Table Of Contents
Debug Commands
debug dot1x
debug etherchannel
debug pagp
debug pm
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
Debug Commands
This appendix describes the Catalyst 2950-specific debug privileged EXEC commands. These commands are helpful in diagnosing and resolving internetworking problems and should be used only with 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.
debug dot1x
Use the debug dot1x privileged EXEC command to enable debugging of the 802.1X feature. Use the no form of this command to disable debugging output.
debug dot1x {all | authsm | backend | besm | core | reauthsm}
no debug dot1x {all | authsm | backend | besm | core | reauthsm}
Syntax Description
all
|
Enable debugging of all conditions.
|
authsm
|
Enable debugging of the authenticator state machine, which is responsible for controlling access to the network through 802.1X-enabled ports.
|
backend
|
Enable debugging of the interaction between the 802.1X process and the switch (Remote Authentication Dial-In User Service [RADIUS] client).
|
besm
|
Enable debugging of the backend state machine, which is responsible for relaying authentication request between the client and the authentication server.
|
core
|
Enable debugging of the 802.1X process, which includes 802.1X initialization, configuration, and the interaction with the port manager module.
|
reauthsm
|
Enable debugging of the re-authentication state machine, which manages periodic re-authentication of the client.
|
Defaults
Debugging is disabled.
Command Modes
Privileged EXEC
Command History
Release
|
Modification
|
12.1(6)EA2
|
This command was first 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, refer to Cisco IOS Configuration Fundamentals Command Reference For IOS Release 12.1 > Cisco IOS System Management Commands > Troubleshooting Commands.
|
show dot1x
|
Displays 802.1X statistics, administrative status, and operational status for the switch or for the specified interface.
|
debug etherchannel
Use the debug etherchannel privileged EXEC command for EtherChannel/Port Aggregation Protocol (PAgP) shim debugging. 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 output.
debug etherchannel [all | detail | error | event | idb | linecard]
no debug etherchannel [all | detail | error | event | idb | linecard]
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) Debug major EtherChannel event messages.
|
idb
|
(Optional) Debug PAgP interface descriptor block messages.
|
linecard
|
(Optional) Keyword to debug Switch-Module Configuration Protocol messages to the line card.
|
Defaults
Debugging is disabled.
Command Modes
Privileged EXEC
Command History
Release
|
Modification
|
12.1(6)EA2
|
This command was first 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, refer to Cisco IOS Configuration Fundamentals Command Reference For IOS Release 12.1 > Cisco IOS System Management Commands > Troubleshooting Commands.
|
show etherchannel
|
Displays EtherChannel information for the channel.
|
debug pagp
Use the debug pagp privileged EXEC command to debug Port Aggregation Protocol (PAgP) activity. Use the no form of this command to disable debugging output.
debug pagp [all | event | fsm | misc | packet]
no debug pagp [all | event | fsm | misc | packet]
Syntax Description
all
|
(Optional) Enable all PAgP debugging.
|
event
|
(Optional) Enable debugging of PAgP events.
|
fsm
|
(Optional) Enable debugging of the PAgP finite state machine.
|
misc
|
(Optional) Enable miscellaneous PAgP debugging.
|
packet
|
(Optional) Enable PAgP packet debugging.
|
Defaults
Debugging is disabled.
Command Modes
Privileged EXEC
Command History
Release
|
Modification
|
12.1(6)EA2
|
This command was first introduced.
|
Usage Guidelines
This command can be entered only from the switch console.
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, refer to Cisco IOS Configuration Fundamentals Command Reference For IOS Release 12.1 > Cisco IOS System Management Commands > Troubleshooting Commands.
|
show pagp
|
Displays PAgP channel-group information.
|
debug pm
Use the debug pm privileged EXEC command to debug port manager (PM) activity. The port manager is a state machine that controls all the logical and physical interfaces. All features, such as VLANs and UniDirectional Link Detection (UDLD), work with the port manager to provide switch functions. Use the no form of this command to disable debugging output.
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 debugging messages.
|
assert
|
Debug assert messages.
|
card
|
Debug line-card related events.
|
cookies
|
Enable internal PM cookie validation.
|
etherchnl
|
Debug EtherChannel-related events.
|
messages
|
Debug PM messages.
|
port
|
Debug port-related events.
|
registry
|
Debug PM registry invocations.
|
sm
|
Debug state-machine related events.
|
span
|
Debug spanning-tree related events.
|
split
|
Debug split-processor.
|
vlan
|
Debug VLAN-related events.
|
vp
|
Debug virtual-port related events.
|
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(6)EA2
|
This command was first 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, refer to Cisco IOS Configuration Fundamentals Command Reference For IOS Release 12.1 > Cisco IOS System Management Commands > Troubleshooting Commands.
|
debug spanning-tree
Use the debug spanning-tree privileged EXEC command to debug spanning-tree activities. Use the no form of this command to disable debugging output.
debug spanning-tree {all | backbonefast | bpdu | bpdu-opt | config | csuf | etherchannel | events
| exceptions | general | mstp | pvst+ | root | snmp | switch | uplinkfast}
no debug spanning-tree {all | backbonefast | bpdu | bpdu-opt | config | csuf | etherchannel |
events | exceptions | general | mstp | pvst+ | root | snmp | switch | uplinkfast}
Syntax Description
all
|
Display all spanning-tree debugging messages.
|
backbonefast
|
Debug Backbonefast events.
|
bpdu
|
Debug spanning-tree bridge protocol data units (BPDUs).
|
bpdu-opt
|
Debug optimized BPDU handling.
|
config
|
Debug spanning-tree configuration changes.
|
csuf
|
Debug cross-stack UplinkFast activity.
|
etherchannel
|
Debug EtherChannel support.
|
events
|
Debug spanning-tree topology events.
|
exceptions
|
Debug spanning-tree exceptions.
|
general
|
Debug general spanning-tree activity.
|
mstp
|
Debug Multiple Spanning Tree Protocol events.
|
pvst+
|
Debug Per-VLAN Spanning Tree Plus (PVST+) events.
|
root
|
Debug spanning-tree root events.
|
snmp
|
Debug spanning-tree Simple Network Management Protocol (SNMP) handling.
|
switch
|
Debug switch shim commands. 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.
|
uplinkfast
|
Debug UplinkFast events.
|
Defaults
Debugging is disabled.
Command Modes
Privileged EXEC
Command History
Release
|
Modification
|
12.1(6)EA2
|
This command was first introduced.
|
12.1(9)EA1
|
The mstp and csuf 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 Configuration Fundamentals Command Reference For IOS Release 12.1 > Cisco IOS System Management Commands > Troubleshooting Commands.
|
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 output.
debug spanning-tree backbonefast [detail | exceptions]
no debug spanning-tree backbonefast [detail | exceptions]
Syntax Description
detail
|
(Optional) Display detailed BackboneFast debugging messages.
|
exceptions
|
(Optional) Enable debugging of spanning-tree BackboneFast exceptions.
|
Defaults
Debugging is disabled.
Command Modes
Privileged EXEC
Command History
Release
|
Modification
|
12.1(6)EA2
|
This command was first introduced.
|
Usage Guidelines
This command can be entered only from the switch console.
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 Configuration Fundamentals Command Reference For IOS Release 12.1 > Cisco IOS System Management Commands > Troubleshooting Commands.
|
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 output.
debug spanning-tree bpdu [receive | transmit]
no debug spanning-tree bpdu [receive | transmit]
Syntax Description
receive
|
(Optional) Enable receive BPDU debugging.
|
transmit
|
(Optional) Enable transmit BPDU debugging.
|
Defaults
Debugging is disabled.
Command Modes
Privileged EXEC
Command History
Release
|
Modification
|
12.1(6)EA2
|
This command was first introduced.
|
Usage Guidelines
This command can be entered only from the switch console.
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 Configuration Fundamentals Command Reference For IOS Release 12.1 > Cisco IOS System Management Commands > Troubleshooting Commands.
|
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 units (BPDUs) handling. Use the no form of this command to disable debugging output.
debug spanning-tree bpdu-opt [detail | packet]
no debug spanning-tree bpdu-opt [detail | packet]
Syntax Description
detail
|
(Optional) Debug detailed optimized BPDU handling.
|
packet
|
(Optional) Debug packet-level optimized BPDU handling.
|
Defaults
Debugging is disabled.
Command Modes
Privileged EXEC
Command History
Release
|
Modification
|
12.1(6)EA2
|
This command was first introduced.
|
Usage Guidelines
This command can be entered only from the switch console.
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 Configuration Fundamentals Command Reference For IOS Release 12.1 > Cisco IOS System Management Commands > Troubleshooting Commands.
|
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 output.
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
|
Enable all the debugging messages.
|
boundary
|
Debug 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 802.1d
•An MST region and another MST region with a different configuration
|
bpdu-rx
|
Debug the received MST bridge protocol data units (BPDUs)
|
bpdu-tx
|
Debug the transmitted MST BPDUs.
|
errors
|
Debug MSTP errors.
|
flush
|
Debug the port flushing mechanism.
|
init
|
Debug the initialization of the MSTP data structures.
|
migration
|
Debug the protocol migration state machine.
|
pm
|
Debug MSTP port manager events.
|
proposals
|
Debug handshake messages between the designated and root switch.
|
region
|
Debug the region synchronization between the switch processor (SP) and the route processor (RP).
|
roles
|
Debug MSTP roles.
|
sanity_check
|
Debug the received BPDU sanity check messages.
|
sync
|
Debug the port synchronization events.
|
tc
|
Debug topology change notification events.
|
timers
|
Debug 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 first introduced.
|
Usage Guidelines
This command can be entered only from the switch console.
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 Configuration Fundamentals Command Reference For IOS Release 12.1 > Cisco IOS System Management Commands > Troubleshooting Commands.
|
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 output.
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
|
Enable all the debugging messages.
|
errors
|
Enable debugging of error messages for the interface between the spanning-tree software module and the port manager software module.
|
general
|
Enable debugging of general events.
|
helper
|
Enable debugging of the spanning-tree helper task, which handles bulk spanning-tree updates.
|
pm
|
Enable debugging of port manager events.
|
rx
|
Display received bridge protocol data unit (BPDU) handling debugging messages. The keywords have these meanings:
decode—Enable debugging of received packets.
errors—Enable debugging of receive errors.
interrupt—Enable debugging of interrupt service requests (ISRs).
process—Enable debugging of process receive BPDUs.
state—Enable debugging of spanning-tree port state changes.
|
tx [decode]
|
Display transmitted BPDU handling debugging messages.
|
Defaults
Debugging is disabled.
Command Modes
Privileged EXEC
Command History
Release
|
Modification
|
12.1(6)EA2
|
This command was first introduced.
|
12.1(9)EA1
|
The helper keyword was added.
|
Usage Guidelines
This command can be entered only from the switch console.
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 Configuration Fundamentals Command Reference For IOS Release 12.1 > Cisco IOS System Management Commands > Troubleshooting Commands.
|
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 output.
debug spanning-tree uplinkfast [exceptions]
no debug spanning-tree uplinkfast [exceptions]
Syntax Description
exceptions
|
(Optional) Enable debugging of spanning-tree UplinkFast exceptions.
|
Defaults
Debugging is disabled.
Command Modes
Privileged EXEC
Command History
Release
|
Modification
|
12.1(6)EA2
|
This command was first introduced.
|
Usage Guidelines
This command can be entered only from the switch console.
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 Configuration Fundamentals Command Reference For IOS Release 12.1 > Cisco IOS System Management Commands > Troubleshooting Commands.
|
show spanning-tree
|
Displays spanning-tree state information.
|
debug sw-vlan
Use the debug sw-vlan privileged EXEC command to debug VLAN manager activities. Use the no form of this command to disable debugging output.
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 VLAN manager incidents of bad port manager cookies.
|
cfg-vlan bootup
|
Debug config-vlan messages generated when the switch is booting up.
|
cfg-vlan cli
|
Debug messages generated when the CLI is in config-vlan mode.
|
events
|
Debug VLAN manager events.
|
ifs
|
Debug VLAN manager IOS file system (IFS) error tests.
|
management
|
Debug VLAN manager management of internal VLANs.
|
notification
|
Debug VLAN manager notifications.
|
packets
|
Debug packet handling and encapsulation processes.
|
registries
|
Debug VLAN manager registries.
|
vtp
|
Debug the VLAN Trunking Protocol (VTP).
|
Defaults
Debugging is disabled.
Command Modes
Privileged EXEC
Command History
Release
|
Modification
|
12.1(6)EA2
|
This command was first 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, refer to Cisco IOS Configuration Fundamentals Command Reference For IOS Release 12.1 > Cisco IOS System Management Commands > Troubleshooting Commands.
|
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 IOS file system (IFS) error tests. Use the no form of this command to disable debugging output.
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
|
Enable VLAN manager IFS debugging of errors in an IFS file open operation.
|
read
|
Enable debugging of errors that occurred when opening the IFS VLAN configuration file in order to read it.
|
write
|
Enable debugging of errors that occurred when opening the IFS VLAN configuration file in order to write to it.
|
read
|
Enable debugging of errors that occurred when performing an IFS file read operation.
|
{1 | 2 | 3 | 4}
|
Specify the file read operation.
|
write
|
Enable debugging of errors that occurred when performing an IFS file write operation.
|
Defaults
Debugging is disabled.
Command Modes
Privileged EXEC
Command History
Release
|
Modification
|
12.1(6)EA2
|
This command was first introduced.
|
Usage Guidelines
When determining 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, refer to Cisco IOS Configuration Fundamentals Command Reference For IOS Release 12.1 > Cisco IOS System Management Commands > Troubleshooting Commands.
|
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 output.
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
|
Enable VLAN manager notification of aggregated access interface Spanning Tree Protocol (STP) forward changes.
|
allowedvlancfgchange
|
Enable VLAN manager notification of changes to the allowed VLAN configuration.
|
fwdchange
|
Enable VLAN manager notification of STP forwarding changes.
|
linkchange
|
Enable VLAN manager notification of interface link-state changes.
|
modechange
|
Enable VLAN manager notification of interface mode changes.
|
pruningcfgchange
|
Enable VLAN manager notification of changes to the pruning configuration.
|
statechange
|
Enable VLAN manager notification of interface state changes.
|
Defaults
Debugging is disabled.
Command Modes
Privileged EXEC
Command History
Release
|
Modification
|
12.1(6)EA2
|
This command was first 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, refer to Cisco IOS Configuration Fundamentals Command Reference For IOS Release 12.1 > Cisco IOS System Management Commands > Troubleshooting Commands.
|
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 messages to be generated by the VLAN Trunking Protocol (VTP) code. Use the no form of this command to disable debugging output.
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 general-purpose logic flow and detailed VTP debugging messages generated by the VTP_LOG_RUNTIME macro in the VTP code.
|
packets
|
Display the contents of all incoming VTP packets that have been passed into the VTP code from the IOS VTP platform-dependent layer, except for pruning packets.
|
pruning
|
Enable debugging message to be generated by the pruning segment of the VTP code.
|
packets
|
(Optional) Display the contents of all incoming VTP pruning packets that have been passed into the VTP code from the IOS VTP platform-dependent layer.
|
xmit
|
(Optional) Display the contents of all outgoing VTP packets that the VTP code requests the IOS VTP platform-dependent layer to send.
|
xmit
|
Display the contents of all outgoing VTP packets that the VTP code requests the 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(6)EA2
|
This command was first 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, refer to Cisco IOS Configuration Fundamentals Command Reference For IOS Release 12.1 > Cisco IOS System Management Commands > Troubleshooting Commands.
|
show vtp
|
Displays general information about VTP management domain, status, and counters.
|
debug udld
Use the debug udld privileged EXEC command to display the UniDirectional Link Detection (UDLD) debug messages. Use the no form of this command to disable UDLD debugging.
debug udld {events | packets | registries}
no debug udld {events | packets | registries}
Syntax Description
events
|
Enable debugging messages for UDLD process events as they occur.
|
packets
|
Enable debugging messages for the UDLD process as it receives packets from the packet queue and tries to transmit them at the request of the UDLD protocol code.
|
registries
|
Enable debugging messages for the UDLD process as it processes registry calls from the UDLD process-dependent module and other feature modules.
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Defaults
Debugging is disabled.
Command Modes
Privileged EXEC
Command History
Release
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Modification
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12.1(6)EA2
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This command was first introduced.
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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:
•Sub-block creation
•Fiber-port status changes
•State change indications from the port manager software
•MAC address registry calls
Related Commands
Command
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Description
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show debugging
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Displays information about the types of debugging that are enabled. For syntax information, refer to Cisco IOS Configuration Fundamentals Command Reference For IOS Release 12.1 > Cisco IOS System Management Commands > Troubleshooting Commands.
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show udld
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Displays UDLD administrative and operational status for all ports or the specified port.
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