Table Of Contents

Catalyst 3550 Switch Debug Commands

debug acltcam

debug auto qos

debug backup

debug cluster

debug cpu-interface

debug dot1x

debug eap

debug etherchannel

debug ethernet-controller ram-access

debug fallback-bridging

debug gigastack

debug ilpower controller

debug ilpower event

debug ip dhcp snooping

debug ip igmp filter

debug ip igmp max-groups

debug ip verify source packet

debug l3multicast

debug l3tcam

debug l3unicast

debug mac-manager

debug mac-notification

debug met

debug mvrdbg

debug pagp

debug pbr

debug platform ip arp inspection

debug pm

debug port-security

debug span-session

debug spanning-tree

debug spanning-tree backbonefast

debug spanning-tree bpdu

debug spanning-tree bpdu-opt

debug spanning-tree mstp

debug spanning-tree switch

debug spanning-tree uplinkfast

debug sw-vlan

debug sw-vlan ifs

debug sw-vlan notification

debug sw-vlan vtp

debug udld

Catalyst 3550 Switch Debug Commands

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This appendix describes only the Catalyst 3550-specific debug privileged EXEC commands. These commands are helpful in diagnosing and resolving internetworking problems and should be enabled only under the guidance of Cisco technical support staff.

---

Caution Because debugging output is assigned high priority in the CPU process, it can render the system unusable. For this reason, use the debug commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco technical support staff. It is best to use the debug commands during periods of lower network traffic and fewer users. Debugging during these periods decreases the likelihood that increased debug command processing overhead will affect system use.

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debug acltcam

Use the debug acltcam privileged EXEC command to enable debugging of the actions of the quality of service/access control list (QoS/ACL) ternary content addressable memory (TCAM) manager software module. This module controls the allocation and updating of entries in the parts of the TCAM used for input security ACLs, output security ACLs, and QoS ACLs. Use the no form of this command to disable debugging.

debug acltcam [verbose]

no debug acltcam [verbose]

Syntax Description

verbose

(Optional) Display detailed debug messages.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was introduced.

Usage Guidelines

The undebug acltcam command is the same as the no debug acltcam command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.

debug auto qos

Use the debug auto qos privileged EXEC command to enable debugging of the automatic quality of service (auto-QoS) feature. Use the no form of this command to disable debugging.

debug auto qos

no debug auto qos

Syntax Description

This command has no arguments or keywords.

Defaults

Auto-QoS debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(12c)EA1	This command was introduced.
12.1(20)EA2	The command changed from debug autoqos to debug auto qos.

Usage Guidelines

To display the QoS configuration that is automatically generated when auto-QoS is enabled, enable debugging before you enable auto-QoS. You enable debugging by entering the debug auto qos privileged EXEC command.

The undebug auto qos command is the same as the no debug auto qos command.

Examples

This example shows how to display the QoS configuration that is automatically generated when auto-QoS is enabled:

Switch# debug auto qos

AutoQoS debugging is on

Switch# configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

Switch(config)# interface fastethernet0/1

Switch(config-if)# auto qos voip trust

Switch(config-if)#

4d22h:mls qos map cos-dscp 0 8 16 26 32 46 48 56

4d22h:mls qos min-reserve 5 170

4d22h:mls qos min-reserve 6 85

4d22h:mls qos min-reserve 7 51

4d22h:mls qos min-reserve 8 34

4d22h:mls qos

4d22h:interface FastEthernet0/1

4d22h: mls qos trust cos

4d22h: wrr-queue bandwidth 10 20 70 1

4d22h: wrr-queue min-reserve 1 5

4d22h: wrr-queue min-reserve 2 6

4d22h: wrr-queue min-reserve 3 7

4d22h: wrr-queue min-reserve 4 8

4d22h: no wrr-queue cos-map

4d22h: wrr-queue cos-map 1 0 1 

4d22h: wrr-queue cos-map 2 2 4

4d22h: wrr-queue cos-map 3 3 6 7

4d22h: wrr-queue cos-map 4 5

4d22h: priority-queue out

Related Commands

Command	Description
auto qos voip	Configure auto-QoS for voice over IP (VoIP) within a QoS domain.
show auto qos	Displays the configuration applied and the new defaults in effect when auto-QoS is enabled.
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.

debug backup

Use the debug backup privileged EXEC command to enable debugging of the Flex Links backup interface. Use the no form of this command to disable debugging.

debug backup {all | errors | events}

no debug backup {all | errors | events}

Syntax Description

all	Display all backup interface debug messages.
errors	Display backup interface error or exception debug messages.
events	Display backup interface event debug messages.

Command Default

Backup interface debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.2(25)SEE	This command was introduced.

Usage Guidelines

The undebug backup command is the same as the no debug backup command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.

debug cluster

Use the debug cluster privileged EXEC command to enable debugging of cluster-specific events. Use the no form of this command to disable debugging.

debug cluster {discovery | events | extended | hsrp | http | ip [packet] | members | nat | neighbors | snmp | vqpxy}

no debug cluster {discovery | events | extended | hsrp | http | ip [packet] | members | nat | neighbors | snmp | vqpxy}

Syntax Description

discovery	Display cluster discovery debug messages.
events	Display cluster event debug messages.
extended	Display extended discovery debug messages.
hsrp	Display the Hot Standby Router Protocol (HSRP) debug messages.
http	Display HTTP debug messages.
ip [packet]	Display IP or transport packet debug messages.
members	Display cluster member debug messages.
nat	Display Network Address Translation (NAT) debug messages.
neighbors	Display cluster neighbor debug messages.
snmp	Display Simple Network Management Protocol (SNMP) debug messages.
vqpxy	Display VLAN Query Protocol (VQP) proxy debug messages.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was introduced.

Usage Guidelines

The undebug cluster command is the same as the no debug cluster command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
show cluster	Displays the cluster status and a summary of the cluster to which the switch belongs.
show cluster candidates	Displays a list of candidate switches when entered on the command switch.
show cluster members	Displays information about cluster members when executed on the command switch.

debug cpu-interface

Use the debug cpu-interface privileged EXEC command to enable debugging of the driver for the application-specific integrated circuit (ASIC) that interfaces the CPU to the switch ASIC. Use the no form of this command to disable debugging.

debug cpu-interface

no debug cpu-interface

Syntax Description

This command has no arguments or keywords.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was introduced.

Usage Guidelines

The undebug cpu-interface command is the same as the no debug cpu-interface command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.ystem Management Commands > Troubleshooting Commands.

debug dot1x

Use the debug dot1x privileged EXEC command to enable debugging of the IEEE 802.1x authentication feature. Use the no form of this command to disable debugging.

debug dot1x {all | errors | events | feature | packets | registry | state-machine}

no debug dot1x {all | errors | events | feature | packets | registry | state-machine}

Syntax Description

all	Display all IEEE 802.1x authentication debug messages.
errors	Display IEEE 802.1x error debug messages.
events	Display IEEE 802.1x event debug messages.
feature	Display IEEE 802.1x feature debug messages.
packets	Display IEEE 802.1x packet debug messages.
registry	Display IEEE 802.1x registry invocation debug messages.
state-machine	Display state-machine related-events debug messages.

---

Note Though visible in the command-line help strings, the redundancy keyword is not supported.

---

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(8)EA1	This command was introduced.
12.1(14)EA1	The authsm, backend, besm, core, and reauthsm keywords were removed. The errors, events, packets registry, and state-machine keywords were added.
12.2(25)SEE	The feature keyword was added.

Usage Guidelines

The undebug dot1x command is the same as the no debug dot1x command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
show dot1x	Displays IEEE 802.1x statistics, administrative status, and operational status for the switch or for the specified interface.

debug eap

Use the debug eap privileged EXEC command to enable debugging of the Extensible Authentication Protocol (EAP) activity. Use the no form of this command to disable debugging.

debug dot1x {all | authenticator | errors | events | md5 | packets | peer | sm}

no debug dot1x {all | authenticator | errors | events | md5 | packets | peer | sm}

Syntax Description

all	Display all EAP debug messages.
authenticator	Display authenticator debug messages.
errors	Display EAP error debug messages.
events	Display EAP event debug messages.
md5	Display EAP-MD5 debug messages.
packets	Display EAP packet debug messages.
peer	Display EAP peer debug messages.
sm	Display EAP state-machine related-events debug messages.

Command Default

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.2(25)SEE	This command was introduced.

Usage Guidelines

The undebug dot1x command is the same as the no debug dot1x command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, see the Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
show eap	Displays EAP registration and session information for the switch or for the specified port.

debug etherchannel

Use the debug etherchannel privileged EXEC command to enable debugging of the EtherChannel/PAgP shim. This shim is the software module that is the interface between the PAgP software module and the port manager software module. Use the no form of this command to disable debugging.

debug etherchannel [all | detail | error | event | idb]

no debug etherchannel [all | detail | error | event | idb]

Syntax Description

all	(Optional) Display all EtherChannel debug messages.
detail	(Optional) Display detailed EtherChannel debug messages.
error	(Optional) Display EtherChannel error debug messages.
event	(Optional) Display major EtherChannel event debug messages.
idb	(Optional) Display Port Aggregation Protocol (PAgP) interface descriptor block debug messages.

---

Note Though visible in the command-line help strings, the linecard keyword is not supported.

---

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was introduced.

Usage Guidelines

If you do not specify a keyword, all debug messages appear.

The undebug etherchannel command is the same as the no debug etherchannel command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
show etherchannel	Displays EtherChannel information for the channel.

debug ethernet-controller ram-access

Use the debug ethernet-controller ram-access privileged EXEC command to enable debugging of the driver that controls reads from and writes to the private (not directly accessible by the CPU) RAM connected to the forwarding application-specific integrated circuits (ASICs). Use the no form of this command to disable debugging.

debug ethernet-controller ram-access

no debug ethernet-controller ram-access

Syntax Description

This command has no arguments or keywords.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was introduced.

Usage Guidelines

The undebug ethernet-controller ram-access command is the same as the no debug ethernet-controller ram-access command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.

debug fallback-bridging

Use the debug fallback-bridging privileged EXEC command to enable debugging of the fallback bridging manager software module. This command debugs the platform-specific part of the process of learning MAC addresses on bridge groups and updating the hardware with the necessary information. Use the no form of this command to disable debugging.

debug fallback-bridging

no debug fallback-bridging

Syntax Description

This command has no arguments or keywords.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was introduced.

Usage Guidelines

The undebug fallback-bridging command is the same as the no debug fallback-bridging command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.

debug gigastack

Use the debug gigastack privileged EXEC command to enable debugging of the driver actions for the GigaStack Gigabit Interface Converter (GBIC). Use the no form of this command to disable debugging.

debug gigastack

no debug gigastack

Syntax Description

This command has no arguments or keywords.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was introduced.

Usage Guidelines

The undebug gigastack command is the same as the no debug gigastack command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.

debug ilpower controller

Use the debug ilpower controller privileged EXEC command to enable debugging of the platform-specific Power over Ethernet (PoE) software module on the Catalyst 3550-24PWR switch in long message format. These messages include the Power Controller register reading. Use the no form of this command to disable debugging.

debug ilpower controller

no debug ilpower controller

Syntax Description

This command has no arguments or keywords.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(12c)EA1	This command was introduced.

Usage Guidelines

The undebug ilpower controller command is the same as the no debug ilpower controller.

Related Commands

Command	Description
debug ilpower event	Enables debugging of the platform-specific PoE software module in a short message format.

debug ilpower event

Use the debug ilpower event privileged EXEC command to enable debugging of the platform-specific Power over Ethernet (PoE) software module on the Catalyst 3550-24PWR switch in a short message format. These messages display the PoE state and events received. Use the no form of this command to disable debugging.

debug ilpower event

no debug ilpower event

Syntax Description

This command has no arguments or keywords.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(12c)EA1	This command was introduced.

Usage Guidelines

The undebug ilpower event command is the same as the no debug ilpower event.

Related Commands

Command	Description
debug ilpower controller	Enables debugging of the platform-specific PoE software module in long message format.

debug ip dhcp snooping

Use the debug ip dhcp snooping privileged EXEC command to enable debugging of DHCP snooping events. Use the no form of this command to disable debugging.

debug ip dhcp snooping {acl | event | packet}

no debug ip dhcp snooping {acl | event | packet}

Syntax Description

acl	Display all DHCP-snooping access control list (ACL) debug messages.
event	Display all DHCP snooping event debug messages.
packet	Display all DHCP snooping packet debug messages.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(19)EA1	This command was introduced.

Usage Guidelines

The undebug ip dhcp snooping command is the same as the no ip debug dhcp snooping command.

Related Commands

Command	Description
show ip dhcp snooping	Displays the DHCP snooping configuration.
show ip dhcp snooping binding	Displays the DHCP snooping binding information.

debug ip igmp filter

Use the debug ip igmp filter privileged EXEC command to enable debugging of Internet Group Management Protocol (IGMP) filter events. Use the no form of this command to disable debugging.

debug ip igmp filter

no debug ip igmp filter

Syntax Description

This command has no arguments or keywords.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(8)EA1	This command was introduced.

Usage Guidelines

The undebug ip igmp filter command is the same as the no debug ip igmp filter command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.

debug ip igmp max-groups

Use the debug ip igmp max-groups privileged EXEC command to enable debugging of Internet Group Management Protocol (IGMP) maximum group events. Use the no form of this command to disable debugging.

debug ip igmp max-groups

no debug ip igmp max-groups

Syntax Description

This command has no arguments or keywords.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(8)EA1	This command was introduced.

Usage Guidelines

The undebug ip igmp max-groups command is the same as the no debug ip igmp max-groups command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.

debug ip verify source packet

Use the debug ip verify source packet privileged EXEC command to enable debugging of IP source guard. Use the no form of this command to disable debugging.

debug ip verify source packet

no debug ip verify source packet

Syntax Description

This command has no arguments or keywords.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.2(25)SEA	This command was introduced.

Usage Guidelines

The undebug ip verify source packet command is the same as the no debug ip verify source packet command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.

debug l3multicast

Use the debug l3multicast privileged EXEC command to enable debugging of the platform-specific Layer 3 IP multicast manager software module, which maintains platform-specific data describing IP multicast routes. Use the no form of this command to disable debugging.

debug l3multicast

no debug l3multicast

Syntax Description

This command has no arguments or keywords.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was introduced.

Usage Guidelines

The undebug l3multicast command is the same as the no debug l3multicast command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.

debug l3tcam

Use the debug l3tcam privileged EXEC command to enable debugging of the Layer 3 ternary content addressable memory (TCAM) manager software module. This module controls the allocation of the part of the TCAM used in IP unicast and multicast routing, including the allocation of both routes and adjacencies in the TCAM. Use the no form of this command to disable debugging.

debug l3tcam

no debug l3tcam

Syntax Description

This command has no arguments or keywords.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was introduced.

Usage Guidelines

The undebug l3tcam command is the same as the no debug l3tcam command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.

debug l3unicast

Use the debug l3unicast privileged EXEC command to enable debugging of the Layer 3 IP unicast manager. It maintains platform-specific data describing the IP forwarding information base (FIB) entries (routes and adjacencies) and ARP table entries. Use the no form of this command to disable debugging.

debug l3unicast

no debug l3unicast

Syntax Description

This command has no arguments or keywords.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was introduced.

Usage Guidelines

The undebug l3unicast command is the same as the no debug l3unicast command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.

debug mac-manager

Use the debug mac-manager privileged EXEC command to enable debugging of the platform-specific MAC address table manager software module. This command debugs the platform-specific part of learning MAC addresses on VLANs and updating the hardware with the necessary information. Use the no form of this command to disable debugging.

debug mac-manager

no debug mac-manager

Syntax Description

This command has no arguments or keywords.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was introduced.

Usage Guidelines

The undebug mac-manager command is the same as the no debug mac-manager command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.

debug mac-notification

Use the debug mac-notification privileged EXEC command to enable debugging of MAC notification events. Use the no form of this command to disable debugging.

debug mac-notification

no debug mac-notification

Syntax Description

This command has no arguments or keywords.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(8)EA1	This command was introduced.

Usage Guidelines

The undebug mac-notification command is the same as the no debug mac-notification command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
show mac address-table notification	Displays the MAC address notification information for all interfaces or the specified interface.

debug met

Use the debug met privileged EXEC command to enable debugging of the allocation, freeing, and updating of the multicast expansion table (MET) entries. These entries are used by the hardware when forwarding individual IP multicast and fallback-bridged packets to multiple output VLANs. Use the no form of this command to disable debugging.

debug met

no debug met

Syntax Description

This command has no arguments or keywords.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was introduced.

Usage Guidelines

The undebug met command is the same as the no debug met command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.

debug mvrdbg

Use the debug mvrdbg privileged EXEC command to enable debugging of Multicast VLAN Registration (MVR). Use the no form of this command to disable debugging.

debug mvrdbg {all | events | igmpsn | management | ports}

no debug mvrdbg {all | events | igmpsn | management | ports}

Syntax Description

all	Display all MVR activity debug messages.
events	Display MVR event-handling debug messages.
igmpsn	Display MVR Internet Group Management Protocol (IGMP) snooping-activity debug messages.
management	Display MVR management-activity debug messages.
ports	Display MVR port debug messages.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was introduced.

Usage Guidelines

The undebug mvrdbg command is the same as the no debug mvrdbg command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
show mvr	Displays the current MVR configuration.

debug pagp

Use the debug pagp privileged EXEC command to enable debugging of Port Aggregation Protocol (PAgP) activity. Use the no form of this command to disable debugging.

debug pagp [all | event | fsm | misc | packet]

no debug pagp [all | event | fsm | misc | packet]

Syntax Description

all	(Optional) Display all PAgP debug messages.
event	(Optional) Display PAgP event debug messages.
fsm	(Optional) Display PAgP finite state-machine debug messages.
misc	(Optional) Display miscellaneous PAgP debug messages.
packet	(Optional) Display PAgP packet debug messages.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was introduced.

Usage Guidelines

The undebug pagp command is the same as no debug pagp command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
show pagp	Displays PAgP channel-group information.

debug pbr

Use the debug pbr privileged EXEC command to enable debugging of policy-based routing (PBR) events. Use the no form of this command to disable debugging.

debug pbr [acl-merge]

no debug pbr [acl-merge]

Syntax Description

acl-merge

(Optional) Display debug messages for the merge of ACLs present in a route-map that are applied to an interface for PBR.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(13)EA1	This command was introduced.

Usage Guidelines

The undebug pbr command is the same as the no debug pbr command.

debug platform ip arp inspection

Use the debug platform ip arp inspection privileged EXEC command to debug dynamic Address Resolution Protocol (ARP) inspection events. Use the no form of this command to disable debugging.

debug platform ip arp inspection {all | error | event | packet | rpc}

no debug platform ip arp inspection {all | error | event | packet | rpc}

Syntax Description

all	Display all dynamic ARP inspection debug messages.
error	Display dynamic ARP inspection error debug messages.
event	Display dynamic ARP inspection event debug messages.
packet	Display dynamic ARP inspection packet-related debug messages.
rpc	Display dynamic ARP inspection remote procedure call (RPC) request debug messages.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.2(25)SEA	This command was introduced.

Usage Guidelines

The undebug platform ip arp inspection command is the same as the no debug platform ip arp inspection command.

Related Commands

Command	Description
show ip arp inspection	Displays the dynamic ARP inspection configuration and operating state.
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.

debug pm

Use the debug pm privileged EXEC command to enable debugging of port manager (PM) activity. The port manager is a state machine that controls all the logical and physical interfaces. All features, such as VLANs, UniDirectional Link Detection (UDLD), and so forth, work with the port manager to provide switch functions. Use the no form of this command to disable debugging.

debug pm {all | assert | card | cookies | etherchnl | messages | port | registry | sm | span | split | vlan | vp}

no debug pm {all | assert | card | cookies | etherchnl | messages | port | registry | sm | span | split | vlan | vp}

Syntax Description

all	Display all PM debug messages.
assert	Display assert debug messages.
card	Display line-card related-event debug messages.
cookies	Display internal PM cookie validation debug messages.
etherchnl	Display EtherChannel related-event debug messages.
messages	Display PM messages debug messages.
port	Display port-related event debug messages.
registry	Display PM registry invocation debug messages.
sm	Display state-machine related-event debug messages.
span	Display spanning-tree related-event debug messages.
split	Display split-processor debug messages.
vlan	Display VLAN related-event debug messages.
vp	Display virtual port related-event debug messages.

---

Note Though visible in the command-line help strings, the scp and pvlan keywords are not supported.

---

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was introduced.

Usage Guidelines

The undebug pm command is the same as the no debug pm command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.

debug port-security

Use the debug port-security privileged EXEC command to enable debugging of the allocation and states of the port security subsystem. Use the no form of this command to disable debugging.

debug port-security

no debug port-security

Syntax Description

This command has no arguments or keywords.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(8)EA1	This command was introduced.

Usage Guidelines

The undebug port-security command is the same as the no debug port-security command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
show port-security	Displays port-security settings for an interface or for the switch.

debug span-session

Use the debug span-session privileged EXEC command to enable debugging of events occurring in the platform-specific software that implements the Switched Port Analyzer (SPAN) feature. Use the no form of this command to disable debugging.

debug span-session

no debug span-session

Syntax Description

This command has no arguments or keywords.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(6)EA1	This command was introduced.

Usage Guidelines

The undebug span-session command is the same as the no debug span-session command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
show monitor	Displays SPAN session information.

debug spanning-tree

Use the debug spanning-tree privileged EXEC command to enable debugging of spanning-tree activities. Use the no form of this command to disable debugging.

debug spanning-tree {all | backbonefast | bpdu | bpdu-opt | config | csuf/csrt | etherchannel | events | exceptions | general | mstp | pvst+ | root | snmp | switch | synchronization | uplinkfast}

no debug spanning-tree {all | backbonefast | bpdu | bpdu-opt | config | csuf/csrt | etherchannel | events | exceptions | general | mstp | pvst+ | root | snmp | switch | synchronization | uplinkfast}

Syntax Description

all	Display all spanning-tree debug messages.
backbonefast	Display Backbonefast-event debug messages.
bpdu	Display spanning-tree bridge protocol data unit (BPDU) debug messages.
bpdu-opt	Display optimized BPDU handling debug messages.
config	Display spanning-tree configuration change debug messages.
csuf/csrt	Display cross-stack UplinkFast activity debug messages.
etherchannel	Display EtherChannel-support debug messages.
events	Display spanning-tree topology event debug messages.
exceptions	Display spanning-tree exception debug messages.
general	Display general spanning-tree activity debug messages.
mstp	Display Multiple Spanning Tree Protocol event debug messages.
pvst+	Display per-VLAN spanning-tree plus (PVST+) event debug messages.
root	Display spanning-tree root-event debug messages.
snmp	Display spanning-tree Simple Network Management Protocol (SNMP) handling debug messages.
switch	Display switch shim command debug messages. This shim is the software module that is the interface between the generic Spanning Tree Protocol (STP) code and the platform-specific code of various switch platforms.
synchronization	Display the spanning-tree synchronization event debug messages.
uplinkfast	Display UplinkFast-event debug messages.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was introduced.
12.1(9)EA1	The mstp and csuf/csrt keywords were added.

Usage Guidelines

The undebug spanning-tree command is the same as the no debug spanning-tree command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
show spanning-tree	Displays spanning-tree state information.

debug spanning-tree backbonefast

Use the debug spanning-tree backbonefast privileged EXEC command to enable debugging of spanning-tree BackboneFast events. Use the no form of this command to disable debugging.

debug spanning-tree backbonefast [detail | exceptions]

no debug spanning-tree backbonefast [detail | exceptions]

Syntax Description

detail	(Optional) Display detailed BackboneFast debug messages.
exceptions	(Optional) Display spanning-tree BackboneFast-exception debug messages.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was introduced.

Usage Guidelines

The undebug spanning-tree backbonefast command is the same as the no debug spanning-tree backbonefast command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
show spanning-tree	Displays spanning-tree state information.

debug spanning-tree bpdu

Use the debug spanning-tree bpdu privileged EXEC command to enable debugging of received and transmitted spanning-tree bridge protocol data units (BPDUs). Use the no form of this command to disable debugging.

debug spanning-tree bpdu [receive | transmit]

no debug spanning-tree bpdu [receive | transmit]

Syntax Description

receive	(Optional) Display receive BPDU debug messages.
transmit	(Optional) Display transmit BPDU debug messages.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was introduced.

Usage Guidelines

The undebug spanning-tree bpdu command is the same as the no debug spanning-tree bpdu command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
show spanning-tree	Displays spanning-tree state information.

debug spanning-tree bpdu-opt

Use the debug spanning-tree bpdu-opt privileged EXEC command to enable debugging of optimized spanning-tree bridge protocol data unit (BPDU) handling. Use the no form of this command to disable debugging.

debug spanning-tree bpdu-opt [detail | packet]

no debug spanning-tree bpdu-opt [detail | packet]

Syntax Description

detail	(Optional) Display detailed optimized BPDU-handling debug messages.
packet	(Optional) Display packet-level optimized BPDU-handling debug messages.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was introduced.

Usage Guidelines

The undebug spanning-tree bpdu-opt command is the same as the no debug spanning-tree bpdu-opt command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
show spanning-tree	Displays spanning-tree state information.

debug spanning-tree mstp

Use the debug spanning-tree mstp privileged EXEC command to enable debugging of the Multiple Spanning Tree Protocol (MSTP) software. Use the no form of this command to disable debugging.

debug spanning-tree mstp {all | boundary | bpdu-rx | bpdu-tx | errors | flush | init | migration | pm | proposals | region | roles | sanity_check | sync | tc | timers}

no debug spanning-tree mstp {all | boundary | bpdu-rx | bpdu-tx | errors | flush | init | migration | pm | proposals | region | roles | sanity_check | sync | tc | timers}

Syntax Description

all	Display all the debug messages.
boundary	Display flag changes at these boundaries: •An MST region and a single spanning-tree region running RSTP •An MST region and a single spanning-tree region running IEEE 802.1D •An MST region and another MST region with a different configuration
bpdu-rx	Display the received MST bridge protocol data unit (BPDU) debug messages.
bpdu-tx	Display transmitted MST BPDU debug messages.
errors	Display MSTP error debug messages.
flush	Display the port flushing mechanism debug messages.
init	Display the initialization of the MSTP data structure debug messages.
migration	Display the protocol migration state-machine debug messages.
pm	Display MSTP port-manager event debug messages.
proposals	Display debug messages for handshake messages between the designated and root switch.
region	Display debug messages for the region synchronization between the switch processor (SP) and the route processor (RP).
roles	Display MSTP role debug messages.
sanity_check	Display the received BPDU sanity check debug messages.
sync	Display the port synchronization event debug messages.
tc	Display topology change notification event debug messages.
timers	Display debug messages for the MSTP timers for start, stop, and expire events.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(9)EA1	This command was introduced.

Usage Guidelines

The undebug spanning-tree mstp command is the same as the no debug spanning-tree mstp command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
show spanning-tree	Displays spanning-tree state information.

debug spanning-tree switch

Use the debug spanning-tree switch privileged EXEC command to enable debugging of the software interface between the Spanning Tree Protocol (STP) software module and the port manager software module. Use the no form of this command to disable debugging.

debug spanning-tree switch {all | errors | general | helper | pm | rx {decode | errors | interrupt | process} | state | tx [decode]}

no debug spanning-tree switch {all | errors | general | helper | pm | rx {decode | errors | interrupt | process} | state | tx [decode]}

Syntax Description

all	Display all spanning-tree switch debug messages.
errors	Display debug messages for the interface between the spanning-tree software module and the port manager software module.
general	Display general event debug messages.
helper	Display spanning-tree helper task debug messages. Helper tasks handle bulk spanning-tree updates.
pm	Display port manager event debug messages.
rx	Display received bridge protocol data unit (BPDU) handling debug messages. The keywords have these meanings: decode—Display decoded received packets. errors—Display receive error debug messages. interrupt—Display interrupt service request (ISRs) debug messages. process—Display process receive BPDU debug messages. state—Display spanning-tree port state change debug messages.
tx [decode]	Display transmitted BPDU handling debug messages.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was introduced.
12.1(9)EA1	The helper keyword was added.

Usage Guidelines

The undebug spanning-tree switch command is the same as the no debug spanning-tree switch command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
show spanning-tree	Displays spanning-tree state information.

debug spanning-tree uplinkfast

Use the debug spanning-tree uplinkfast privileged EXEC command to enable debugging of spanning-tree UplinkFast events. Use the no form of this command to disable debugging.

debug spanning-tree uplinkfast [exceptions]

no debug spanning-tree uplinkfast [exceptions]

Syntax Description

exceptions

(Optional) Display spanning-tree UplinkFast-exception debug messages.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was introduced.

Usage Guidelines

The undebug spanning-tree uplinkfast command is the same as the no debug spanning-tree uplinkfast command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
show spanning-tree	Displays spanning-tree state information.

debug sw-vlan

Use the debug sw-vlan privileged EXEC command to enable debugging of VLAN manager activities. Use the no form of this command to disable debugging.

debug sw-vlan {badpmcookies | cfg-vlan {bootup | cli} | events | ifs | management | notification | packets | registries | vtp}

no debug sw-vlan {badpmcookies | cfg-vlan {bootup | cli}| events | ifs | management | notification | packets | registries | vtp}

Syntax Description

badpmcookies	Display debug messages for VLAN manager incidents of bad port manager cookies.
cfg-vlan {bootup | cli}	Display config-vlan debug messages. The keywords have these meanings: •bootup—Display messages when the switch is booting up. •cli—Display messages generated when the command-line interface (CLI) is in config-vlan mode.
events	Display VLAN manager event debug messages.
ifs	Display VLAN manager Cisco IOS file system (IFS) error test debug messages.
management	Display VLAN manager management of internal VLAN debug messages.
notification	Display VLAN manager notification debug messages.
packets	Display packet handling and encapsulation process debug messages.
registries	Display VLAN manager registry debug messages.
vtp	Display the VLAN Trunking Protocol (VTP) debug messages.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was introduced.
12.1(9)EA1	The cfg-vlan keyword was added.

Usage Guidelines

The undebug sw-vlan command is the same as the no debug sw-vlan command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
show vlan	Displays the parameters for all configured VLANs or one VLAN (if the VLAN name or ID is specified) in the administrative domain.
show vtp	Displays general information about VTP management domain, status, and counters.

debug sw-vlan ifs

Use the debug sw-vlan ifs privileged EXEC command to enable VLAN manager Cisco IOS file system (IFS) error tests. Use the no form of this command to disable debugging.

debug sw-vlan ifs {open {read | write} | read {1 | 2 | 3 | 4} | write}

no debug sw-vlan ifs {open {read | write} | read {1 | 2 | 3 | 4} | write}

Syntax Description

open {read | write	Display VLAN manager IFS file-open operation debug messages. The keywords have these meanings: •read—Display VLAN manager IFS file-read operation debug messages. •write—Display VLAN manager IFS file-write operation debug messages.
read {1 | 2 | 3 | 4}	Display file-read operation debug messages for the specified error test (1, 2, 3, or 4).
write	Display file-write operation debug messages.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was introduced.

Usage Guidelines

When selecting the file read operation, Operation 1 reads the file header, which contains the header verification word and the file version number. Operation 2 reads the main body of the file, which contains most of the domain and VLAN information. Operation 3 reads type length version (TLV) descriptor structures. Operation 4 reads TLV data.

The undebug sw-vlan ifs command is the same as the no debug sw-vlan ifs command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
show vlan	Displays the parameters for all configured VLANs or one VLAN (if the VLAN name or ID is specified) in the administrative domain.

debug sw-vlan notification

Use the debug sw-vlan notification privileged EXEC command to enable debugging messages that trace the activation and deactivation of Inter-Link Switch (ISL) VLAN IDs. Use the no form of this command to disable debugging.

debug sw-vlan notification {accfwdchange | allowedvlancfgchange | fwdchange | linkchange | modechange | pruningcfgchange | statechange}

no debug sw-vlan notification {accfwdchange | allowedvlancfgchange | fwdchange | linkchange | modechange | pruningcfgchange | statechange}

Syntax Description

accfwdchange	Display debug messages for VLAN manager notification of aggregated access interface spanning-tree forward changes.
allowedvlancfgchange	Display debug messages for VLAN manager notification of changes to the allowed VLAN configuration.
fwdchange	Display debug messages for VLAN manager notification of spanning-tree forwarding changes.
linkchange	Display debug messages for VLAN manager notification of interface link-state changes.
modechange	Display debug messages for VLAN manager notification of interface mode changes.
pruningcfgchange	Display debug messages for VLAN manager notification of changes to the pruning configuration.
statechange	Display debug messages for VLAN manager notification of interface state changes.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was introduced.

Usage Guidelines

The undebug sw-vlan notification command is the same as the no debug sw-vlan notification command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
show vlan	Displays the parameters for all configured VLANs or one VLAN (if the VLAN name or ID is specified) in the administrative domain.

debug sw-vlan vtp

Use the debug sw-vlan vtp privileged EXEC command to enable debugging of the VLAN Trunking Protocol (VTP) code. Use the no form of this command to disable debugging.

debug sw-vlan vtp {events | packets | pruning [packets | xmit] | xmit}

no debug sw-vlan vtp {events | packets | pruning [packets | xmit] | xmit}

Syntax Description

events	Display debug messages for general-purpose logic flow and detailed VTP debugging messages generated by the VTP_LOG_RUNTIME macro in the VTP code.
packets	Display debug messages for the contents of all incoming VTP packets that have been passed into the VTP code from the Cisco IOS VTP platform-dependent layer, except for pruning packets.
pruning [packets | xmit]	Display debug messages generated by the pruning segment of the VTP code. The keywords have these meanings: •packets—(Optional) Display debug messages for the contents of all incoming VTP pruning packets that have been passed into the VTP code from the Cisco IOS VTP platform-dependent layer. •xmit—(Optional) Display debug messages for the contents of all outgoing VTP packets that the VTP code requests the Cisco IOS VTP platform-dependent layer to send.
xmit	Display debug messages for the contents of all outgoing VTP packets that the VTP code requests the Cisco IOS VTP platform-dependent layer to send, except for pruning packets.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was introduced.

Usage Guidelines

If no further parameters are entered after the pruning keyword, VTP pruning debugging messages appear. They are generated by the VTP_PRUNING_LOG_NOTICE, VTP_PRUNING_LOG_INFO, VTP_PRUNING_LOG_DEBUG, VTP_PRUNING_LOG_ALERT, and VTP_PRUNING_LOG_WARNING macros in the VTP pruning code.

The undebug sw-vlan vtp command is the same as the no debug sw-vlan vtp command.

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
show vtp	Displays general information about VTP management domain, status, and counters.

debug udld

Use the debug udld privileged EXEC command to enable debugging of the UniDirectional Link Detection (UDLD) feature. Use the no form of this command to disable debugging.

debug udld {events | packets | registries}

no debug udld {events | packets | registries}

Syntax Description

events	Display debugging messages for UDLD process events as they occur.
packets	Display debugging messages for the UDLD process as it receives packets from the packet queue and tries to send them at the request of the UDLD protocol code.
registries	Display debugging messages for the UDLD process as it processes registry calls from the UDLD process-dependent module and other feature modules.

Defaults

Debugging is disabled.

Command Modes

Privileged EXEC

Command History

Release	Modification
12.1(4)EA1	This command was introduced.

Usage Guidelines

For debug udld events, these debugging messages appear:

•General UDLD program logic flow

•State machine state changes

•Program actions for the set and clear ErrDisable state

•Neighbor cache additions and deletions

•Processing of configuration commands

•Processing of link-up and link-down indications

For debug udld packets, these debugging messages appear:

•General packet processing program flow on receipt of an incoming packet

•Indications of the contents of the various pieces of packets received (such as type length versions [TLVs]) as they are examined by the packet reception code

•Packet transmission attempts and the outcome

For debug udld registries, these categories of debugging messages appear:

•Subblock creation

•Fiber-optic port status changes

•State change indications from the port manager software

•MAC address registry calls

Related Commands

Command	Description
show debugging	Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
show udld	Displays UDLD administrative and operational status for all ports or the specified port.