March 2005
Hardware Basics
49
Chassis Management
Module (CMM)
The Chassis Management Module (CMM) is the management
unit for OmniSwitch 7700/7800 switches. In its role as the
management unit, the CMM provides key system services,
including:
•
Console, modem, and Ethernet management port
connections to the switch
•
Software and configuration management, including the
Command Line Interface (CLI)
•
Web-based management (WebView)
•
SNMP management
•
Power management
•
Temperature management
•
Switch diagnostics
•
Important availability features, including redundancy
(when used in conjunction with another CMM) and
image rollback.
CMM Redundancy
CMM redundancy is an important resiliency feature. For
CMM redundancy, two fully-operational CMM modules must
be installed in the chassis at all times.
When two CMMs are running in the switch, one CMM has the
primary role and one CMM 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”).
Note.
By default, the CMM in slot A automatically
assumes the primary role. Refer to pages
48
or
50
for
CMM slot A and B positions.
If the primary CMM fails or goes offline for any reason, the
secondary CMM is notified. The secondary CMM then auto-
matically assumes the primary role.
For important information on CMM redundancy, refer to your
Hardware Users Guide
.
