Administrator Guide

Version Description
9.9(0.0) Introduced on the C9010.
9.2(1.0) Introduced on the Z9500.
9.0.0.0 Introduced on the Z9000.
8.3.19.0 Introduced on the S4820T.
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 10–Gigabit
Ethernet, 40–Gigabit Ethernet, and port-channel configuration using the CONFIGURATION ECMP-
GROUP command mode.
hash-algorithm ecmp
Changes the hash algorithm used to distribute traffic flows across an ECMP.
C9000 Series
Syntax
hash-algorithm {ecmp {crc16 | crc16cc | crc32MSB | crc32LSB | crc–upper |
dest-ip | lsb | xor1 | xor2 | xor4 | xor8 | xor16} hg {crc16 | crc16cc
| crc32MSB | crc32LSB | xor1 | xor2 | xor4 | xor8 | xor16} {hg-seed seed-
value} lag {crc16 | crc16cc | crc32MSB | crc32LSB | xor1 | xor2 | xor4 |
xor8 | xor16} | seed seed-value} linecard slot-id | port-set port-pipe
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
ecmp crc16
| crc16cc |
crc32MSB |
crc32LSB | crc-
upper
| dest-ip |
lsb | xor1 | xor2
| xor4 | xor8 |
xor16
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
hg { crc16
| crc16cc |
crc32MSB |
crc32LSB | xor1 |
Enter the keyword hg 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
Equal Cost Multi-Path (ECMP) 647