Users Guide

– secondary: the IP address is the interface’s backup IP address. You can configure up to eight
secondary IP addresses.
Deleting or Disabling a Port Channel
To delete or disable a port channel, use the following commands.
• Delete a port channel.
CONFIGURATION mode
no interface portchannel channel-number
• Disable a port channel.
shutdown
When you disable a port channel, all interfaces within the port channel are operationally down also.
Load Balancing Through Port Channels
The system uses hash algorithms for distributing traffic evenly over channel members in a port channel
(LAG).
The hash algorithm distributes traffic among electronic commerce messaging protocol (ECMP) paths and
LAG members. The distribution is based on a flow, except for packet-based hashing. A flow is identified
by the hash and is assigned to one link. In packet-based hashing, a single flow can be distributed on the
LAG and uses one link.
Packet based hashing is used to load balance traffic across a port-channel based on the IP Identifier field
within the packet. Load balancing uses source and destination packet information to get the greatest
advantage of resources by distributing traffic over multiple paths when transferring data to a destination.
The system allows you to modify the hashing algorithms used for flows 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 | 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.
Interfaces
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