STANDARD Revision 1.0 C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved. 322
Chapter 10
Control Complex Redundancy
Overview
A control complex consists of one SCM and its associated RCM. The SCM in slot 19 and the RCM in slot 17 make up the
control complex in a simplex system. In order to have control complex redundancy (CCR) the C4/c CMTS must be a duplex
system. In a duplex CMTS both control complexes are equipped; one is active the other is standby.
CCR ensures high reliability for system-wide Operations Administration Maintenance and Provisioning (OAM&P), switching,
and routing. The control complex redundancy feature provides 1+1 active/standby redundancy between two pairs of
SCM/RCM modules. The failure of an active SCM/RCM pair immediately causes a failover to the standby SCM/RCM pair.
Key characteristics of control complex redundancy include:
Reduced customer impact on any SCM or RCM failure (hardware or software)
Hot standby SCM/RCM pair with complete replication of configuration and customer data
Fault correlation between active and standby SCM/RCM pairs
Software infrastructure support for replication of software components between active and standby SCM/RCM pairs
Note: Routing protocols restart after a control complex failover. Convergence time varies based upon the specific
configuration.
For a summary of the types of SCM cards, see System Control Module (SCM) (page 165).
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