Cisco Catalyst 2950 Command Reference

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Catalyst 2950 and Catalyst 2955 Switch Command Reference
OL-10102-01
Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
lacp system-priority
lacp system-priority
Use the lacp system-priority global configuration command to set the system priority for Link
Aggregration Control Protocol (LACP). Use the no form of this command to return to the default setting.
lacp system-priority priority-value
no lacp system-priority
Syntax Description
Defaults The default priority value 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.
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 set the system priority for LACP:
Switch(config)# lacp system-priority 32764
You can verify your settings by entering the show lacp sys-id privileged EXEC command.
priority-value System priority for LACP. The range is from 1 to 65535.
Release Modification
12.1(12c)EA1 This command was introduced.

Cisco Catalyst 2950 Specifications

General

Forwarding Bandwidth	8.8 Gbps
Switching Capacity	13.6 Gbps
Forwarding Rate	6.6 Mpps
Weight	3.6 kg
RAM	16 MB
Flash Memory	8 MB
Operating Humidity	10% to 85% non-condensing
Uplink Ports	2 x 10/100/1000Base-T
Dimensions	4.4 cm x 44.5 cm x 24.2 cm
Remote Management Protocol	SNMP, Telnet, HTTP
Features	Quality of Service (QoS), VLAN support
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.1D, IEEE 802.1Q, IEEE 802.1p
Status Indicators	system
Operating Temperature	0 to 45°C
Ports	24 x 10/100 Ethernet ports
MAC Address Table Size	8, 192 entries
Power Supply	Internal 100-240V AC, 50-60Hz