Cisco Catalyst 4500 Series Administration Guide

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Software Configuration Guide—Release IOS XE 3.5.0SG and IOS 15.2(2)SG
OL-27597-01
Chapter 22 Configuring STP and MST
Configuring STP
Note The show spanning-tree command displays only information for ports with an active link (green light
is on). If there is no port with an active link, you can issue a show running-config command to confirm
the configuration.
Configuring the Bridge Priority of a VLAN
Note Exercise care when configuring the bridge priority of a VLAN. In most cases, we recommend that you
enter the spanning-tree vlan vlan_ID root primary and the spanning-tree vlan vlan_ID root
secondary commands to modify the bridge priority.
To configure the spanning tree bridge priority of a VLAN, perform this task:
This example shows how to configure the bridge priority of VLAN 200 to 33,792:
Switch# configure terminal
Switch(config)# spanning-tree vlan 200 priority 33792
Switch(config)# end
Switch#
This example shows how to verify the configuration:
Switch# show spanning-tree vlan 200 bridge brief
Hello Max Fwd
Vlan Bridge ID Time Age Delay Protocol
---------------- -------------------- ---- ---- ----- --------
VLAN200 33792 0050.3e8d.64c8 2 20 15 ieee
Switch#
Configuring the Hello Time
Note Exercise care when configuring the hello time. In most cases, we recommend that you use the
spanning-tree vlan vlan_ID root primary and the spanning-tree vlan vlan_ID root secondary
commands to modify the hello time.
Command Purpose
Step 1
Switch(config)# [no] spanning-tree vlan vlan_ID
priority bridge_priority
Configures the bridge priority of a VLAN. The
bridge_priority value can be from 1 to 65,534.
Use the no keyword to restore the defaults.
Step 2
Switch(config)# end
Exits configuration mode.
Step 3
Switch# show spanning-tree vlan vlan_ID bridge
[brief]
Verifies the configuration.

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