You can manage and maintain a switch remotely by Telnetting to the switch. To log in to a switch through Telnet, the corresponding configuration is required on both the switch and the Telnet terminal.
You can also log in to a switch through SSH. SSH is a secure shell added to Telnet. Refer to the SSH Operation for related information. Table Requirements for Telnetting to a switch. Refer to the IP Address. The authentication mode and other settings are configured. Refer to Table Telnetting to a switch using IPv6 protocols is similar to Telnetting to a switch using IPv4 protocols.
Refer to the IPv6 Management part for related information. Table Common Telnet configuration. Table Telnet configurations for different authentication modes. Note that if you configure not to authenticate the users, the command level available to users logging in to a switch depends on the user privilege level level command.
Assume current user logins through the console port, and the current user level is set to the administrator level level 3. Perform the following configurations for users logging in through VTY 0 using Telnet.
The history command buffer can contain up to 20 commands. The timeout time of VTY 0 is 6 minutes. Figure Network diagram for Telnet configuration with the authentication mode being none. Follow these steps to configure Telnet with the authentication mode being password:. When the authentication mode is password, the command level available to users logging in to the user interface is determined by the user privilege level command.
Assume current user logins through the console port and the current user level is set to the administrator level level 3. Perform the following configurations for users logging in to VTY 0 using Telnet. Figure Network diagram for Telnet configuration with the authentication mode being password. Follow these steps to configure Telnet with the authentication mode being scheme:. If you configure to authenticate the users in the scheme mode, the command level available to the users logging in to the switch depends on the user level defined in the AAA scheme.
Assume current user logins through the console port and the user level is set to the administrator level level 3. Set the authentication password of the local user to in plain text. Set the service type of VTY users to Telnet and the command level to 2. Configure to authenticate users logging in to VTY 0 in scheme mode. Only Telnet protocol is supported in VTY 0. Figure Network diagram for Telnet configuration with the authentication mode being scheme. Create a local user named guest and enter local user view.
Set the service type to Telnet, Specify commands of level 2 are available to users logging in to VTY The prompt appears. Figure Network diagram for Telnet connection establishment. Figure Launch Telnet. A 3Com switch can accommodate up to five Telnet connections at same time.
You can also type? Refer to the relevant parts in this manual for the information about the commands. Refer to the CLI part for information about command hierarchy.
You can Telnet to another switch from the current switch. In this case, the current switch operates as the client, and the other operates as the server. If the interconnected Ethernet ports of the two switches are in the same LAN segment, make sure the IP addresses of the two management VLAN interfaces to which the two Ethernet ports belong to are of the same network segment, or the route between the two VLAN interfaces is available.
As shown in Figure , after Telnetting to a switch labeled as Telnet client , you can Telnet to another switch labeled as Telnet server by executing the telnet command and then configure it. Figure Network diagram for Telnetting to another switch from the current switch. Note that xxxx is the IP address or the host name of the switch operating as the Telnet server. You can use the ip host to assign a host name to a switch. Refer to the following chapters for the information about the commands.
The administrator can log in to the console port of a remote switch using a modem through public switched telephone network PSTN if the remote switch is connected to the PSTN through a modem to configure and maintain the switch remotely.
When a network operates improperly or is inaccessible, you can manage switches in the network remotely in this way. To log in to a switch in this way, you need to configure the administrator side and the switch properly, as listed in the following table. Table Requirements for logging in to a switch using a modem. Perform the following configuration on the modem directly connected to the switch:. The configuration commands and the output of different modems may differ.
Refer to the user manual of the modem when performing the above configuration. After logging in to a switch through its console port by using a modem, you will enter the AUX user interface. The corresponding configuration on the switch is the same as those when logging in to the switch locally through its console port except that:.
Otherwise, packets may get lost. The configuration on the switch depends on the authentication mode the user is in. Refer to Table for the information about authentication mode configuration. Refer to Modem Configuration for related configuration. Make sure the modems are properly connected to telephone lines. Figure Establish the connection by using modems. Note that you need to set the telephone number to that of the modem directly connected to the switch.
Figure Set the telephone number. Figure Call the modem. You can then configure or manage the switch. You can also enter the character? Refer to the related parts in this manual for information about the configuration commands. If you perform no AUX user-related configuration on the switch, the commands of level 3 are available to modem users. Refer to the CLI part for information about command level. When configuring CLI, go to these sections for information you are interested in:. A command line interface CLI is a user interface to interact with a switch.
Through the CLI on a switch, a user can enter commands to configure the switch and check output information to verify the configuration. Each 3com switch provides an easy-to-use CLI and a set of configuration commands for the convenience of the user to configure and manage the switch. The CLI on the 3com switch provides the following features, and so has good manageability and operability. This prevents users from using unauthorized commands to configure switches. This allows users to execute a command by entering partially-spelled command keywords as long as the keywords entered can be uniquely identified by the system.
All the commands and login users are categorized into four levels, which are visit, monitor, system, and manage from low to high, and identified respectively by 0 through 3. After users at different privilege levels log in, they can only use commands at their own, or lower, levels. For example, level 2 users can only use level 0 through level 2 commands, not level 3 commands. Based on user privilege, commands are classified into four levels, which default to:.
For example, ping , tracert and telnet are level 0 commands. Such commands include debugging and terminal. Commands concerning routing and network layers are at this level. These commands can be used to provide network services directly. These commands provide support for services. By using the command-privilege level command, the administrator can change the level of a command in a specific view as required.
For details, refer to Modifying the Command Level. Users logged into the switch fall into four user privilege levels, which correspond to the four command levels respectively.
Users at a specific level can only use the commands at the same level or lower levels. By default, the Console user a user who logs into the switch through the Console port is a level-3 user and can use commands of level 0 through level 3, while Telnet users are level-0 users and can only use commands of level 0.
You can use the user privilege level command to set the default user privilege level for users logging in through a certain user interface. For details, refer to AAA Operation. Users can switch their user privilege level temporarily without logging out and disconnecting the current connection; after the switch, users can continue to configure the device without the need of relogin and reauthentication, but the commands that they can execute have changed.
For details, refer to Switching User Level. All the commands in a view are defaulted to different levels, as shown in Command level. Otherwise, your configuration will not take effect.
The values of the arguments should be within the specified ranges. The network administrator a level 3 user wants to change some TFTP commands such as tftp get from level 3 to level 0, so that general Telnet users level 0 users are able to download files through TFTP. Change the tftp get command in user view shell from level 3 to level 0. Originally, only level 3 users can change the level of a command.
After the above configuration, general Telnet users can use the tftp get command to download file bootrom. For example, if the current user privilege level is 3, the user can configure system parameters; after switching the user privilege level to 0, the user can only execute some simple commands, like ping and tracert , and only a few display commands.
The switching of user privilege level is temporary, and effective for the current login; after the user relogs in, the user privilege restores to the original level. To avoid misoperations, the administrators are recommended to log in to the device by using a lower privilege level and view device operating parameters, and when they have to maintain the device, they can switch to a higher level temporarily; when the administrators need to leave for a while or ask someone else to manage the device temporarily, they can switch to a lower privilege level before they leave to restrict the operation by others.
The high-to-low user level switching is unlimited. However, the low-to-high user level switching requires the corresponding authentication. With the super password set, you can pass the super password authentication successfully only when you provide the super password as prompted.
In this case, you cannot pass the super password authentication. For example, after the administrator configures the super password level 3 simple command, when users of level 0 through level 2 want to switch to user level 3, they need to input super password The following table lists the operations to configure super password authentication for user level switching, which can only be performed by level-3 users administrators.
The super password is for level switching only and is different from the login password. You will remain at the original user level if you have tried three times but failed to enter the correct authentication information.
Now, the network administrator wants to allow general users to switch to level 3, so that they are able to configure the switch. A VTY 0 user telnets to the switch, and then uses the set password to switch to user level 3. User privilege level is 3, and only those commands can be used whose level is equal or less than this. User privilege level is 0, and only those commands can be used whose level is equal or less than this. CLI views are designed for different configuration tasks.
They are both correlated and distinguishing. For example, once a user logs into a switch successfully, the user enters user view, where the user can perform some simple operations such as checking the operation status and statistics information of the switch.
After executing the system-view command, the user enters system view, where the user can go to other views by entering corresponding commands. Table lists the CLI views provided by the 3com switch , operations that can be performed in different CLI views and the commands used to enter specific CLI views. When configuring the switch, you can use the online help to get related help information. The CLI provides two types of online help: complete and partial. All the commands beginning with.
All the keywords. For example:. If there is a unique keyword beginning with the characters just typed, the unique keyword is displayed in its complete form. The CLI provides the screen splitting feature to have display output suspended when the screen is full.
When display output pauses, you can perform the following operations as needed see Table Table Display-related operations. The CLI provides the command history function. You can use the display history-command command to view a specific number of latest executed commands and execute them again in a convenient way.
By default, the CLI can store up to 10 latest executed commands for each user. You can view the command history by performing the operations listed in the following table:.
If a command passes the syntax check, it will be successfully executed; otherwise, an error message will be displayed. Table lists the common error messages. Table Common error messages. The CLI provides basic command edit functions and supports multi-line editing. The maximum number of characters a command can contain is Table lists the CLI edit operations. Table Edit operations. Switch has a Web server built in.
It enables you to log in to Switch through a Web browser and then manage and maintain the switch intuitively by interacting with the built-in Web server. To log in to Switch through the built-in Web-based network management interface, you need to perform the related configuration on both the switch and the PC operating as the network management terminal. Welcome to ManualMachine. We have sent a verification link to to complete your registration.
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Enter a new password. To uphold our policy, we are committed to: Establishing environmental performance standards that comply with national legislation and regulations. Ensuring that all products can be recycled, reused and disposed of safely. End of Life Statement 3Com processes allow for the recovery, reclamation and safe disposal of all end-of-life electronic components. Regulated Materials Statement 3Com products do not contain any hazardous or ozone-depleting material. Environmental Statement about the Documentation.
One is selected. One or none is selected. A minimum of one or a maximum of all can be selected. Many or none can be selected. A line starting with the sign is comments.
Logging In to an Ethernet Switch To manage or configure a Switch , you can log in to it in one of the following three methods:.
Relationship Between a User and a User Interface You can monitor and manage users logging in through different modes by setting different types of user interfaces. User Interface Index Two kinds of user interface index exist: absolute user interface index and relative user interface index. Common User Interface Configuration Follow these steps to configure common user interface: To do… Use the command… Remarks Optional Lock the current user lock Available in user view interface A user interface is not locked by default.
That is, information displaying the copy right information is displayed on the terminal after a user logs in successfully. Introduction To log in through the console port is the most common way to log in to a switch. Table The default settings of a console port Setting Default Baud rate 19, bps Flow control None Check mode Parity None Stop bits 1 Data bits 8 To log in to a switch through the console port, make sure the settings of both the console port and the user terminal are the same.
Figure Diagram for connecting to the console port of a switch To do… Use the command… Remarks Optional By default, the screen can contain up Set the maximum number of screen-length to 24 lines. Optional Set the history command history-command The default history command buffer size is 10, that is, a history command buffer size max-size value buffer of a user can store up to 10 commands by default. Optional The default timeout time of a user interface is 10 minutes.
With the timeout time being 10 Set the timeout time for the idle-timeout minutes minutes, the connection to a user interface is terminated if no operation user interface [ seconds ] is performed in the user interface within 10 minutes. You can use the idle-timeout 0 command to disable the timeout function.
Set the authentication mode to scheme Specify to perform local authentication or Refer to Console Port Scheme remote authentication Login Configuration with Authentication Mode Set user names and passwords locally or on Being Scheme. AAA Server To do… Use the command… Remarks Enter system view system-view — Enter AUX user interface user-interface aux 0 — view Required Configure to authenticate authentication-mode By default, users logging in to a switch through the console port are not users using the local password authenticated; while those logging in password through Modems or Telnet are authenticated.
Authenticate the users using passwords. Quit to system view quit — Introduction Switch supports Telnet. Refer to Table and Table Redundant Power the recommended circuit breaker and cable rating for the Switch System The recommended cable length should not exceed three metres 9. Figure 17 shows how to connect the power supply to the RPS socket in the back of the switch.
Use the cable tie supplied with your switch to support the cable in the back of the RPS connector as shown in Figure Use the earthing cable that accompanies your switch if the length is suitable. Alternatively use the earthing cable specification as defined in Appendix C on page The same cable connects the device to the network. Power over Ethernet is a self-configuring protocol. When you plug a PoE compliant device into one of the ports on the switch, the switch supplies the power required to the device, providing that the total power budget for the switch is not exceeded.
A PoE switch combines the functionality of a standard Ethernet switch with a single power supply that can power multiple devices. Using a PoE switch has the following advantages over an non-powered network. If, for example, you use the switch to connect a 3Com 11 Mbps Wireless LAN Access Point to the network, then only a network cable is required to provide both power and network connectivity.
You can fit the switch with a redundant power supply or uninterruptible power supply to increase its uptime. The switch supports resistor detection according to IEEE The Switch supports 3Com Power over Ethernet management is available using the web interface or the command line interface CLI.
To install the Module power module:. Slide it gently along the power slot. Push the module until it is fully seated. Pull out the module stably towards you along the power slot until it is completely apart from the chassis bottom.
CAUTION: When you use the Phillips screwdriver or power screwdriver to fasten captive screws on both sides of the module, make sure the captive force moment is not larger than 0. Placing Units On If the switch units are free-standing, you can stack up to eight units. If Top of Each Other you are mixing a variety of switches, make sure to place the smaller units. If you are stacking switch units, apply the supplied self-adhesive rubber feet to the underside of each switch.
Stick one in the marked area at each corner. Place the switch units on top of each other, ensuring that the feet of the upper unit sit fully on the lower unit. Powering-up the To power-up the switch:. These ports can automatically detect whether to. If auto-negotiation is disabled, all the switch ports are configured as MDIX cross-over. If you want to make a connection to another MDIX port, you need a cross-over cable.
Many ports on workstations and servers are configured as MDI straight-through. If you want to make a connection to an MDI port, you need to use a standard straight-through cable. See Table The maximum segment length for this type of cable is m ft.
Table 18 Cables required to connect the switch to other devices with auto-negotiation disabled. You can create a grounded port by connecting all wires at one end of a UTP cable to an earth ground point, and the other end to a female RJ connector located, for example, on a switch rack or patch panel. The RJ connector is now a grounded port. Use these ports for Ethernet wiring within the same building only.
Table 14 describes the port cable range for each connection. Table 20 describes the port cable range for each connection:. Welcome to ManualMachine. We have sent a verification link to to complete your registration. Log In Sign Up. Forgot password? Enter your email address and check your inbox.
Please check your email for further instructions. Enter a new password. Cisco is a registered trademark of Cisco Systems, Inc. To uphold our policy, we are committed to: Establishing environmental performance standards that comply with national legislation and regulations.
Conserving energy, materials and natural resources in all operations. Ensuring that all products can be recycled, reused and disposed of safely. Improving our environmental record on a continual basis. End of Life Statement 3Com processes allow for the recovery, reclamation and safe disposal of all end-of-life electronic components. Regulated Materials Statement 3Com products do not contain any hazardous or ozone-depleting material.
In the unlikely event of a hardware fault occurring, you can use the Unit LED to help diagnose the problem. Off No link is present. Duplex Green Full duplex, blinking off for every packet received or transmitted. Yellow Half duplex, blinking off for every packet received or transmitted. PoE Green Power is being delivered to the port. Green flashing Port power has exceeded limit or is unable to supply power due to unit being over budget.
Yellow PoE error, no power supplied on port. Yellow flashing The port has failed post. Off No power is being delivered. Yellow A low speed 10 Mbps link is present, blinking off for every packet received or transmitted. Off No links is present.
Open Book Warning Before installing or removing any components from the Switch Labels Family or carrying out any maintenance procedures, you must read the safety information provided in Appendix A of this guide. Rack-mounting 33 3 Insert the two screws and tighten them with a suitable screwdriver.
Figure 15 Fitting a front bracket for rack-mounting You must use the screws supplied with the securing brackets. You may need this information if you contact 3Com for Technical Support. Connecting a Redundant Power Supply 35 Figure 16 Fitting a rear rail bracket for rack-mounting 4 Insert the switch into the inch rack and secure it with suitable screws not provided.
Connecting the Earthing Cable. The earthing cable is only required if the switch is powered by the RPS only. The recommended cable length should not exceed three metres 9. Yellow The AC supply has failed or is not connected.
The RPS supply is connected. Off There is no RPS supply connected. The Power-up Sequence 45 Table 18 Cables required to connect the switch to other devices with auto-negotiation disabled Cross-over Cable Straight-through Cable.
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Upgrading from the Command Line Interface The Release Notes provide important information about the current. You should read the Release Notes before installing the Switch. If the information in the Release Notes differs from the information in this. Table 2 lists conventions that are used throughout this guide. Information that alerts you to potential personal injury. In addition to this guide, each Switch documentation set includes the. Accessing the Documentation 9.
These notes provide information about the current software release,. Release Notes are supplied in hard copy with your Switch. The Switch Family documentation is available in Adobe Acrobat. Your suggestions are very important to us. They will help make our. Please e-mail comments about this. Please include the following information when commenting:. Please note that we can only respond to comments and questions about.
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