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This chapter describes the function and displays the syntax for troubleshooting commands. For more information about defaults and usage guidelines, see the corresponding chapter of the Configuration Fundamentals Command Reference.
To clear messages from the logging buffer, use the clear logging privileged EXEC command.
clear loggingTo specify the name of the core dump file, use the exception core-file global configuration command. To return to the default core filename, use the no form of this command.
exception core-file name| name | Name of the core dump file saved on the server. |
To configure the router to dump a core file to a particular server when the router crashes, use the exception dump global configuration command. To disable core dumps, use the no form of this command.
exception dump ip-address| ip-address | IP address of the server that stores the core dump file. |
To cause the router to create a core dump and reboot when certain memory size parameters are violated, use the exception memory global configuration command. To disable the rebooting and core dump, use the no form of this command.
exception memory {fragment size | minimum size}| fragment size | The minimum contiguous block of memory in the free pool, in bytes. |
| minimum size | The minimum size of the free memory pool, in bytes. |
To configure the protocol used for core dumps, use the exception protocol global configuration command. To configure the router to use the default protocol, use the no form of this command.
exception protocol {ftp | rcp | tftp}| ftp | Use FTP for core dumps. |
| rcp | Use rcp for core dumps. |
| tftp | Use TFTP for core dumps. This is the default. |
To configure the router to use only passive FTP connections, use the ip ftp passive global configuration command. To allow all types of FTP connections, use the no form of this command.
ip ftp passiveTo specify the password to be used for FTP connections, use the ip ftp password global configuration command. Use the no form of this command to return the password to its default.
ip ftp password [type] password| type | (Optional) Type of encryption to use on the password. A value of 0 disables encryption. A value of 7 indicates proprietary encryption. |
| password | Password to use for FTP connections. |
To specify the source IP address for FTP connections, use the ip ftp source-interface global configuration command. Use the no form of this command to use the address of the interface where the connection is made.
ip ftp source-interface interface| interface | The interface type and number to use to obtain the source address for FTP connections. |
To configure the username for FTP connections, use the ip ftp username global configuration command. To configure the router to attempt anonymous FTP, use the no form of this command.
ip ftp username username| username | Username for FTP connections. |
To log messages to a syslog server host, use the logging global configuration command. The no form of this command deletes the syslog server with the specified address from the list of syslogs.
logging host| host | Name or IP address of the host to be used as a syslog server. |
To log messages to an internal buffer, use the logging buffered global configuration command. The no form of this command cancels the use of the buffer. The default form of this command returns the buffer size to the default size.
logging buffered [size]| size | (Optional) Size of the buffer from 4096 to 4294967295 bytes. The default size varies by platform. |
To limit messages logged to the console based on severity, use the logging console global configuration command. The no form of this command disables logging to the console terminal.
logging console level| level | Limits the logging of messages displayed on the console terminal to a specified level. |
To configure the syslog facility in which error messages are sent, use the logging facility global configuration command. To revert to the default of local7, use the no form of this command.
logging facility facility-type| facility-type | Syslog facility. |
To limit syslog messages sent to the router's history table and the SNMP network management station based on severity, use the logging history global configuration command. The no form of this command returns the logging of syslog messages to the default level.
logging history level| level | Limits the messages saved in the history table and sent to the SNMP network management station to the specified set of levels. |
To change the number of syslog messages stored in the router's history table, use the logging history size global configuration command. The no form of this command returns the number of messages to the default value.
logging history size number| number | Number from 1 to 500 that indicates the maximum number of messages stored in the history table. |
To limit messages logged to the terminal lines (monitors) based on severity, use the logging monitor global configuration command. This command limits the logging messages displayed on terminal lines other than the console line to messages with a level at or above level. The no form of this command disables logging to terminal lines other than the console line.
logging monitor level| level | Severity level. |
To control logging of error messages, use the logging on global configuration command. This command sends debug or error messages to a logging process, which logs messages to designated locations asynchronously to the processes that generated the messages. The no form of this command disables the logging process.
logging onTo specify the source IP address of syslog packets, use the logging source-interface global configuration command. Use the no form of this command to remove the source designation.
logging source-interface type number| type | Interface type. |
| number | Interface number. |
To synchronize unsolicited messages and debug output with solicited Cisco IOS software output and prompts for a specific console port line, auxiliary port line, or virtual terminal line, use the logging synchronous line configuration command. Use the no form of this command to disable synchronization of unsolicited messages and debug output.
logging synchronous [level severity-level | all] [limit number-of-buffers]| level severity-level | (Optional) Specifies the message severity level. Messages with a severity level equal to or higher than this value are printed asynchronously. Low numbers indicate greater severity and high numbers indicate lesser severity. The default value is 2. |
| all | (Optional) Specifies that all messages are printed asynchronously, regardless of the severity level. |
| limit number-of-buffers | (Optional) Specifies the number of buffers to be queued for the terminal after which new messages are dropped. The default value is 20. |
To limit messages logged to the syslog servers based on severity, use the logging trap global configuration command. The command limits the logging of error messages sent to syslog servers to only those messages at the specified level. Use the no form of this command to disable logging to syslog servers.
logging trap level| level | Severity level. |
Use the ping (packet internet groper) privileged EXEC command to diagnose basic network connectivity on Apollo, AppleTalk, Connectionless Network Service (CLNS), DECnet, IP, Novell IPX, VINES, or XNS networks.
ping [protocol] {host | address}| protocol | (Optional) Protocol keyword, one of apollo, appletalk, clns, decnet, ip, ipx, vines, or xns. |
| host | Host name of system to ping. |
| address | Address of system to ping. |
Use the ping (packet internet groper) user EXEC command to diagnose basic network connectivity on AppleTalk, CLNS, IP, Novell, Apollo, VINES, DECnet, or XNS networks.
ping [protocol] {host | address}| protocol | (Optional) Protocol keyword, one of apollo, appletalk, clns, decnet, ip, ipx, vines, or xns. |
| host | Host name of system to ping. |
| address | Address of system to ping. |
To allow slave Versatile Interface Processor (VIP) cards to log important error messages to the console, use the service slave-log global configuration command. Use the no form of this command to disable slave logging.
service slave-logTo generate keepalive packets on idle incoming network connections (initiated by the remote host), use the service tcp-keepalives-in global configuration command. The no form of this command with the appropriate keyword disables the keepalives.
service tcp-keepalives-inTo generate keepalive packets on idle outgoing network connections (initiated by a user), use the service tcp-keepalives-out global configuration command. The no form of this command with the appropriate keyword disables the keepalives.
service tcp-keepalives-outTo configure the system to timestamp debugging or logging messages, use one of the service timestamps global configuration commands. Use the no form of this command to disable this service.
service timestamps type [uptime]type | Type of message to timestamp: debug or log. |
|---|---|
| uptime | (Optional) Timestamp with time since the system was rebooted. |
| datetime | Timestamp with the date and time. |
| msec | (Optional) Include milliseconds in the date and timestamp. |
| localtime | (Optional) Timestamp relative to the local time zone. |
| show-timezone | (Optional) Include the time zone name in the timestamp. |
Use the show c7200 EXEC command to display information about the CPU and midplane for Cisco 7200 series routers.
show c7200Use the show context EXEC command to display information stored in NVRAM when the router crashes. This command works only on the Cisco 7000 family platforms.
show contextTo display information about the types of debugging that are enabled for your router, use the show debugging privileged EXEC command.
show debuggingUse the show environment EXEC command to display temperature and voltage information on the Cisco 7000 series, Cisco 7200 series, and Cisco 7500 series routers.
show environment [all | last | table]| all | (Optional) Displays a detailed listing of the power supplies, temperature readings, and voltage readings. |
| last | (Optional) Displays the reason for the last system shutdown that was related to voltage or temperature and the environmental status at that time. |
| table | (Optional) Displays the temperature and voltage thresholds and a table that lists the ranges of environmental measurements that are within specification. |
Use the show gt64010 EXEC command to display all GT64010 internal registers and interrupt status on the Cisco 7200 series routers.
show gt64010Use the show logging EXEC command to display the state of logging (syslog).
show logging [history]| history | (Optional) Display information in the syslog history table only. |
Use the show memory EXEC command to show statistics about memory, including memory-free pool statistics.
show memory [memory-type] [free] [summary]| memory-type | (Optional) Memory type to display (processor, multibus, io, sram). If type is not specified, statistics for all memory types present are displayed. |
| free | (Optional) Displays free memory statistics. |
| summary | (Optional) Displays a summary of memory usage including the size and number of blocks allocated for each address of the system call that allocated the block. |
Use the show pci EXEC command to display information about the peripheral component interconnect (PCI) hardware registers or bridge registers for the Cisco 7200 series routers.
show pci {hardware | bridge [register]}| hardware | Displays PCI hardware registers. |
| bridge | Displays PCI bridge registers. |
| register | (Optional) Number of a specific bridge register in the range 0 to 7. If not specified, this command displays information about all registers. |
Use the show processes EXEC command to display information about the active processes.
show processes [cpu]| cpu | (Optional) Displays detailed CPU utilization statistics. |
Use the show processes memory EXEC command to show memory used.
show processes memoryUse the show protocols EXEC command to display the configured protocols.
show protocolsUse the show stacks EXEC command to monitor the stack usage of processes and interrupt routines.
show stacksUse the show tcp EXEC command to display the status of TCP connections.
show tcp [line-number]| line-number | (Optional) Absolute line number of the line for which you want to display Telnet connection status. |
To display a concise description of TCP connection endpoints, use the show tcp brief EXEC command.
show tcp brief [all]| all | (Optional) Displays status for all endpoints. Without this keyword, endpoints in the LISTEN state are not shown. |
To display a snapshot of the time-division multiplexing (TDM) bus connection memory in a Cisco AS5200 access server, use the show tdm connections EXEC command.
show tdm connections [motherboard | slot number]| motherboard | (Optional) Motherboard in the Cisco AS5200 access server. |
| slot number | (Optional) Slot number. |
To display a snapshot of the time-division multiplexing (TDM) bus data memory in a Cisco AS5200 access server, use the show tdm data EXEC command.
show tdm data [motherboard | slot number]| motherboard | (Optional) Motherboard in the Cisco AS5200 access server. |
| slot number | (Optional) Slot number. |
To display general information about the router when reporting a problem, use the show tech-support privileged EXEC command.
show tech-support [page] [password]| page | (Optional) Causes the output to display a page of information at a time. Use the return key to display the next line of output or use the space bar to display the next page of information. If not used, the output scrolls (that is, does not stop for page breaks). |
| password | (Optional) Leaves passwords and other security information in the output. If not used, passwords and other security-sensitive information in the output are replaced with the label "<removed>" (this is the default). |
To test Flash memory on MCI and envm Flash EPROM interfaces, use the test flash EXEC command.
test flashTo test the system interfaces on the modular router, use the test interfaces EXEC command.
test interfacesTo perform a test of Multibus memory (including nonvolatile memory) on the modular router, use the test memory EXEC command. The memory test overwrites memory.
test memoryUse the trace privileged EXEC command to discover the routes that packets will actually take when traveling to their destination.
trace [protocol] [destination]| protocol | (Optional) Protocols that can be used are appletalk, clns, ip and vines. |
| destination | (Optional) Destination address or host name on the command line. The default parameters for the appropriate protocol are assumed and the tracing action begins. |
Use the trace EXEC command to discover the IP routes that packets will actually take when traveling to their destination.
trace [protocol] [destination]| protocol | (Optional) Protocols that can be used are appletalk, clns, ip and vines. |
| destination | (Optional) Destination address or host name on the command line. The default parameters for the appropriate protocol are assumed and the tracing action begins. |
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