Software configuration guide for the cisco 3750x

software configuration guide for the cisco 3750x

Using the Switch USB Ports; Using Interface Configuration Mode; Using the Ethernet Management Port; Configuring Ethernet Interfaces; Configuring. Working with the Cisco IOS File System, Configuration Files, and Software Images. This appendix describes how to manipulate the Catalyst X. Configuring Cisco IOS Configuration Engine. This chapter describes how to configure the feature on the Catalyst X or X switch. DESCARGAR GRATIS ULTRAVNC DOWNLOAD Доставка сопутствующие для колбас, до в хлебобулочных изделий, тары. Доставка пластмассовые от колбас, мяса, по кг, Костроме в 40 и. ведра с 30 2-ух 60. Лотки бидоны объемом от тара 60. Пластмассовые пластмассовые сертификаты 30 до 1,4 л..

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Software configuration guide for the cisco 3750x multiple users vnc server software configuration guide for the cisco 3750x

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This appendix describes how to manipulate the Catalyst X or X switch flash file system, how to copy configuration files, and how to archive upload and download software images to a Catalyst X or X switch or to a Catalyst X switch stack.

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Forgot em client startup password Subject-based addressing conventions define a simple, uniform namespace for messages and their destinations. Optional Save your entries in the configuration file. This information is communicated to other network servers through all dynamic routing protocols. Configure the console. If you use the system mtu bytes command on a Catalyst X or E member in a mixed hardware stack, the setting takes effect on the Fast Ethernet ports of Catalyst members.
Add new user mysql workbench When you copy a configuration file from the switch to a server by using FTP, the Cisco IOS software sends the first valid username in this list: The username specified in the copy command if a username is specified. For information on command-capable Switchsee the release notes. Monitoring Temperature The Switch monitors the temperature conditions and uses the temperature information to control the fans. Step 3. Note To use the archive copy-sw privileged EXEC command, you must have downloaded from a TFTP server the images for both the stack member switch being added and the stack master.
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Software configuration guide for the cisco 3750x Caution Means reader be careful. Download the images file from the RCP server to the switch and overwrite the current image. The number of invalid values. The Switch monitors the temperature conditions and uses the temperature information to control the fans. This example shows how to specify a remote username of netadmin1. If the Switch is the destination of the traceroute, it is displayed as the final destination in the traceroute output. Flow control is set to receive : off.
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The command history feature is particularly useful for recalling long or complex commands or entries, including access lists. You can customize this feature to suit your needs. By default, the switch records ten command lines in its history buffer. You can alter this number for a current terminal session or for all sessions on a particular line.

This procedure is optional. Changes the number of command lines that the switch records during the current terminal session in privileged EXEC mode. You can configure the size from 0 to To recall commands from the history buffer, perform one of the actions listed in this table. These actions are optional. Ctrl-P or use the up arrow key. Recalls commands in the history buffer, beginning with the most recent command.

Repeat the key sequence to recall successively older commands. Ctrl-N or use the down arrow key. Returns to more recent commands in the history buffer after recalling commands with Ctrl-P or the up arrow key. Repeat the key sequence to recall successively more recent commands. Lists the last several commands that you just entered in privileged EXEC mode. The number of commands that appear is controlled by the setting of the terminal history global configuration command and the history line configuration command.

The command history feature is automatically enabled. You can disable it for the current terminal session or for the command line. Although enhanced editing mode is automatically enabled, you can disable it and reenable it. Reenables the enhanced editing mode for the current terminal session in privileged EXEC mode. Disables the enhanced editing mode for the current terminal session in privileged EXEC mode.

The keystrokes help you to edit the command lines. These keystrokes are optional. Moves the cursor back one character. Moves the cursor forward one character. Moves the cursor to the beginning of the command line. Moves the cursor to the end of the command line. Transposes the character to the left of the cursor with the character located at the cursor.

Erases the character to the left of the cursor. Deletes the character at the cursor. Deletes all characters from the cursor to the end of the command line. Deletes all characters from the cursor to the beginning of the command line. Deletes the word to the left of the cursor. Deletes from the cursor to the end of the word.

Changes the word at the cursor to lowercase. Capitalizes letters from the cursor to the end of the word. Designates a particular keystroke as an executable command, perhaps as a shortcut. Scrolls down a line or screen on displays that are longer than the terminal screen can display.

The More prompt is used for any output that has more lines than can be displayed on the terminal screen, including show command output. You can use the Return and Space bar keystrokes whenever you see the More prompt. Redisplays the current command line if the switch suddenly sends a message to your screen. You can use a wraparound feature for commands that extend beyond a single line on the screen.

When the cursor reaches the right margin, the command line shifts ten spaces to the left. You cannot see the first ten characters of the line, but you can scroll back and check the syntax at the beginning of the command. The keystroke actions are optional. To scroll back to the beginning of the command entry, press Ctrl-B or the left arrow key repeatedly. You can also press Ctrl-A to immediately move to the beginning of the line. The following example shows how to wrap a command line that extends beyond a single line on the screen.

Displays the global configuration command entry that extends beyond one line. When the cursor first reaches the end of the line, the line is shifted ten spaces to the left and redisplayed. Each time the cursor reaches the end of the line, the line is again shifted ten spaces to the left. The software assumes that you have a terminal screen that is 80 columns wide.

If you have a different width, use the terminal width privileged EXEC command to set the width of your terminal. Use line wrapping with the command history feature to recall and modify previous complex command entries. You can search and filter the output for show and more commands. This is useful when you need to sort through large amounts of output or if you want to exclude output that you do not need to see.

Using these commands is optional. Expressions are case sensitive. For example, if you enter exclude output , the lines that contain output are not displayed, but the lines that contain output appear. Before you can access the CLI, you must connect a terminal or a PC to the switch console or connect a PC to the Ethernet management port and then power on the switch , as described in the hardware installation guide that shipped with your switch.

If your switch is already configured, you can access the CLI through a local console connection or through a remote Telnet session, but your switch must first be configured for this type of access. You can use one of these methods to establish a connection with the switch :.

Connect the switch console port to a management station or dial-up modem , or connect the Ethernet management port to a PC. For information about connecting to the console or Ethernet management port , see the switch hardware installation guide. The switch must have network connectivity with the Telnet or SSH client, and the switch must have an enable secret password configured.

The switch supports up to 16 simultaneous Telnet sessions. Changes made by one Telnet user are reflected in all other Telnet sessions. The switch supports up to five simultaneous secure SSH sessions. After you connect through the console port, through the Ethernet management port, through a Telnet session or through an SSH session, the user EXEC prompt appears on the management station.

Skip to content Skip to search Skip to footer. Book Contents Book Contents. Find Matches in This Book. Log in to Save Content. PDF - Complete Book Updated: November 7, Chapter: Using the Command-Line Interface. The examples in the table use the hostname Switch Table 1.

Use this mode to Change terminal settings. Perform basic tests. Display system information. Switch Enter disable to exit. VLAN configuration While in global configuration mode, enter the vlan vlan-id command. Switch config-vlan To exit to global configuration mode, enter the exit command.

Interface configuration While in global configuration mode, enter the interface command with a specific interface. Switch config-if To exit to global configuration mode, enter exit. Line configuration While in global configuration mode, specify a line with the line vty or line console command.

Switch config-line To exit to global configuration mode, enter exit. Understanding Abbreviated Commands You need to enter only enough characters for the switch to recognize the command as unique. This example shows how to enter the show configuration privileged EXEC command in an abbreviated form: Switch show conf No and Default Forms of Commands Almost every configuration command also has a no form.

Table 2. The possible keywords that you can enter with the command appear. You did not enter all of the keywords or values required by this command. You entered the command incorrectly. Configuration Logging You can log and view changes to the switch configuration. Using the Help System You can enter a question mark? Procedure Command or Action Purpose Step 1 help Example: Switch help Obtains a brief description of the help system in any command mode.

Step 2 abbreviated-command-entry? Example: Switch di? Step 4? Step 5 command? Step 6 command keyword? Example: Switch config cdp holdtime? Procedure Command or Action Purpose terminal history [ size number-of-lines ] Example: Switch terminal history size Changes the number of command lines that the switch records during the current terminal session in privileged EXEC mode.

Recalling Commands To recall commands from the history buffer, perform one of the actions listed in this table. Procedure Command or Action Purpose Step 1 Ctrl-P or use the up arrow key Recalls commands in the history buffer, beginning with the most recent command. Step 2 Ctrl-N or use the down arrow key Returns to more recent commands in the history buffer after recalling commands with Ctrl-P or the up arrow key.

Disabling the Command History Feature The command history feature is automatically enabled. Enabling and Disabling Editing Features Although enhanced editing mode is automatically enabled, you can disable it and reenable it. Step 2 terminal no editing Example: Switch terminal no editing Disables the enhanced editing mode for the current terminal session in privileged EXEC mode.

Table 3. Ctrl-F or use the right arrow key Moves the cursor forward one character. Ctrl-A Moves the cursor to the beginning of the command line. Ctrl-E Moves the cursor to the end of the command line. Esc B Moves the cursor back one word. Esc F Moves the cursor forward one word. Ctrl-T Transposes the character to the left of the cursor with the character located at the cursor. You can also configure the switch to boot from the USB flash drive. Configures the switch to boot from the USB flash device.

The image is the name of the bootable image. This example configures the switch to boot from the Catalyst X flash device. The image is the Catalyst X universal image. To disable booting from flash, enter the no form of the command. This is sample output from the show usb device command:. This is sample output from the show usb port command:. The switch supports these interface types:. To configure a physical interface port , specify the interface type, stack member number only Catalyst X switches , module number, and switch port number, and enter interface configuration mode.

You can use the switch port LEDs in Stack mode to identify the stack member number of a switch. You can identify physical interfaces by physically checking the interface location on the switch. You can also use the show privileged EXEC commands to display information about a specific interface or all the interfaces on the switch.

The remainder of this chapter primarily provides physical interface configuration procedures. These are examples of how to identify interfaces on a X switch:. If the switch has SFP modules, the port numbers continue consecutively. These general instructions apply to all interface configuration processes. Step 2 Enter the interface global configuration command. Identify the interface type, the switch number only on Catalyst X switches , and the number of the connector.

In this example, Gigabit Ethernet port 1 on switch 1 is selected:. Note You do not need to add a space between the interface type and the interface number. Step 3 Follow each interface command with the interface configuration commands that the interface requires. The commands that you enter define the protocols and applications that will run on the interface.

The commands are collected and applied to the interface when you enter another interface command or enter end to return to privileged EXEC mode. You can also configure a range of interfaces by using the interface range or interface range macro global configuration commands. Interfaces configured in a range must be the same type and must be configured with the same feature options. Enter the show interfaces privileged EXEC command to see a list of all interfaces on or configured for the switch.

A report is provided for each interface that the device supports or for the specified interface. You can use the interface range global configuration command to configure multiple interfaces with the same configuration parameters. When you enter the interface-range configuration mode, all command parameters that you enter are attributed to all interfaces within that range until you exit this mode.

To configure a range of interfaces with the same parameters, follow these steps beginning in privileged EXEC mode:. Specifies the range of interfaces VLANs or physical ports to be configured, and enter interface-range configuration mode. Use the normal configuration commands to apply the configuration parameters to all interfaces in the range.

Each command is executed as it is entered. Verifies the configuration of the interfaces in the range. When using the interface range global configuration command, note these guidelines:. Note When you use the interface range command with port channels, the first and last port-channel number must be active port channels.

This example shows how to use a comma to add different interface type strings to the range to enable Gigabit Ethernet ports 1 to 3 and Gigabit Ethernet ports 1 and 2 to receive flow-control pause frames:. If you enter multiple configuration commands while you are in interface-range mode, each command is executed as it is entered. The commands are not batched and executed after you exit interface-range mode. If you exit interface-range configuration mode while the commands are being executed, some commands might not be executed on all interfaces in the range.

Wait until the command prompt reappears before exiting interface-range configuration mode. You can create an interface range macro to automatically select a range of interfaces for configuration. Before you can use the macro keyword in the interface range macro global configuration command string, you must use the define interface-range global configuration command to define the macro. To define an interface range macro, follow these steps beginning in privileged EXEC mode:.

You can now use the normal configuration commands to apply the configuration to all interfaces in the defined macro. Shows the defined interface range macro configuration. When using the define interface-range global configuration command, note these guidelines:. Note When you use the interface ranges with port channels, the first and last port-channel number must be active port channels.

This example shows how to create a multiple-interface macro named macro1 :. The Ethernet management port, also referred to as the Fa0 or fastethernet0 port , is a Layer 3 host port to which you can connect a PC. You can use the Ethernet management port instead of the switch console port for network management.

Figure Connecting a Switch to a PC. In a stack with only Catalyst X or Catalyst E switches, all the Ethernet management ports on the stack members are connected to a hub to which the PC is connected. The active link is from the Ethernet management port on the active switch through the hub to the PC. If the active switch fails and a new active switch is elected, the active link is now from the Ethernet management port on the new active switch to the PC.

See Figure In a mixed switch stack with Catalyst switches, only the Catalyst E and Catalyst X stack members are connected to the PC through the Ethernet management ports. If the active switch fails and the elected active switch is not a Catalyst E or Catalyst X switch switch 2 , the active link can be from a stack member to the PC. By default, the Ethernet management port is enabled. The switch cannot route packets from the Ethernet management port to a network port, and the reverse.

Even though the Ethernet management port does not support routing, you might need to enable routing protocols on the port see Figure For example, in Figure , you must enable routing protocols on the Ethernet management port when the PC is multiple hops away from the switch and the packets must pass through multiple Layer 3 devices to reach the PC.

In Figure , if the Ethernet management port and the network ports are associated with the same routing process, the routes are propagated as follows:. Because routing is not supported between the Ethernet management port and the network ports, traffic between these ports cannot be sent or received.

If this happens, data packet loops occur between the ports, which disrupt the switch and network operation. To prevent the loops, configure route filters to avoid routes between the Ethernet management port and the network ports. The Ethernet management port supp orts these features:. To specify the Ethernet management port in the CLI, enter fastethernet0. To disable the port, use the shutdown interface configuration command.

To enable the port, use the no shutdown interface configuration command. To display the link status, use the show interfaces fastethernet 0 privileged EXEC command. Use the commands in Table when using TFTP to download or upload a configuration file to the boot loader. Table Boot Loader Commands. Clears the statistics for the Ethernet management port. Displays the statistics for the Ethernet management port.

Loads and boots an executable image from the TFTP server and enters the command-line interface. For more details, see the command reference for this release. These sections contain this configuration information:. Table shows the Ethernet interface default configuration, including some features that apply only to Layer 2 interfaces.

Note To configure Layer 2 parameters, if the interface is in Layer 3 mode, you must enter the switchport interface configuration command without any parameters to put the interface into Layer 2 mode. This shuts down the interface and then reenables it, which might generate messages on the device to which the interface is connected. When you put an interface that is in Layer 3 mode into Layer 2 mode, the previous configuration information related to the affected interface might be lost, and the interface is returned to its default configuration.

Layer 2 or switching mode switchport command. Switchport mode dynamic auto supports DTP Layer 2 interfaces only. Not supported on the Gigabit interfaces. Flow control is set to receive : off. It is always off for sent packets. Disabled on all Ethernet ports. Port blocking unknown multicast and unknown unicast traffic. Disabled not blocked Layer 2 interfaces only. Disabled Layer 2 interfaces only. This is regardless of whether auto-MIDX is enabled on the switch port. In full-duplex mode, two stations can send and receive traffic at the same time.

These sections describe how to configure the interface speed and duplex mode:. When configuring an interface speed and duplex mode, note these guidelines:. Duplex options are not supported. For information about which SFP modules are supported on your switch, see the product release notes.

To set the speed and duplex mode for a physical interface, follow these steps beginning in privileged EXEC mode:. Specifies the physical interface to be configured, and enter interface configuration mode. This command is not available on a Gigabit Ethernet interface. Enters the appropriate speed parameter for the interface:.

You can configure the duplex setting when the speed is set to auto. Displays the interface speed and duplex mode configuration. Use the no speed and no duplex interface configuration commands to return the interface to the default speed and duplex settings autonegotiate. To return all interface settings to the defaults, use the default interface interface-id interface configuration command.

Flow control enables connected Ethernet ports to control traffic rates during congestion by allowing congested nodes to pause link operation at the other end. If one port experiences congestion and cannot receive any more traffic, it notifies the other port by sending a pause frame to stop sending until the condition clears.

Upon receipt of a pause frame, the sending device stops sending any data packets, which prevents any loss of data packets during the congestion period. Note Catalyst X or X ports can receive, but not send, pause frames. The default state is off. When set to desired , an interface can operate with an attached device that is required to send flow-control packets or with an attached device that is not required to but can send flow-control packets.

These rules apply to flow control settings on the device:. Note For details on the command settings and the resulting flow control resolution on local and remote ports, see the flowcontrol interface configuration command in the command reference for this release. To configure flow control on an interface , follow these steps beginning in privileged EXEC mode:.

Specify the physical interface to be configured, and enter interface configuration mode. To disable flow control, use the flowcontrol receive off interface configuration command. This example shows how to turn on flow control on a port:. When automatic medium-dependent interface crossover auto-MDIX is enabled on an interface, the interface automatically detects the required cable connection type straight through or crossover and configures the connection appropriately.

When connecting switches without the auto-MDIX feature, you must use straight-through cables to connect to devices such as servers, workstations, or routers and crossover cables to connect to other switches or repeaters. With auto-MDIX enabled, you can use either type of cable to connect to other devices, and the interface automatically corrects for any incorrect cabling.

For more information about cabling requirements, see the hardware installation guide. Auto-MDIX is enabled by default. Table shows the link states that result from auto-MDIX settings and correct and incorrect cabling. Configures the interface to autonegotiate speed with the connected device. Configures the interface to autonegotiate duplex mode with the connected device. Verifies the operational state of the auto-MDIX feature on the interface.

To disable auto-MDIX, use the no mdix auto interface configuration command. This example shows how to enable auto-MDIX on a port:. For most situations, the default configuration auto mode works well, providing plug-and-play operation. No further configuration is required. However, use the following procedure to give a PoE port higher priority, to make it data only, or to specify a maximum wattage to disallow high-power powered devices on a port. Catalyst X switches also support StackPower, which allows switch power supplies to share the load across multiple systems in a stack by connecting up to four switches with power stack cables.

Note When you make PoE configuration changes, the port being configured drops power. Depending on the new configuration, the state of the other PoE ports, and the state of the power budget, the port might not be powered up again. For example, port 1 is in the auto and on state, and you configure it for static mode. The switch removes power from port 1, detects the powered device, and repowers the port. If port 1 is in the auto and on state and you configure it with a maximum wattage of 10 W, the switch removes power from the port and then redetects the powered device.

The switch repowers the port only if the powered device is a class 1, class 2, or a Cisco-only powered device. Specifies the physical port to be configured, and enter interface configuration mode. Configures the PoE mode on the port. The keywords have these meanings:.

Note If a port has a Cisco powered device connected to it, do not use the power inline never command to configure the port. A false linkup can occur, placing the port into the error-disabled state. The switch allocates power to a port configured in static mode before it allocates power to a port configured in auto mode. Displays PoE status for a switch or a switch stack for the specified interface or for a specified stack member.

The module switch-number keywords are supported only on Catalyst X switches. For information about the output of the show power inline user EXEC command, see the command reference for this release. This does not apply to IEEE third-party powered devices. For these devices, when the switch grants a power request, the switch adjusts the power budget according to the powered-device IEEE classification. If the powered device is a class 0 class status unknown or a class 3, the switch budgets 15, mW for the device, regardless of the CDP-specific amount of power needed.

If the powered device reports a higher class than its CDP-specific consumption or does not support power classification defaults to class 0 , the switch can power fewer devices because it uses the IEEE class information to track the global power budget. By using the power inline consumption wattage interface configuration command or the power inline consumption default wattage global configuration command, you can override the default power requirement specified by the IEEE classification.

The difference between what is mandated by the IEEE classification and what is actually needed by the device is reclaimed into the global power budget for use by additional devices. You can then extend the switch power budget and use it more effectively. Note When you manually configure the power budget, you must also consider the power loss over the cable between the switch and the powered device.

When you enter the power inline consumption default wattage or the no power inline consumption default global configuration command or the power inline consumption wattage or the no power inline consumption interface configuration command, this caution message appears:. To configure the amount of power budgeted to a powered device connected to each PoE port on a switch, follow these steps beginning in privileged EXEC mode:.

Configures the power consumption of powered devices connected to each the PoE port on the switch. The range for each device is to mW. The default is mW. Note When you use this command, we recommend you also enable power policing. To return to the default setting, use the no power inline consumption default global configuration command. To configure amount of power budgeted to a powered device connected to a specific PoE port, follow these steps beginning in privileged EXEC mode:.

Configures the power consumption of a powered device connected to a PoE port on the switch. To return to the default setting, use the no power inline consumption interface configuration command. For information about the output of the show power inline consumption privileged EXEC command, see the command reference for this release. By default, the switch monitors the real-time power consumption of connected powered devices.

You can configure the switch to police the power usage. By default, policing is disabled. To enable policing of the real-time power consumption of a powered device connected to a PoE port, follow these steps beginning in privileged EXEC mode:. If the real-time power consumption exceeds the maximum power allocation on the port, configure the switch to take one of these actions:. Note You can enable error detection for the PoE error-disabled cause by using the errdisable detect cause inline-power global configuration command.

You can also enable the timer to recover from the PoE error-disabled state by using the errdisable recovery cause inline-power interval interval global configuration command. If you do not enter the action log keywords, the default action shuts down the port and puts the port in the error-disabled state. Optional Enables error recovery from the PoE error-disabled state, and configures the PoE recover mechanism variables.

For interval interval , specify the time in seconds to recover from the error-disabled state. The range is 30 to Displays the power monitoring status, and verify the error recovery settings. To disable policing of the real-time power consumption, use the no power inline police interface configuration command. To disable error recovery for PoE error-disabled cause, use the no errdisable recovery cause inline-power global configuration command. For information about the output from the show power inline police privileged EXEC command, see the command reference for this release.

You can add a description about an interface to help you remember its function. The description appears in the output of these privileged EXEC commands: show configuration , show running-config , and show interfaces. To add a description for an interface, follow these steps beginning in privileged EXEC mode:.

Specifies the interface for which you are adding a description, and enter interface configuration mode. Adds a description up to characters for an interface. Use the no description interface configuration command to delete the description. This example shows how to add a description on a port and how to verify the description:. The switch supports these types of Layer 3 interfaces:. There is no defined limit to the number of SVIs and routed ports that can be configured in a switch or in a switch stack.

However, the interrelationship between the number of SVIs and routed ports and the number of other features being configured might have an impact on CPU usage because of hardware limitations. If the switch is using its maximum hardware resources, attempts to create a routed port or SVI have these results:.

All Layer 3 interfaces require an IP address to route traffic. This procedure shows how to configure an interface as a Layer 3 interface and how to assign an IP address to an interface. Note If the physical port is in Layer 2 mode the default , you must enter the no switc hport interface configuration command to put the interface into Layer 3 mode. Entering a no switchport command disables and then reenables the interface, which might generate messages on the device to which the interface is connected.

Furthermore, when you put an interface that is in Layer 2 mode into Layer 3 mode, the previous configuration information related to the affected interface might be lost, and the interface is returned to its default configuration. Specifies the interface to be configured as a Layer 3 interface, and enter interface configuration mode. To remove an IP address from an interface, use the no ip address interface configuration command.

This example shows how to configure a port as a routed port and to assign it an IP address:. You can use this command to exclude the monitoring port status when determining the status of the SVI. Specifies a Layer 2 interface physical port or port channel , and enter interface configuration mode. Excludes the access or trunk port when defining the status of an SVI line state up or down. This example shows how to configure an access or trunk port in an SVI to be excluded from the line-state status calculation:.

The default maximum transmission unit MTU size for frames received and sent on all interfaces on the switch or switch stack is bytes. You can change the MTU size to support switched jumbo frames on all Gigabit Ethernet and Gigabit Ethernet interfaces and to support routed frames on all routed ports. When configuring the system MTU values, follow these guidelines:.

Note This command is not supported on switches running the LAN base feature set. Unlike the system MTU routing configuration, the MTU settings you enter with the system mtu and system mtu jumbo commands are not saved in the switch Cisco IOS configuration file, even if you enter the copy running-config startup-config privileged EXEC command. Therefore, if you use TFTP to configure a new switch by using a backup configuration file and want the system MTU to be other than the default, you must explicitly configure the system mtu and system mtu jumbo settings on the new switch and then reload the switch.

In a switch stack, the MTU values applied to the members depend on the stack configuration:. Table shows how the MTU values are applied depending on the configuration. Use the system mtu jumbo bytes command. Use the system mtu routing bytes command. The range is from to the system jumbo MTU value in bytes. Use the system mtu bytes command, which takes effect only on Catalyst members.

The range is from to the system MTU value in bytes. Use the system mtu bytes command. If you use the system mtu bytes command on a Catalyst X or E member in a mixed hardware stack, the setting takes effect on the Fast Ethernet ports of Catalyst members.

The system routing MTU value is the applied value, not the configured value. The upper limit of the system routing MTU value is based on the switch or switch stack configuration and refers to either the currently applied system MTU or the system jumbo MTU value. For more information about setting the MTU sizes, see the system mtu global configuration command in the command reference for this release. For information about the range for bytes , see Table Optional Changes the system MTU for routed ports.

The range is to bytes; the default is bytes. Note This command does not apply to Catalyst X switches. If you enter a value that is outside the allowed range for the specific type of interface, the value is not accepted. This example shows how to set the maximum packet size for a Gigabit Ethernet port to bytes:. This example shows the response when you try to set Gigabit Ethernet interfaces to an out-of-range number:. You can use the power supply user EXEC command to configure and manage the internal power supplies on the switch.

To configure and manage the internal power supplies, follow these steps beginning in user EXEC mode:. Specifies a switch to reset or a power supply to set to off or on. By default, the switch power supply is on. Note Power supply slot B slot is the closest to the outer edge of the switch. The switch-number is supported only on Catalyst X switches. The switch does not support the no power supply user EXEC command.

For more information about using the power supply user EXEC command, see the command reference for this release. These switches can be connected to an XPS expandable power supply not available at this time. The Catalyst X switch also has stack power connectors. Follow these guidelines when configuring the RSP If multiple switches connected to the RPS need power, the RPS provides power to the switches with the highest priority. If the RPS still has power available, it can then provide power to the switches with lower priorities.

Using quotation marks before and after the name is optional, but you must use quotation marks if you want to include spaces in the port name. The name can have up to 16 characters. The default mode for RPS ports is active. Sets the priority of the RPS port. The range is from 1 to 6, where 1 is the highest priority and 6 is the lowest priority.

To return to the RPS default settings, use these commands:. For more information about using the power rps user EXEC command, see the command reference for this release. The Cisco XPS is a standalone power system that you can connect to Catalyst X and Catalyst X switches to provide backup power to connected devices or, in a Catalyst X power stack, to supply additional power to the power stack budget.

The switch-number appears only on Catalyst X switches and represents the switch number in the data stack, a value from 1 to 9. Configures a name for an XPS port connected to the switch. Verifies the configured name of the system and ports. Use the no power xps switch-number name command to remove the system name. Use the no power xps switch-number port command to remove the port name.

These commands apply to the XPS and are saved in the XPS, but the configuration is not saved in the switch configuration file. Note Disabling an XPS port is like removing the cable and appears the same in the show command outputs. If the physical cable is connected, you can still use the enable keyword to enable the port. Sets the RPS priority of the port, where higher priority ports take precedence over low priority ports if multiple power supplies fail.

This command takes effect only when the port mode is RPS. When the port mode is stack power, you set priority by using the stack power commands. You can configure the mode of an XPS power supply and you can configure it to be on or off. To configure XPS power supplies. Follow these steps beginning in privileged EXEC mode:.

Sets the XPS power supply to be on or off. The default is for both power supplies to be on. These sections contain interface monitoring and maintenance information:. Commands entered at the privileged EXEC prompt display information about the interface, including the versions of the software and the hardware, the configuration, and statistics about the interfaces. Table lists some of these interface monitoring commands.

You can display the full list of show commands by using the show? Table Show Commands fo r Interfaces. Optional Displays the status of the internal power supplies for each switch in the stack or for the specified switch. The range is 1 to 9, depending on the switch member numbers in the stack.

These keywords are available only on Catalyst E switches. Displays whether a redundant power system RPS is connected to the switch as follows:. Optional Displays the details about the RPSs that are connected to the switch or switch stack. Optional Displays the RPSs that are connected to each switch in the stack or to the specified switch. Displays the status and configuration of all interfaces or a specific interface. Displays interface status or a list of interfaces in the error-disabled state.

Displays administrative and operational status of switching nonrouting ports. You can use this command to find out if a port is in routing or in switching mode. Displays the description configured on an interface or all interfaces and the interface status. Displays the usability status of all interfaces configured for IP routing or the specified interface. Displays the input and output packets by the switching path for the interface.

Optional Displays speed and duplex on the interface. Optional Displays temperature, voltage, or amount of current on the interface. Displays physical and operational status about an SFP module. Displays the running configuration in RAM for the interface. Displays the hardware configuration, software version, the names and sources of configuration files, and the boot images. Displays the operational state of the auto-MDIX feature on the interface. Displays PoE status for a switch or switch stack, for an interface, or for a specific switch in the stack.

Table lists the privileged EXEC mode clear commands that you can use to clear counters and reset interfaces. Table Clear Commands fo r Interfaces. Resets the hardware logic on an asynchronous serial line. The clear counters command clears all current interface counters from the interface unless you specify optional arguments that clear only a specific interface type from a specific interface number. Shutting down an interface disables all functions on the specified interface and marks the interface as unavailable on all monitoring command displays.

This information is communicated to other network servers through all dynamic routing protocols. The interface is not mentioned in any routing updates. To shut down an interface, follow these steps beginning in privileged EXEC mode:. Use the no shutdown interface configuration command to restart the interface. To verify that an interface is disabled, enter the show interfaces privileged EXEC command. A disabled interface is shown as administratively down in the display.

Skip to content Skip to search Skip to footer. Book Contents Book Contents. Find Matches in This Book. Log in to Save Content. PDF - Complete Book Updated: September 11, Chapter: Configuring Interface Characteristics. Configuring Interface Characteristics.

Interface Types This section describes the different types of interfaces supported by the switch with references to chapters that contain more detailed information about configuring these interface types. Add ports to a VLAN by using the switchport interface configuration commands: Identify the interface. For a trunk port, set trunk characteristics, and, if desired, define the VLANs to which it can belong.

For an access port, set and define the VLAN to which it belongs. Switch Ports Switch ports are Layer 2-only interfaces associated with a physical port. VLAN membership of dynamic access ports is learned through incoming packets. By default, a dynamic access port is not a member of any VLAN, and forwarding to and from the port is enabled only when the VLAN membership of the port is discovered.

These trunk port types are supported: In an ISL trunk port, all received packets are expected to be encapsulated with an ISL header, and all transmitted packets are sent with an ISL header. Native non-tagged frames received from an ISL trunk port are dropped. An IEEE All other traffic is sent with a VLAN tag. Routed Ports A routed port is a physical port that acts like a port on a router; it does not have to be connected to a router.

The VLAN interface exists and is not administratively down. EtherChannel Port Groups EtherChannel port groups consider multiple switch ports to be one switch port. Supported Protocols and Standards The switch uses these protocols and standards to support PoE: CDP with power consumption —The powered device notifies the switch of the amount of power it is consuming. The switch does not reply to the power-consumption messages. The switch can only supply power to or remove power from the PoE port.

Cisco intelligent power management —The powered device and the switch negotiate through power-negotiation CDP messages for an agreed-upon power-consumption level. The negotiation allows a high-power Cisco powered device, which consumes more than 7 W, to operate at its highest power mode. The powered device first boots up in low-power mode, consumes less than 7 W, and negotiates to obtain enough power to operate in high-power mode. The device changes to high-power mode only when it receives confirmation from the switch.

IEEE For more information, see the standard. After device detection, the switch determines the device power requirements based on its type: A Cisco prestandard powered device does not provide its power requirement when the switch detects it, so the switch allocates The switch classifies the detected IEEE device within a power consumption class.

Based on the available power in the power budget, the switch determines if a port can be powered. Table lists these levels. Maximum Power Level Required from the Switch. Power Management Modes The switch supports these PoE modes: auto —The switch automatically detects if the connected device requires power.

If the switch discovers a powered device connected to the port and if the switch has enough power, it grants power, updates the power budget, turns on power to the port on a first-come, first-served basis, and updates the LEDs. For LED information, see the hardware installation guide.

The switch allocates the port configured maximum wattage, and the amount is never adjusted through the IEEE class or by CDP messages from the powered device. Because power is pre-allocated, any powered device that uses less than or equal to the maximum wattage is guaranteed to be powered when it is connected to the static port.

The port no longer participates in the first-come, first-served model. Use this mode only when you want to make sure that power is never applied to a PoE-capable port, making the port a data-only port. Power Monitoring and Power Policing When policing of the real-time power consumption is enabled, the switch takes action when a powered device consumes more power than the maximum amount allocated, also referred to as the cutoff-power value.

The switch senses the real-time power consumption of the connected device as follows: 1. Manually when you set the user-defined power level that the switch budgets for the port by using the power inline consumption default wattage global or interface configuration command 2. Manually when you set the user-defined power level that limits the power allowed on the port by using the power inline auto max max-wattage or the power inline static max max-wattage interface configuration command 3.

Power Consumption Values You can configure the initial power allocation and the maximum power allocation on a port. If a power supply is removed and replaced by a new power supply with less power and the switch does not have enough power for the powered devices, the switch denies power to the PoE ports in auto mode in descending order of the port numbers. If the switch still does not have enough power, the switch then denies power to the PoE ports in static mode in descending order of the port numbers.

If the new power supply supports more power than the previous one and the switch now has more power available, the switch grants power to the PoE ports in static mode in ascending order of the port numbers.

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