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becomes the standby module. The module boots from the source specified for the
active module. The active management module boots from the active management
module's flash memory.
Note: Before removing the active management module, IBM recommends that you
After the replacement module boots, the active module compares the standby
module's flash code and system-config file to its own. If differences exist, the active
module synchronizes the standby module's flash code and system-config file with
its own.
Removal and replacement of a standby management module
You can remove a standby management module without causing a switchover to
occur. The active module continues to function as is. Communication between the
active module and the removed module stops until the new module is installed in
the chassis. After the new module is installed, it assumes the role of standby
module. The module boots from the source specified for the active module. The
active management modules boot from the active management module's flash
memory.
After the module boots, the active module compares the standby module's flash
code and system-config file to its own. If differences exist, the active module
synchronizes the standby module's flash code and system-config file with its own.
Switchover implications
After the role of the active management module switches from one module to
another, you must be aware of implications that affect the following areas:
v Management sessions
v Syslog and SNMP traps
v MAC addresses
The following sections explain the implications for these areas.
Management sessions
You can establish management sessions with the active management module's
management port. If a switchover occurs, the management port on the original
active module shuts down and all open CLI, Web management interface, and
IronView Network Manager sessions with that port close. You can open new
sessions with the new active module, provided that the new active module has the
same management port connections. (for example, if you were accessing the Web
management interface via a PC connected to the original active module's
management port, you can open a new session if a PC is connected to the new
active module's management port.)
In the scenario described above, you can open a new session using the same IP
address you were using before the switchover. (You configure an IP address for the
active module only; if a switchover occurs, the IP address is used by the new active
module.)
first issue the command switch-over-active-role. For details, see "Manually
switching over to the standby management module" on page 80.
Chapter 6. Using a redundant management module
77
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