Cisco Catalyst 4500 Series Configuration Guide

20-7
Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
OL-25340-01
Chapter 20 Configuring STP and MST
Default STP Configuration
For enabling information, see “Enabling Per-VLAN Rapid Spanning Tree” on page 20.
Default STP Configuration
Table 20-4 shows the default spanning tree configuration.
Configuring STP
The following sections describe how to configure spanning tree on VLANs:
• 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
Table 20-4 Spanning Tree Default Configuration Values
Feature Default Value
Enable state Spanning tree enabled for all VLANs
Bridge priority value 32,768
Spanning tree port priority value (configurable on a
per-interface basis—used on interfaces configured as
Layer 2 access ports)
128
Spanning tree port cost (configurable on a per-interface
basis—used on interfaces configured as Layer 2 access
ports)
• 10-Gigabit Ethernet: 2
• Gigabit Ethernet: 4
• Fast Ethernet: 19
Spanning tree VLAN port priority value (configurable on
a per-VLAN basis—used on interfaces configured as
Layer 2 trunk ports)
128
Spanning tree VLAN port cost (configurable on a
per-VLAN basis—used on interfaces configured as
Layer 2 trunk ports)
• 10-Gigabit Ethernet: 2
• Gigabit Ethernet: 4
• Fast Ethernet: 19
Hello time 2 sec
Forward delay time 15 sec
Maximum aging time 20 sec

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E