Configuring Spanning-Tree Features - Cisco Catalyst 3550 series Software Configuration Manual

Chapter 16 Configuring STP
To support VLAN-bridge spanning tree, some of the spanning-tree timers are increased. To use the
fallback bridging feature, you must have the enhanced multilayer software image installed on your
switch. For more information, see

Configuring Spanning-Tree Features

These sections describe how to configure spanning-tree features:
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Default Spanning-Tree Configuration
Table 16-3
Table 16-3 Default Spanning-Tree Configuration
Feature
Enable state
Spanning-tree mode
Switch priority
Spanning-tree port priority (configurable on a per-interface basis)
Spanning-tree port cost (configurable on a per-interface basis)
Spanning-tree VLAN port priority (configurable on a per-VLAN basis)
78-11194-09
Default Spanning-Tree Configuration, page 16-11
Spanning-Tree Configuration Guidelines, page 16-12
Changing the Spanning-Tree Mode, page 16-13
Disabling Spanning Tree, page 16-14
Configuring the Root Switch, page 16-14
Configuring a Secondary Root Switch, page 16-16
Configuring the Port Priority, page 16-17
Configuring the Path Cost, page 16-18
Configuring the Switch Priority of a VLAN, page 16-20
Configuring Spanning-Tree Timers, page 16-20
shows the default spanning-tree configuration.
Chapter 36, "Configuring Fallback Bridging."
(required)
(optional)
(optional)
(optional)
(optional)
(optional)
(optional)
Default Setting
Enabled on VLAN 1.
For more information, see the
Spanning-Tree Instances" section on
page
PVST+. (Rapid PVST+ and MSTP are
disabled.)
32768.
128.
1000 Mbps: 4.
100 Mbps: 19.
10 Mbps: 100.
128.
Catalyst 3550 Multilayer Switch Software Configuration Guide
Configuring Spanning-Tree Features
(optional)
16-9.
"Supported
16-11