Cisco Catalyst 250 Series Command Reference

lacp system-priority
To configure the system priority for the Link Aggregation Control Protocol (LACP), use the lacp
system-priority command in global configuration mode on the switch. To return to the default setting, use
the no form of this command.
lacp system-priority priority
no lacp system-priority
Syntax Description
System priority for LACP. The range is 1 to 65535.
priority
Command Default
The default is 32768.
Command Modes
Global configuration
Command History
ModificationRelease
This command was introduced.Cisco IOS 15.0(2)EX
Usage Guidelines
The lacp system-priority command determines which switch in an LACP link controls port priorities.
An LACP channel group can have up to 16 Ethernet ports of the same type. Up to eight ports can be active,
and up to eight ports can be in standby mode. When there are more than eight ports in an LACP channel group,
the switch on the controlling end of the link uses port priorities to determine which ports are bundled into the
channel and which ports are put in hot-standby mode. Port priorities on the other switch (the noncontrolling
end of the link) are ignored.
In priority comparisons, numerically lower values have a higher priority. Therefore, the system with the
numerically lower value (higher priority value) for LACP system priority becomes the controlling system. If
both switches have the same LACP system priority (for example, they are both configured with the default
setting of 32768), the LACP system ID (the switch MAC address) determines which switch is in control.
The lacp system-priority command applies to all LACP EtherChannels on the switch.
Use the show etherchannel summary privileged EXEC command to see which ports are in the hot-standby
mode (denoted with an H port-state flag in the output display).
Examples
This example shows how to set the LACP system priority:
Switch(config)# lacp system-priority 20000
You can verify your settings by entering the show lacp sys-id privileged EXEC command.
Catalyst 2960-X Switch Layer 2 Command Reference, Cisco IOS Release 15.0(2)EX
OL-29043 -01 45
Layer 2 Commands
lacp system-priority

Cisco Catalyst 250 Series Specifications

General

Brand	Cisco
Model	Catalyst 250 Series
Category	Switch
Language	English