KB.15.15

ActionCommand

Affects both modules. The config file is immediately sent to the standby

module and also becomes the default on that module when the next boot

occurs.

startup-default

Affects only the active module. The standby may become the active module

when the updated active module is booted.

update

A write memory updates the config file in flash on the active module.

The file is then sync'd to the standby module.

write

Using the WebAgent for redundant management

The WebAgent can be used to display information about the active and standby management

modules.

Online Help is available for the WebAgent, which you can open by clicking on the question mark

(?) in the upper right corner of any of the WebAgent screens. An example redundancy screen is

shown in Figure 275 (page 496).

To access the redundancy information in the WebAgent:

1. In the WebAgent navigation panel, click System.

2. Click Redundancy. The following screen displays.

Figure 275 Example of redundancy screen in the WebAgent

Determining active module

Both management modules run selftest routines to determine which module becomes the active

management module and which becomes the standby management module. The module that was

last active in the chassis is given precedence and becomes the "active" module. This module is

the one that is booted going forward. If a module fails selftest and is unable to communicate with

the other module, it does not take control as the management module. The other management

module takes control and becomes the active module.

If both modules fail selftest, the fault LED flashes and neither module is operational.

NOTE: You are not allowed to switchover to a management module that is not in standby mode.

The module must have passed selftest and be in standby mode.

The entire boot decision process works as follows:

1. If there is only one management module, that is the active management module.

2. If one module is already booted and operational, a newly inserted module or the other

management module booting always becomes the standby module. The standby module does

not become active unless a switchover occurs.

496 Chassis Redundancy (8200zl Switches)