15-3
Redundancy (Switch 8212zl)
Overview
Overview
Redundancy provides the ability to keep your switch operating by using dual
management modules, one active module and one standby module. In the
event of a failure, the currently active management module will switchover to
the standby management module, which then becomes the active
management module.
The advantages of redundant management are:
■
Maintaining switch operation if a hardware failure occurs on the active
management module
■
Minimizing restart time because of failure on a management module
■
Hotswapping a failed management module with no downtime
■
Allowing a faster software upgrade process (less downtime) when updat-
ing software versions
N o t e
The fabric modules are also redundant and can be enabled or disabled. See
“Enabling and Disabling Fabric Modules” on page 15-12.
Terminology
Redundant management uses the following terminology.
Active Management Module.
A management module that booted
successfully and is actively managing the switch.
Standby Management Module.
A management module that is ready to
become the active management module if the active management module
fails.
Failed Management Module.
A management module that did not pass
selftest and is not in standby mode.
Offline Management Module.
A management module that is offline
because redundancy is disabled.
Primary Image.
The software version stored in primary flash on each
management module.
3500-5400-6200-8200-MCG-Jan08-K_13_01.book Page 3 Monday, January 28, 2008 10:04 AM