Deployment Guide

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 |
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]]
For more information about algorithm choices, refer to the command details in the IP Routing chapter of the Dell Networking
OS Command Reference Guide.
● Change to another algorithm.
CONFIGURATION mode
hash-algorithm ecmp {crc-upper} | {dest-ip} | {lsb}
Dell(conf)#hash-algorithm ecmp xor1 lag crc16
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:
● 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 — always uses the least significant bit of the hash key to compute the egress port.
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.
The interface range prompt offers 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. In the following example, 10 Gigabit 3/0 and
VLAN 1000 do not exist.
NOTE: When creating an interface range, interfaces appear in the order they were entered and are not sorted.
The show range command is available under Interface Range mode. This command allows you to display all interfaces that
have been validated under the interface range context.
Interfaces
429