L
INK
A
GGREGATION
C
OMMANDS
-23
Command Usage
The ports on b oth ends of a n LACP trunk must be conf igured for f ull
duplex, either by forced mode or auto-negotiation.
• A trunk forme d 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 10-12. 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 1/10
Console(config-if)#lacp
Console(config-if)#exit
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)#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