_AND_XOR4 — Upper 8 bits of CRC16-BISYNC and
lower 8 bits of xor4
● xor8: Use CRC16_BISYNC_AND_XOR8 — Upper 8 bits of CRC16-BISYNC and
lower 8 bits of xor8
● xor16: Use CR16 — 16 bit XOR
lag hash
algorithm value
Enter the keyword lag then the LAG hash algorithm value. The range is from 0 to
47.
nh-ecmp hash
algorithm value
(OPTIONAL) Enter the keyword nh-ecmp then the ECMP hash algorithm value.
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.
ecmp crc16
| crc16cc |
crc32MSB |
crc32LSB |
crc-upper |
dest-ip | flow-
based-hashing
| crc16 | crc16cc |
crc32MSB |
crc32LSB | xor1 |
xor2 | xor4 | xor8
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
● flow-based-hashing: Enter the keywords flow-based-hashing
followed by the algorithm
420 Equal Cost Multi-Path (ECMP)