Dell Z9000, Configuration Manual

Page: 335 / 968

Hash seed is used to compute the hash value. By default hash seed is chassis MAC 32 bits. we can also
change the hash seed by the following command.
CONFIGURATION mode
hash-algorithm seed {seed value}
• Change to another algorithm.
CONFIGURATION mode
hash-algorithm [ecmp{crc16|crc16cc|crc32LSB|crc32MSB|crc-upper|dest-ip|lsb|
xor1|xor2|xor4|xor8|xor16}]
Example of the
hash-algorithm
Command
Dell(conf)#hash-algorithm ecmp xor 26 lag crc 26 nh-ecmp checksum 26
Dell(conf)#
The
hash-algorithm
command is specific to ECMP group. The default ECMP hash configuration is crc-
lower . This command takes the lower 32 bits of the hash key to compute the egress port. Other options
for ECMP hash-algorithms are:
•
crc16
— uses 16 bit CRC16-bisync polynomial
•
crc16cc
— uses 16 bit CRC16 using CRC16-CCITT polynomial
•
crc32LSB
— uses LSB 16 bits of computed CRC32
•
crc32MSB
— uses MSB 16 bits of computed CRC32(default)
•
crc-upper
— uses the upper 32 bits of the hash key to compute the egress port.
•
dest-ip
— uses destination IP address as part of the hash key.
•
lsb
—uses always return the LSB of the key as the hash
•
xor1
— uses Upper 8 bits of CRC16-BISYNC and lower 8 bits of xor1
•
xor2
— Upper 8 bits of CRC16-BISYNC and lower 8 bits of xor2
•
xor4
—Upper 8 bits of CRC16-BISYNC and lower 8 bits of xor4
•
xor8
— Upper 8 bits of CRC16-BISYNC and lower 8 bits of xor8
•
xor16
— uses 16 bit XOR.
Bulk Configuration
Bulk configuration allows you to determine if interfaces are present for physical interfaces or configured
for logical interfaces.
Interface Range
An interface range is a set of interfaces to which other commands may be applied and may be created if
there is at least one valid interface within the range.
Bulk configuration excludes from configuration any non-existing interfaces from an interface range. A
default VLAN may be configured only if the interface range being configured consists of only VLAN ports.
The
interface range
command allows you to create an interface range allowing other commands to
be applied to that range of interfaces.
Interfaces
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