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hash-algorithm
Changes the hash algorithm used to distribute traffic flows across a Port Channel.
Syntax
hash-algorithm {algorithm-number | {ecmp {crc16 | crc16cc |
crc32MSB | crc32LSB | crc-upper | dest-ip | lsb | xor1 | xor2 |
xor4 | xor8 | xor16} [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 }
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
ecmp {crc16 |
crc16cc |
crc32MSB |
crc32LSB | crc-
upper | dest-ip
| lsb | xor1 |
xor2 | xor4 |
xor8 | xor16}
lag hash
algorithm value
nh-ecmp hash
algorithm value
504
Enter the algorithm number. The range is from 0 to 47.
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
Enter the keyword lag then the LAG hash algorithm value.
The range is from 0 to 47.
(OPTIONAL) Enter the keyword nh-ecmp then the ECMP
hash algorithm value.
Equal Cost Multi-Path (ECMP)
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