Administrator Guide
Version Description
9.8(1.0) Introduced on the Z9100–ON.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000-ON.
9.2(1.0) Introduced on the Z9500.
9.0.2.0 Introduced on the S6000.
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 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 and ECMP. The ECMP and LAG options are supported
on the S-Series and Z-Series.
Syntax
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.
Parameters
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
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
crc16 |crc16cc |crc32MSB |crc32LSB |xor1 |xor2 |xor4 |xor8 | xor16
• 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
582 Equal Cost Multi-Path (ECMP)