Chassis Management and Fabric Modules
CMM Redundancy
OmniSwitch 10K Hardware Users Guide
August 2015
page 3-9
CMM
Redundancy
CMM redundancy is one of the switch’s most important failover features. For CMM redundancy, two
fully-operational CMM modules must be installed in the chassis at all times. In addition, the software on
the two CMM modules must be synchronized. (Refer to
“Synchronizing the Primary and Secondary
CMMs” on page 3-9
for more information.)
When two CMMs are running in the switch, one CMM has the primary role and the other has the
secondary role at any given time. The primary CMM manages the current switch operations while the
secondary CMM provides backup (also referred to as “failover”).
In a redundant configuration, if the primary CMM fails or goes offline for any reason, the secondary
CMM is instantly notified. The secondary CMM automatically assumes the primary role.
CMM Failover Sequence
The figure below illustrates the CMM failover sequence:
1
CMM A (installed in the left-hand Slot A position) is operating in the primary mode. CMM B
(installed in the right-hand Slot B position) is operating in the secondary mode—i.e., it is functioning as
the standby CMM and is ready to take over chassis management functions in the event of a primary CMM
failure.
2
CMM A fails or is taken offline (e.g., the module is physically removed from the chassis).
3
CMM B automatically assumes the primary role.
Synchronizing the Primary and Secondary CMMs
CMM synchronization refers to the process of copying all files in the flash memory of the primary CMM
to the flash memory of the secondary CMM. This ensures that the file directories match exactly on both
modules, which prevents the secondary CMM from assuming the primary role with incorrect or outdated
software or configuration files in the event of a primary CMM failure.
Important.
In order to have effective CMM redundancy, CMM modules must be synchronized at
all times. For detailed information on CMM synchronization and managing flash memory content, refer to
the “Managing CMM Directory Content” chapter in the
Switch Management Guide
.
Содержание OmniSwitch 10K
Страница 1: ...Part No 060310 10 Rev H August 2015 OmniSwitch 10K Hardware Users Guide enterprise alcatel lucent com ...
Страница 8: ...Contents viii OmniSwitch 10K Hardware Users Guide August 2015 ...
Страница 18: ...OmniSwitch 10K Availability Features OmniSwitch 10K page 1 4 OmniSwitch 10K Hardware Users Guide August 2015 ...
Страница 64: ...Pinouts Chassis Management and Fabric Modules page 3 16 OmniSwitch 10K Hardware Users Guide August 2015 ...
