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Avocent CCM1640, CCM840 Connecting to Serial Devices, Preemption, To display serial port settings:

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18CCM840/1640 Installer/User Guide

For more information and descriptions of all valid parameters, see Port Set command in Chapter 5.

To display serial port settings:

Issue a Show Port command.

SHOW PORT [<port>ALLNAMES]

When you request information about a port, the display includes configuration information, current power status (if power status monitoring has been enabled), plus transmit, receive and error counts. When you request information about a single port and a user is currently accessing that port, the display also includes the username, access rights and other information about the current session.

When you request information about port names, the display includes the port numbers and names. If a port’s name has not been changed with a Port Set command, the logical name is displayed.

For more information, see Show Port command in Chapter 5.

Connecting to Serial Devices

The CCM offers several methods for connecting to attached serial devices: Telnet, serial CLI, PPP and SSH.

Preemption

Depending on configured access levels, a user who is connecting to a port (the connecting user) may disconnect another user of equal or lower access (the current user).

If the connecting user’s access level is lower than the current user’s access level, the connecting user will receive an In Use message and the connection will be dropped.

If the connecting user’s access level is equal to or higher than the owning user’s access level, an In Use by owning user message will be displayed. The connecting user may then choose to preempt the current user’s session. If the current user’s session is preempted, an appropriate message is displayed.

For more information about access levels, see Access rights and levels in this chapter.

Contents

Page Page Page Page Table of Contents Page 1 Product Overview Page Chapter 1: Product Overview Features and Benefits Safety Precautions Rack mount safety considerations Using AVWorks Page Installation and Configuration Page Chapter 2: Installation and Configuration Hardware Overview Installing the CCM Configuring the CCM Configuring the IP address and subnet mask To conﬁgure the IP address and subnet mask using a Telnet CLI: To conﬁgure the CCM using the serial CLI: Initial CCM login Reinitializing the CCM 3 Operations Page Chapter 3: Operations Overview Configuring Serial Port Settings Connecting to Serial Devices Connecting to devices using Telnet Connecting to devices from the serial CLI port Configuring and using dial-inconnections Connecting to devices using PPP Connecting to devices using SSH SSH Authentication Methods Page Enabling plain text Telnet and SSH connections Telnet CLI mode Ending device sessions Session time-outs Managing User Accounts To change a user’s conﬁguration information: To end another user’s CCM session: To delete a user: To display user conﬁguration information: Access rights and levels Using Authentication Modes Authentication summary Using Security Lock-out Managing the Port History Buffer Using port history mode commands Port History Mode Commands To access port history mode: To control the port history buffer display when you connect: To control the port history buffer content when you end a session: To clear and discard all data in a port history buffer: Managing the CCM Using SNMP To add or delete SNMP management entity addresses: To enable or disable SNMP traps: To add or delete SNMP trap destination addresses: To add, copy or delete port alert strings: To display SNMP conﬁguration information: To display port alert string information: 4 Using CCM Commands Page Chapter 4: Using CCM Commands Accessing the CLI Entering Commands When commands take effect Understanding Conventions Command syntax Page Syntax conventions Command Summary CCM Command Summary (Continued) Page Page Page 5 CCM Commands Page Chapter 5: CCM Commands Connect Command Disconnect Command Help Command Port Commands Port Alert Add command Port Alert Copy command Port Alert Delete command Port Break command Port History command Port Logout command Port Set command Page Quit Command Resume Command Server Commands Server CLI command Server FLASH command Server PPP command Server RADIUS command Server Reboot command Server Security command Server Set command Server SNMP command Server SNMP Community command Server SNMP Manager command Server SNMP Trap command Server SNMP Trap Destination command Server SSH command Show Commands Show Port command Page Show Port Alert command Show Server command Show Server CLI command Show Server PPP command Show Server RADIUS command Show Server Security command Show Server SNMP command Show User command SPC Command User Commands User Add command Page User Delete command User Logout command User Set command User Unlock command Page Appendices Page Appendices Appendix A: Technical Specifications Appendix B: Device Cabling Page RJ-45modular adaptors and cables Page Appendix C: Ports Used Appendix D: Technical Support