Users Guide
– secondary: the IP address is the interface’s backup IP address. You can congure 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 trac evenly over channel members in a port channel (LAG).
The hash algorithm distributes trac among electronic commerce messaging protocol (ECMP) paths and LAG members. The distribution is
based on a ow, except for packet-based hashing. A ow is identied by the hash and is assigned to one link. In packet-based hashing, a
single ow can be distributed on the LAG and uses one link.
Packet based hashing is used to load balance trac across a port-channel based on the IP Identier eld within the packet. Load balancing
uses source and destination packet information to get the greatest advantage of resources by distributing trac over multiple paths when
transferring data to a destination.
The system 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 | 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}
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Interfaces