Cisco Catalyst 2950 Command Reference

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Catalyst 2950 and Catalyst 2955 Switch Command Reference
0L-10102-01
Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
spanning-tree mst port-priority
spanning-tree mst port-priority
Use the spanning-tree mst port-priority interface configuration command to configure an interface
priority. If a loop occurs, the Multiple Spanning Tree Protocol (MSTP) can determine which interface
to put in the forwarding state. Use the no form of this command to return to the default setting.
spanning-tree mst instance-id port-priority priority
no spanning-tree mst instance-id port-priority
Syntax Description
Defaults The default is 128.
Command Modes Interface configuration
Command History
Usage Guidelines You can assign higher priority values (lower numerical values) to interfaces that you want selected first
and lower priority values (higher numerical values) that you want selected last. If all interfaces have the
same priority value, the MST puts the interface with the lowest interface number in the forwarding state
and blocks other interfaces.
Examples This example shows how to increase the likelihood that the interface associated with spanning-tree
instance 20 is placed into the forwarding state if a loop occurs:
Switch(config)# interface fastethernet0/2
Switch(config-if)# spanning-tree mst 20 port-priority 0
You can verify your settings by entering the show spanning-tree mst interface interface-id privileged
EXEC command.
instance-id Range of spanning-tree instances. You can specify a single instance, a range of
instances separated by a hyphen, or a series of instances separated by a comma. The
range is 0 to 15.
priority The range is 0 to 240 in increments of 16 (0, 16, 32, 48, 64, 80, 96, 112, 128, 144,
160, 176, 192, 208, 224, and 240). All other values are rejected. The lower the
number, the higher the priority.
Release Modification
12.1(9)EA1 This command was introduced.
12.1(13)EA1 The values for the instance-id and the priority variables were changed.
12.1(20)EA2 This command was added to the standard software image (SI).

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