Lacp Auto; Lacp Off - Dell PowerEdge M420 Reference Manual

lacp auto

Use the lacp auto command to set the LACP (Link Aggregation) mode to
dynamic for that Aggregator Group. This means that when more than one
uplink port is in the Group, those uplink ports will be enabled automatically
with dynamic LACP .
Syntax
lacp auto
Default Configuration
This command has no default configuration.
Command Mode
Port Aggregator mode
User Guidelines
This command has no user guidelines.
Example
console(config)#port-aggregator group 2
console(config-aggregator-2)#lacp auto
console(config-aggregator-2)#

lacp off

Use the lacp off command to set the LACP (Link Aggregation) mode to off
for that Aggregator Group. This means that when more than one uplink port
is in the Group, all the uplinks are shut down except the lowest numbered
one.
Syntax
lacp off
581
Port Channel Commands