Concept Guide

Dell EMC Networking OS allows you to modify the hashing algorithms used for ows and for fragments. The load-balance and hash-
algorithm commands are available for modifying the distribution algorithms.
Changing the Hash Algorithm
The load-balance command selects the hash criteria applied to port channels.
If you do not obtain even distribution with the load-balance command, you can use the hash-algorithm command to select the
hash scheme for LAG, ECMP and NH-ECMP. You can rotate or shift the 12–bit Lag Hash until the desired hash is achieved.
To change to another algorithm, use the second command.
• Change the default (0) to another algorithm and apply it to ECMP, LAG hashing, or a particular line card.
CONFIGURATION mode
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 seed-value | seedseed-value
For more information about algorithm choices, refer to the command details in the IP Routing chapter of the Dell EMC Networking OS
Command Reference Guide.
• 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
The hash-algorithm command is specic to ECMP group. The default ECMP hash conguration 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:
Bulk Conguration
Bulk conguration allows you to determine if interfaces are present for physical interfaces or congured 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 conguration excludes from conguration any non-existing interfaces from an interface range. A default VLAN may be congured only
if the interface range being congured 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.
The interface range prompt oers the interface (with slot and port information) for valid interfaces. The maximum size of an interface
range prompt is 32. If the prompt size exceeds this maximum, it displays (...) at the end of the output.
NOTE
: Non-existing interfaces are excluded from the interface range prompt.
NOTE: When creating an interface range, interfaces appear in the order they were entered and are not sorted.
436 Interfaces