Cisco NM-8B-U - HW ROUTERS L-M User Manual page 168

debug spanning-tree
debug spanning-tree
To debug spanning-tree activities, use the debug spanning-tree command in privileged EXEC mode. To
disable debugging output, use the no form of this command.
Syntax Description
all
backbonefast
bpdu
bpdu-opt
config
etherchannel
events
exceptions
general
pvst+
root
snmp
uplinkfast
Defaults
Debugging is disabled.
Command Modes
Privileged EXEC
Command History Release
12.1(6)EA2
12.2(15)ZJ
Usage Guidelines
The undebug spanning-tree command is the same as the no debug spanning-tree command.
Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ
168
16- and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series
debug spanning-tree {all | backbonefast | bpdu | bpdu-opt | config | etherchannel | events |
exceptions | general | pvst+ | root | snmp | uplinkfast}
no debug spanning-tree {all | backbonefast | bpdu | bpdu-opt | config | etherchannel | events |
exceptions | general | pvst+ | root | snmp | uplinkfast}
Displays all spanning-tree debugging messages.
Displays debugging messages for BackboneFast events.
Displays debugging messages for spanning-tree Bridge Protocol Data Units
(BPDUs).
Displays debugging messages for optimized BPDU handling.
Displays debugging messages for spanning-tree configuration changes.
Displays debugging messages for EtherChannel support.
Displays debugging messages for spanning-tree topology events.
Displays debugging messages for spanning-tree exceptions.
Displays debugging messages for general spanning-tree activity.
Displays debugging messages for per-VLAN Spanning Tree Plus (PVST+)
events.
Displays debugging messages for spanning-tree root events.
Displays debugging messages for spanning-tree Simple Network Management
Protocol (SNMP) handling.
Displays debugging messages for UplinkFast events.
Modification
This command was introduced.
This command was implemented on the following platforms: Cisco 2600
series, Cisco 3600 series, and Cisco 3700 series routers.