Filter
Top Products
Redundancy (Switches 8200zl)
Notes on How the Active Module is Determined
Notes on How the Active Module is
Determined
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 will be 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 will take control and
become 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 will always become the standby
module. The standby module does not become active unless a switchover
occurs.
3. If there are two management modules and one fails selftest, the one that
passes selftest becomes the active management module.
4. If only one of two modules was ever booted in the chassis, that module is
given precedence.
5. The module that was active on the last boot becomes the active manage-
ment module. This guarantees that the active module has the latest
configuration data.
6. If both management modules have previously booted in this chassis and
were “active” the last time booted, the module that booted most recently
becomes the active management module.
7. If none of the above conditions are applicable, the module in the lowest
slot becomes the active management module.
15-44