Lacp System-Priority - Cisco Catalyst 3550 Command Reference Manual
Multilayer switch
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lacp system-priority
lacp system-priority
Use the lacp system-priority global configuration command to set the system priority for Link
Aggregation Control Protocol (LACP). Use the no form of this command to return to the default setting.
Syntax Description
priority-value
Defaults
The default priority value is 32768.
Command Modes
Global configuration
Command History
Release
12.1(12c)EA1
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 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).
For more information about configuring LACP on physical interfaces, see the "Configuring
EtherChannels" chapter in the software configuration guide for this release.
Examples
This example shows how to set the system priority for LACP:
Switch(config)# lacp system-priority 32764
You can verify your settings by entering the show lacp internal privileged EXEC command.
Catalyst 3550 Multilayer Switch Command Reference
2-208
lacp system-priority priority-value
no lacp system-priority
System priority for LACP. The range is 1 to 65535.
Modification
This command was introduced.
Chapter 2
Catalyst 3550 Switch Cisco IOS Commands
OL-8566-02
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