If it is set to anything else, you must manually boot the switch from the boot loader mode. If the BOOT environment variable is not set, the system attempts to load and execute the first executable image it can find by using a recursive, depth-first search through the flash: file system.
If the BOOT variable is set but the specified images cannot be loaded, the system attempts to boot the first bootable file that it can find in the flash: file system. Valid values are 1, Yes, On, 0, No, and Off. If set to 1, Yes, or On, you can interrupt the automatic boot process by pressing the Break key on the console after the flash: file system has initialized.
Helper files extend or patch the functionality of the boot loader. PS1 prompt —Specifies a string that is used as the command-line prompt in boot loader mode.
The Cisco IOS software inherits the baud rate setting from the boot loader and continues to use this value unless the configuration file specifies another setting. Valid values are 50, 75, , , , , , , , , , , , , , , , , , , , and Environment variables that have values are stored in the flash: file system in various files. Each line in the files contains an environment variable name and an equal sign followed by the value of the variable.
A variable has no value if it is not listed in these files; it has a value if it is listed even if the value is a null string. Environment variables that have values are stored in flash memory outside of the flash: file system. Under typical circumstances, it is not necessary to alter the setting of the environment variables.
You can verify your setting by using the set boot loader command. To display the settings of the boot environment variables, use the show boot privileged EXEC command. This example shows the output from the show boot command. The table below describes each field in the display:. Displays a semicolon-separated list of executable files to try to load and execute when automatically booting up.
In a depth-first search of a directory, each encountered subdirectory is completely searched before continuing the search in the original directory.
If the BOOT variable is set but the specified images cannot be loaded, the system attempts to boot up with the first bootable file that it can find in the flash: file system.
Displays the filename that Cisco IOS uses to read and write a nonvolatile copy of the system configuration. Displays the filename that Cisco IOS uses to read and write a private nonvolatile copy of the system configuration. Displays whether a break is permitted during booting up is enabled or disabled. If it is set to yes, on, or 1, you can interrupt the automatic bootup process by pressing the Break key on the console after the flash: file system is initialized.
Displays whether the switch automatically or manually boots up. If it is set to no or 0, the bootloader attempts to automatically boot up the system. If it is set to anything else, you must manually boot up the switch from the bootloader mode. Displays a semicolon-separated list of loadable files to dynamically load during the bootloader initialization.
Helper files extend or patch the functionality of the bootloader. Displays whether the switch stack is set to automatically copy its software version to an incompatible switch so that it can join the stack. A switch in version-mismatch mode is a switch that has a different stack protocol version than the version on the stack. Switches in version-mismatch mode cannot join the stack. If the stack has an image that can be copied to a switch in version-mismatch mode, and if the boot auto-copy-sw feature is enabled, the stack automatically copies the image from another stack member to the switch in version-mismatch mode.
The switch then exits version-mismatch mode, reboots, and joins the stack. Displays the buffer size that Cisco IOS uses to hold a copy of the configuration file in memory. The configuration file cannot be larger than the buffer size allocation. This example shows the output from the show cable-diagnostics prbs interface interface-id command on a switch :. The location of the problem on the cable, with respect to your switch.
PRBS can only find the location in one of these cases:. The name of the pair of wires to which the local pair is connected. PRBS can learn about the remote pair only when the cable is properly connected and the link is up.
This example shows the output from the show interface interface-id command when PRBS is running:. This example shows the output from the show cable-diagnostics prbs interface interface-id command when PRBS is not running:.
This example shows the output from the show cable-diagnostics tdr interface interface-id command on a switch :. TDR can only find the location in one of these cases:. TDR can learn about the remote pair only when the cable is properly connected and the link is up.
This example shows the output from the show interface interface-id command when TDR is running:. This example shows the output from the show cable-diagnostics tdr interface interface-id command when TDR is not running:.
To display the cluster status and a summary of the cluster to which the switch belongs, use the show cluster EXEC command. This command can be entered on the cluster command switch and cluster member switches. If you enter this command on a switch that is not a cluster member, the following error message appears:. On a cluster member switch, this command displays the identity of the cluster command switch, the switch member number, and the state of its connectivity with the cluster command switch.
On a cluster command switch stack or cluster command switch, this command displays the cluster name and the total number of members. It also shows the cluster status and time since the status changed. If redundancy is enabled, it displays the primary and secondary command-switch information.
This example shows the output from the show cluster command entered on the cluster command switch:. This example shows the output from the show cluster command entered on a cluster member switch:. This example shows the output from the show cluster command entered on a cluster member switch that has lost connectivity with member This example shows the output from the show cluster command entered on a cluster member switch that has lost connectivity with the cluster command switch:.
To display a list of candidate switches, use the show cluster candidates EXEC command. The SN in the display means switch member number. If E appears in the SN column, it means that the switch is discovered through extended discovery. If E does not appear in the SN column, it means that the switch member number is the upstream neighbor of the candidate switch. The hop count is the number of devices the candidate is located from the cluster command switch.
This example shows the output from the show cluster candidates command:. This example shows the output from the show cluster candidates that uses the MAC address of a cluster member switch directly connected to the cluster command switch:. This example shows the output from the show cluster candidates that uses the MAC address of a cluster member switch that is three hops from the cluster edge:. This example shows the output from the show cluster candidates detail command:.
To display information about cluster members, use the show cluster members privileged EXEC command. This example shows the output from the show cluster members command. The SN in the display means switch number. This example shows the output from the show cluster members for cluster member This example shows the output from the show cluster members detail command:.
Uses the switch number parameter to specify the switch number, which is the stack member number. If the switch is in a stack, the range is 1 to 8, depending on the switch member numbers in the stack. Displays the unique device identifier UDI information for the standalone switch or specified stack members.
Displays the hardware-related system messages generated by the standalone switch or specified stack members. Optional Displays the data from the specified time and date. The continuous file is circular. When the continuous file is full, the switch combines the data into a summary file, which is also known as a historical file.
Creating the summary file frees up space in the continuous file so that the switch can write newer data to it. Use the start and end keywords to display data collected only during a particular time period.
When specifying the start and end times, follow these guidelines:. Make sure to use the colons :. The range is from 1 to You can enter the full name of the month, such as January or august , or the first three letters of the month, such as jan or Aug.
The range is from to This example shows the output from the show logging onboard clilog continuous command:. This example shows the output from the show logging onboard poe continuous end jan command on a switch:.
This example shows the output from the show logging onboard status command:. This example shows the output from the show logging onboard temperature continuous command:. This example shows the output from the show logging onboard uptime summary command:. This example shows the output from the show logging onboard voltage summary command:.
This command can display static and dynamic entries or the MAC address table static and dynamic entries on a specific interface or VLAN. This example shows the output from the show mac address-table command:. Optional Displays information for a specific interface. This example shows the output from the show mac address-table address command:. To display the aging time of address table entries, use the show mac address-table aging-time command in EXEC mode.
This example shows the output from the show mac address-table aging-time command:. This example shows the output from the show mac address-table aging-time vlan 10 command:. This example shows the output from the show mac address-table count command:. H available in privileged EXEC mode only. Optional Specifies an interface to match; valid interfaces include physical ports and port channels. This example shows the output from the show mac address-table dynamic command:.
This example shows the output from the show mac address-table interface command:. Use the show mac address-table learning command without any keywords to display configured VLANs and whether MAC address learning is enabled or disabled on them. This example shows the output from the show mac address-table learning command showing that MAC address learning is disabled on VLAN To display the MAC address-table move update information on the switch , use the show mac address-table move update command in EXEC mode.
This example shows the output from the show mac address-table move update command:. To display information about the multicast MAC address table, use the show mac-address-table multicast command.
For the MAC address table entries that are used by the routed ports, the routed port name is displayed in the "vlan" column, not the internal VLAN number.
To display the MAC address notification settings for all interfaces or the specified interface, use the show mac address-table notification command in EXEC mode. Optional Displays information for all interfaces. Use the show mac address-table notification change command without keywords to see if the MAC address change notification feature is enabled or disabled, the number of seconds in the MAC notification interval,.
Use the interface keyword to display the notifications for all interfaces. If the interface ID is included, only the flags for that interface appear.
This example shows the output from the show mac address-table notification change command:. This example shows the output from the show mac address-table secure command:.
This example shows the output from the show mac address-table static command:. This example shows the output from the show mac address-table vlan 1 command:. Displays details for all of the NMSP services to which the controller is subscribed.
The following is sample output from the show nmsp notification interval command:. Displays the UDI information for a standalone switch or the specified stack members. Displays the hardware-related messages generated by a standalone switch or the specified stack members.
Displays the time when a standalone switch or the specified stack members start, the reason the standalone switch or specified stack members restart, and the length of time that the standalone switch or specified stack members have been running since they last restarted.
The following example displays the UDI information for a standalone switch or the specified stack members. The following example displays the hardware-related messages generated by a standalone switch or the specified stack members. The following example displays the counter information on a standalone switch or the specified stack members. The following example displays the temperature of a standalone switch or the specified stack members. The following example displays the time when a standalone switch or the specified stack members start, the reason the standalone switch or the specified stack members restart, and the length of time that the standalone switch or the specified stack members have been running since they last restarted.
The following example displays the system voltages of a standalone switch or the specified stack members. To shut down VLAN switching, use the shutdown command in global configuration mode. To disable the configuration set, use the no form of this command. This example shows how to shutdown a VLAN:.
This example shows that the access point is not shut down:. After you run PRBS by using the test cable-diagnostics prbs interface interface-id command, use the show cable-diagnostics prbs interface interface-id privileged EXEC command to display the results. After you run TDR by using the test cable-diagnostics tdr interface interface-id command, use the show cable-diagnostics tdr interface interface-id privileged EXEC command to display the results.
Optional Specifies the VLAN on which to trace the Layer 2 path that the packets take from the source switch to the destination switch. Do not disable CDP. When the switch detects a device in the Layer 2 path that does not support Layer 2 traceroute, the switch continues to send Layer 2 trace queries and lets them time out.
Layer 2 traceroute supports only unicast traffic. If you specify a multicast source or destination MAC address, the physical path is not identified, and an error message appears. The traceroute mac command output shows the Layer 2 path when the specified source and destination addresses belong to the same VLAN. If you specify source and destination addresses that belong to different VLANs, the Layer 2 path is not identified, and an error message appears. The Layer 2 traceroute feature is not supported when multiple devices are attached to one port through hubs for example, multiple CDP neighbors are detected on a port.
When more than one CDP neighbor is detected on a port, the Layer 2 path is not identified, and an error message appears. This example shows how to display the Layer 2 path by specifying the source and destination MAC addresses:. This example shows how to display the Layer 2 path by using the detail keyword:. This example shows how to display the Layer 2 path by specifying the interfaces on the source and destination switch es:.
This example shows the Layer 2 path when the switch is not connected to the source switch :. This example shows the Layer 2 path when the switch cannot find the destination port for the source MAC address:.
To display the Layer 2 path taken by the packets from the specified source IP address or hostname to the specified destination IP address or hostname, use the traceroute mac ip command in privileged EXEC mode. The IP address of the source switch as a bit quantity in dotted-decimal format. The IP address of the destination switch as a bit quantity in dotted-decimal format. The traceroute mac ip command output shows the Layer 2 path when the specified source and destination IP addresses are in the same subnet.
This example shows how to display the Layer 2 path by specifying the source and destination IP addresses and by using the detail keyword:. This example shows how to display the Layer 2 path by specifying the source and destination hostnames:. To display the contents of one or more files, use the type command in boot loader mode. To reset one or more environment variables, use the unset command in boot loader mode.
BOOT —Resets the list of executable files to try to load and execute when automatically booting. HELPER —Identifies the semicolon-separated list of loadable files to dynamically load during the boot loader initialization.
PS1 —Specifies the string that is used as the command-line prompt in boot loader mode. The BOOT environment variable can also be reset by using the no boot system global configuration command. To display the boot loader version, use the version command in boot loader mode. This example shows how to display the boot loader version on a switch :. Skip to content Skip to search Skip to footer. Book Contents Book Contents. Find Matches in This Book.
PDF - Complete Book 7. Updated: February 11, Specifies a directory for the images. Unconditionally forces a system reload after successfully downloading the software image. Keeps the old software version after a successful download.
This feature is supported only on the LAN Base image. Overwrites the software image in flash memory with the downloaded image. Specifies the source URL alias for a local or network file system. Cisco IOS This command was introduced. Creates a new TAR file on the local or network file system.
Displays the contents of an existing TAR file to the screen. Extracts files from a TAR file to the local file system. Optional Specifies the specific version string of the image to be uploaded. The destination URL alias for a local or network file system. Optional Displays smart log statistics for the specified interface. Optional Displays a summary of the smart log event statistics. The valid range is from to Despite setting this command, you can interrupt the automatic boot process at any time by pressing the MODE button on the switch front panel.
The length of time before the system times out, after trying to download a configuration file. The name of the boot image configuration file. Optional Sets the system image for switches in the stack. This command is supported only on the LAN Base image. The identity of the specified switch. The range is from 1 to 4. Deletes all dynamic MAC addresses. Optional Deletes the specified dynamic MAC address.
Optional Deletes all dynamic MAC addresses on the specified physical port or port channel. Clears the notifications in the history table and reset the counters. The MAC address of the cluster command switch. Optional Specifies the number of a configured cluster member switch. Optional Specifies the name of the configured cluster up to 31 characters. Optional The number that identifies a cluster member. Specifies the MAC address of the cluster member switch in hexadecimal format.
Interval in seconds between heartbeat messages. Use usbflash0: for USB memory sticks. Path directory and filename source to be copied. After these files are uploaded, the upload algorithm creates the file format. You upload a switch image file to a server for backup purposes. You can use this uploaded image for future downloads to the switch or another switch of the same type. You can copy images files to or from an FTP server. When you copy an image file from the switch to a server by using FTP, the Cisco IOS software sends the first valid username in this list:.
The switch sends the first valid password in this list:. The username and password must be associated with an account on the FTP server. If you are writing to the server, the FTP server must be properly configured to accept the FTP write request from you.
Use the ip ftp username and ip ftp password commands to specify a username and password for all copies. Include the username in the archive download-sw or archive upload-sw privileged EXEC command if you want to specify a username only for that operation. If the server has a directory structure, the image file is written to or copied from the directory associated with the username on the server. For example, if the image file resides in the home directory of a user on the server, specify that user's name as the remote username.
Before you begin downloading or uploading an image file by using FTP, complete these tasks:. For more information, see the documentation for your FTP server. You can download a new image file and overwrite the current image or keep the current image. To keep the current image, follow Steps 1 to 6 and Step 8. Optional Enters global configuration mode on the switch. This step is required only if you override the default remote username or password.
Optional Changes the default remote FTP username. Optional Downloads the image files from the FTP server to the switch, and overwrites the current image. Optional Downloads the image files from the FTP server to the switch, and saves the current image. If there is not enough space to install the new image and keep the running image, the download process stops, and an error message is displayed.
The algorithm installs the downloaded image onto the system board flash device flash:. For file-url , enter the directory name of the old software image. You can upload an image from the switch to an FTP server. You can later download this image to the same switch or to another switch of the same type.
Uploads the currently running switch image to the FTP server. The archive upload-sw command builds an image file on the server by uploading these files in order: info, the Cisco IOS image, and the web management files. You can use this uploaded image for future downloads to the same switch or another of the same type.
RCP provides another method of downloading and uploading image files between remote hosts and the switch. The RCP copy commands rely on the rsh server or daemon on the remote system. You only need to have access to a server that supports the remote shell rsh.
Most UNIX systems support rsh. Because you are copying a file from one place to another, you must have read permission on the source file and write permission on the destination file. If the destination file does not exist, RCP creates it for you. For the RCP copy request to execute successfully, an account must be defined on the network server for the remote username. If the server has a directory structure, the image file is written to or copied from the directory associated with the remote username on the server.
Before you begin downloading or uploading an image file by using RCP, do these tasks:. If the switch IP address translates to Switch1.
For more information, see the documentation for your RCP server. You can download a new image file and replace or keep the current image. To keep the current image, go to Step 6. This step is required only if you override the default remote username see Steps 4 and 5. Downloads the images file from the RCP server to the switch and overwrites the current image.
Downloads the images file from the RCP server to the switch and saves the current image. If there is not enough room to install the new image and keep the running image, the download process stops, and an error message is displayed. You can upload an image from the switch to an RCP server. The upload feature should be used only if the web management pages associated with Device Manager have been installed with the existing image.
Uploads the currently running switch image to the network server. Skip to content Skip to search Skip to footer. You can convert the access point from a lightweight unit back to an autonomous unit by loading a Cisco IOS release that supports autonomous mode. If the access point is associated to a controller, you can use the controller to load the Cisco IOS release.
Log on to the CLI on the controller to which the access point is associated. Exec commands: access-enable Create a temporary Access-List entry access-profile Apply user-profile to interface access-template Create a temporary Access-List entry capwap capwap exec commands cd Change current directory clear Reset functions clock Manage the system clock crypto Encryption related commands.
JD16" Last reload reason: Invalid image opcode. This product contains cryptographic features and is subject to United States and local country laws governing import, export, transfer and use. Delivery of Cisco cryptographic products does not imply third-party authority to import, export, distribute or use encryption.
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