no untagged port-channel id number
• Identify which port channels are members of VLANs.
EXEC Privilege mode
show vlan
Assigning an IP Address to a Port Channel
You can assign an IP address to a port channel and use port channels in Layer 3 routing protocols.
To assign an IP address, use the following command.
• Configure an IP address and mask on the interface.
INTERFACE mode
ip address ip-address mask [secondary]
–ip-address mask: enter an address in dotted-decimal format (A.B.C.D). The mask must be in
slash format (/24).
–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.
416 Interfaces