Lacp System-Priority - Cisco ME 3400 Command Reference Manual

Ethernet access switch

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lacp system-priority

Use the lacp system-priority global configuration command to configure the system priority for the

Link Aggregation Control Protocol (LACP). Use the no form of this command to return to the default

LACP is available only on network node interfaces (NNIs) and enhanced network interfaces (ENIs).

Syntax Description

The default is 32768.

Command Modes

Global configuration

Command History

Usage Guidelines

The lacp system-priority command determines which switch in an LACP link controls port priorities.

Although this is a global configuration command, the priority only takes effect on EtherChannels that

have physical ports that are already configured for LACP.

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 switch with the

numerically lower system value (higher priority value) for LACP system priority becomes the

controlling switch. 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.

hot-standby mode (denoted with an H port-state flag).

For more information about configuring LACP on physical ports, see the "Configuring EtherChannels"

chapter in the software configuration guide for this release.

Cisco ME 3400 Ethernet Access Switch Command Reference

lacp system-priority priority

no lacp system-priority

System priority for LACP. The range is 1 to 65535.

Modification

This command was introduced.

show etherchannel

summary privileged EXEC command to see which ports are in the

Cisco ME 3400 Ethernet Access Switch Cisco IOS Commands