Name: Cisco 2950 - Catalyst Switch
Brand: Cisco
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14-11

Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide

78-11380-10

Chapter 14 Configuring STP

Configuring Spanning-Tree Features

These sections describe how to configure spanning-tree features:

• Default Spanning-Tree Configuration, page 14-11

• Spanning-Tree Configuration Guidelines, page 14-12

• Changing the Spanning-Tree Mode, page 14-13 (required)

• Disabling Spanning Tree, page 14-14 (optional)

• Configuring the Root Switch, page 14-14 (optional)

• Configuring a Secondary Root Switch, page 14-16 (optional)

• Configuring the Port Priority, page 14-17 (optional)

• Configuring the Path Cost, page 14-19 (optional)

• Configuring the Switch Priority of a VLAN, page 14-20 (optional)

• Configuring Spanning-Tree Timers, page 14-21 (optional)

Default Spanning-Tree Configuration

Table 14-3 shows the default spanning-tree configuration.

Table 14-3 Default Spanning-Tree Configuration

Feature Default Setting

Enable state Enabled on VLAN 1.

For more information, see the “Supported

Spanning-Tree Instances” section on

page 14-9.

Spanning-tree mode PVST+. (Rapid PVST+ and MSTP are

disabled.)

Switch priority 32768.

Spanning-tree port priority (configurable on a per-interface basis) 128.

Spanning-tree port cost (configurable on a per-interface basis) 1000 Mbps: 4.

100 Mbps: 19.

10 Mbps: 100.

Spanning-tree VLAN port priority (configurable on a per-VLAN basis) 128.

Spanning-tree VLAN port cost (configurable on a per-VLAN basis) 1000 Mbps: 4.

100 Mbps: 19.

10 Mbps: 100.

Spanning-tree timers Hello time: 2 seconds.

Forward-delay time: 15 seconds.

Maximum-aging time: 20 seconds.

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Cisco 2950 - Catalyst Switch Specifications

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