Link Aggregation Commands
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lacp
This command enables 802.3ad Link Aggregation Control Protocol (LACP) for the
current interface. Use the no form to disable it.
Syntax
[no] lacp
Default Setting
Disabled
Command Mode
Interface Configuration (Ethernet)
Command Usage
• The ports on both ends of an LACP trunk must be configured for full duplex,
either by forced mode or auto-negotiation.
• A trunk formed with another switch using LACP will automatically be assigned
the next available port-channel ID.
• If the target switch has also enabled LACP on the connected ports, the trunk
will be activated automatically.
• If more than four ports attached to the same target switch have LACP
enabled, the additional ports will be placed in standby mode, and will only be
enabled if one of the active links fails.
Example
The following shows LACP enabled on ports 11-13. Because LACP has also been
enabled on the ports at the other end of the links, the show interfaces status
port-channel 1 command shows that Trunk1 has been established.
Console(config)#interface ethernet 1/11
Console(config-if)#lacp
Console(config-if)#exit
Console(config)#interface ethernet 1/12
Console(config-if)#lacp
Console(config-if)#exit
Console(config)#interface ethernet 1/13
Console(config-if)#lacp
Console(config-if)#exit
Console(config)#exit
Console#show interfaces status port-channel 1
Information of Trunk 1
Basic information:
Port type: 1000T
Mac address: 00-00-e8-00-00-0b
Configuration:
Name:
Port admin status: Up
Speed-duplex: Auto
Capabilities: 10half, 10full, 100half, 100full, 1000full,
Flow control status: Disabled
Port security: Disabled
Max MAC count: 0