Users Guide

Version Description
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 port-channel conguration
using the CONFIGURATION ECMP-GROUP command mode.
hash-algorithm
Changes the hash algorithm used to distribute trac ows across a Port Channel. The ECMP and LAG options are supported on the
Z-Series.
S4820T
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] stack—unit 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 stack-unit, 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
Equal Cost Multi-Path (ECMP)
571