Default Stp Configuration - Cisco Catalyst 4500 Series Configuration Manual

Chapter 20 Configuring STP and MST
For enabling information, see "Enabling Per-VLAN Rapid Spanning Tree" on page 20.

Default STP Configuration

Table 20-4
Table 20-4
Feature
Enable state
Bridge priority value
Spanning tree port priority value (configurable on a
per-interface basis—used on interfaces configured as
Layer 2 access ports)
Spanning tree port cost (configurable on a per-interface
basis—used on interfaces configured as Layer 2 access
ports)
Spanning tree VLAN port priority value (configurable on
a per-VLAN basis—used on interfaces configured as
Layer 2 trunk ports)
Spanning tree VLAN port cost (configurable on a
per-VLAN basis—used on interfaces configured as
Layer 2 trunk ports)
Hello time
Forward delay time
Maximum aging time
Configuring STP
The following sections describe how to configure spanning tree on VLANs:
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•
•
•
•
•
•
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•
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OL-25340-01
shows the default spanning tree configuration.
Spanning Tree Default Configuration Values
Enabling STP, page 20-8
Enabling the Extended System ID, page 20-9
Configuring the Root Bridge, page 20-10
Configuring a Secondary Root Switch, page 20-12
Configuring STP Port Priority, page 20-13
Configuring STP Port Cost, page 20-15
Configuring the Bridge Priority of a VLAN, page 20-17
Configuring the Hello Time, page 20-17
Configuring the Maximum Aging Time for a VLAN, page 20-18
Configuring the Forward-Delay Time for a VLAN, page 20-19
Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
Default STP Configuration
Default Value
Spanning tree enabled for all VLANs
32,768
128
• 10-Gigabit Ethernet: 2
• Gigabit Ethernet: 4
• Fast Ethernet: 19
128
• 10-Gigabit Ethernet: 2
• Gigabit Ethernet: 4
• Fast Ethernet: 19
2 sec
15 sec
20 sec
20-7