Brocade BigIron RX Series Configuration Guide - Manual (Page 97)

BigIron RX Series Configuration Guide 19
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How management module redundancy works
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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 example, if the module in slot M2 is the
active module and the module in slot M1 is the standby module and you want the module in M1 to
be the active module and the module in M2 to be the standby module, you can perform a manual
switchover using the switchover command. For information about performing this task, refer to
“Manually switching over to the standby management module” on page 24.
When the switchover occurs, the standby module becomes the active module.
This section explains how management module redundancy is affected when you remove and
replace an active or standby management module.
Removal and replacement of an active management module
If you remove the active management module, the standby module automatically assumes the role
of the active module. After you insert a replacement module in the slot from which the original
active module was removed, the replacement module becomes the standby module. The module
boots from the source specified for the active module. The active management module can boot
from the following sources:
• The active management module’s flash memory.
• A PCMCIA flash card inserted in one of the PCMCIA slots in the active management module’s
front panel.
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 BigIron RX Series devices. 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 can boot from the following
sources:
• The active management module’s flash memory.
• A PCMCIA flash card inserted in one of the PCMCIA slots in the active management module’s
front panel.
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:
• Management sessions
• Syslog and SNMP traps
• MAC addresses