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• The ports on both ends of an LACP trunk must be configured for full
duplex, and 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 eight 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 Trunk 1 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: 100TX
Mac address: 00-12-CF-12-34-72
Configuration:
Name:
Port admin: Up
Speed-duplex: Auto
Capabilities: 10half, 10full, 100half, 100full
Flow control status: Disabled
Port security: Disabled
Max MAC count: 0
Current status:
Created by: LACP
Link status: Up
Operation speed-duplex: 100full
Flow control type: None
Member Ports: Eth1/11, Eth1/12, Eth1/13,
Console#
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