Foundry FastIron SuperX, Руководство по установке оборудования

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FastIron Hardware Installation Guide for the FSX, FSX 800, and FSX 1600
6 - 2 © 2008 Foundry Networks, Inc. December 2008
After the modules boot, the active module synchronizes the standby module’s flash code and system-config file
with its own.
During normal operation, the active module handles tasks such as obtaining network topology and reachability
information and determining the best paths to known destinations. The active module also monitors the standby
module.
The standby module functions in an active standby mode. Keeping the system-config and running-config files on
both modules synchronized allows the standby module to assume the role of active module seamlessly if
necessary.
During a switchover, the standby management module takes over the active role and re-initializes all the interface
modules in the system that are not CLI-disabled by the administrator. This may cause a brief interruption of the
traffic forwarding.
Management Module Switchover
The following events cause the standby management module to become the active module, which is called a
switchover :
• The active module becomes unavailable
• You perform a manual switchover
• You remove and replace the active management module
The following sections explain how the switchover occurs for each event
Unavailable Active Module
The following events cause an active module to become unavailable and a switchover to occur:
• An active module experiences a problem significant enough to cause a reset of the module.
• The active module loses power.
When a switchover occurs, the active module resets itself and sends an interrupt signal to the standby module.
The standby module then becomes the active module and the interface modules continue to forward traffic.
The new active module begins to manage the system. When the original active module becomes available again
or is replaced, it assumes the role of standby module.
Manual Switchover
In some situations, you may want to manually switch the role of active management module from the currently
active module to the standby module. For instance, when you want to remove the current active management
module for maintenance. For example, if the module in slot 10 is the active module and the module in slot 9 is the
standby module and you want the module in 9 to be the active module and the module in 10 to be the standby
module, you can perform a manual switchover using the
switch-over-active-role command.
For information about performing this task, see “Manually Switching Over to the Standby Management Module” on
page 6-5.
When the switchover occurs, the standby module becomes the active module.
Starting in software release FSX 05.0.00, hitless switchover is supported. For more information, see “Layer 2
Hitless Switchover” on page 6-8.
Removal and Replacement of a Management Module
For information about how to remove and replace a management module, see “Replacing a Management Module”
on page 7-2.
This section explains how management module redundancy is affected when you remove and replace an active or
standby management module.