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STANDARD Revision 1.0 C4® CMTS Release 8.3 User Guide

Chapter 13

CAM Sparing

 FlexCAM™ Hitless CAM Sparing ....................................................... 375

 Guidelines for CAM Spare Groups ................................................... 377

 Configuration Example ..................................................................... 378

 Deleting a CAM Spare-group ............................................................ 384

FlexCAM™ Hitless CAM Sparing

CAM sparing minimizes traffic loss and customer impact in case of a hardware or software failure. When an active CAM in

a spare-group fails, the spare CAM automatically takes over. The cable modems that were connected to the upstream and

downstream channels on the failed CAM are immediately connected to the spare CAM. This includes configuration of

downstream and upstream channels and port administrative status. Cable modems do not have to re-register, and they

incur minimal data loss. Failback from the spare CAM to a recovered CAM can be set to take place automatically or

manually.

When a failover occurs, the CMTS automatically reconfigures the spare CAM to take over the functions of the failed

module. This includes configuration of downstream and upstream channels and port administrative status. Depending on

how you configure the CMTS, the spare CAM remains the active module or automatically switches back to the original

active CAM once that CAM comes back online.

Arris C4 User Manual

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