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Link Aggregation Commands
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• All the ports in a trunk have to be treated as a whole when moved from/to,
added or deleted from a VLAN via the specified port-channel.
• STP, VLAN, and IGMP settings can only be made for the entire trunk via the
specified port-channel.
Dynamically Creating a Port Channel –
Ports assigned to a common port channel must meet the following criteria:
• Ports must have the same LACP system priority.
• Ports must have the same port admin key (Ethernet Interface).
• If the port channel admin key (lacp admin key - Port Channel) is not set when
a channel group is formed (i.e., it has the null value of 0), this key is set to the
same value as the port admin key (lacp admin key - Ethernet Interface) used
by the interfaces that joined the group.
• However, if the port channel admin key is set, then the port admin key must
be set to the same value for a port to be allowed to join a channel group.
• If a link goes down, LACP port priority is used to select the backup link.
channel-group
This command adds a port to a trunk. Use the no form to remove a port from a trunk.
Syntax
channel-group channel-id
no channel-group
channel-id - Trunk index (Range: 1-24)
Default Setting
The current port will be added to this trunk.
Command Mode
Interface Configuration (Ethernet)
Command Usage
• When configuring static trunks, the switches must comply with the Cisco
EtherChannel standard.
•Use no channel-group to remove a port group from a trunk.
• Use no interfaces port-channel to remove a trunk from the switch.
Example
The following example creates trunk 1 and then adds port 11:
Console(config)#interface port-channel 1
Console(config-if)#exit
Console(config)#interface ethernet 1/11
Console(config-if)#channel-group 1
Console(config-if)#