Cisco Catalyst 4500 Series Command Reference Guide

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Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
debug spanning-tree
debug spanning-tree
To debug the spanning tree activities, use the debug spanning-tree command. To disable the debugging
output, use the no form of this command.
debug spanning-tree {all | backbonefast | bpdu | bpdu-opt | etherchannel | config | events |
exceptions | general | ha | mstp | pvst+ | root | snmp | switch | synchronization | uplinkfast}
no debug spanning-tree {all | bpdu | bpdu-opt | etherchannel | config | events | exceptions |
general | mst | pvst+ | root | snmp}
Syntax Description
Defaults This command has no default settings.
Command Modes Privileged EXEC mode
Command History
Examples This example shows how to debug the spanning-tree PVST+:
Switch# debug spanning-tree pvst+
Spanning Tree PVST+ debugging is on
Switch#
all Displays all the spanning tree debugging messages.
backbonefast Debugs the BackboneFast events.
bpdu Debugs the spanningtree BPDU.
bpdu-opt Debugs the optimized BPDU handling.
etherchannel Debugs the spanning tree EtherChannel support.
config Debugs the spanning tree configuration changes.
events Debugs the TCAM events.
exceptions Debugs the spanning tree exceptions.
general Debugs the general spanning tree activity.
ha Debugs the HA events.
mstp Debugs the multiple spanning tree events.
pvst+ Debugs the PVST+ events.
root Debugs the spanning tree root events.
snmp Debugs the spanning tree SNMP events.
switch Debugs the switch debug events.
synchronization Debugs the STP state synchronization events.
uplinkfast Debugs the UplinkFast events.
Release Modification
12.1(8a)EW Support for this command was introduced on the Catalyst 4500 series switch.

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