System information

Switch Management
1-2
management only synchronizes the configuration file, including any configuration
updates, with the backup management.
• Upon the failure or “hot” removal of the master Management Module within a
stackable configuration, the following occurs:
- A “Trap” is sent, a “Log event” is logged, the switch is re-booted and the backup
Management Module takes over without loss of configuration settings.
- The fail-over time of master management to that of the backup management in
a medium-size stackable configuration is approximately 2 minutes.
Consequently network traffic is disrupted during the fail-over period.
- The backup management’s “Backup Master” state changes to a “Master” state
and the switch Unit IDs will also reflect the new change.
- All ports will still be active and the switch will continue forwarding traffic in a
normal operative manner.
- If a Management Module were to be re-installed, the newly-installed
Management Module would assume the role of “Master” agent with the
incumbent one changing status to that of “Backup Master” agent.
Closed-Loop Stack
Up to six OS-6124 switches can be stacked together by installing optional Stacking
Modules. The OS-6100-RST-KIT Redundant Stacking Module kit allows you to
configure a closed-loop architecture that provides fault-tolerant operation of the
stack. If a switch or Stacking Module fails, the operation and management of the
stack remains unaffected. This also allows a switch to be powered down and
removed from a stack without disrupting the rest of the stack.
Note: The Redundant Stacking Module must be installed with the master Management
Module in Unit 1 only. If backup management is used in conjunction with the
closed-loop feature, the backup Management Module must be installed in Unit 2.
Required Connections
Console Port (Out-of-Band) Connections
Attach a VT100 compatible terminal or a PC running a terminal emulation program
to the serial port on the switch’s rear panel. Use the null-modem cable provided with
this package, or use a null modem connection that complies with the wiring
assignments shown in Appendix B of this guide.
When attaching to a PC, set terminal emulation type to VT100, specify the port used
by your PC (i.e., COM 1~4), and then set communications to 8 data bits, 1 stop bit,
no parity, and 9600 bps (for initial configuration). Also be sure to set flow control to
“none.” (Refer to “Configuring the Serial Port” on page 2-14 for a complete
description of configuration options.)
Note: If the default settings for the management agent’s serial port have been
modified and you are having difficulty making a console connection, you can
display or modify the current settings using a Web browser as described under
“Console Configuration” on page 3-5.