Cisco NM-8B-U User Guide - Page 168
debug spanning-tree
UPC - 074632001001
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debug spanning-tree 16- and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series 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. 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} Syntax Description 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. Defaults Debugging is disabled. Command Modes Privileged EXEC Command History Release 12.1(6)EA2 12.2(15)ZJ Modification This command was introduced. This command was implemented on the following platforms: Cisco 2600 series, Cisco 3600 series, and Cisco 3700 series routers. Usage Guidelines The undebug spanning-tree command is the same as the no debug spanning-tree command. 168 Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ