关于C-CMTS对CableModem数量限制的问题探讨

Discussion on Access Limitations of C-CMTS to Cable Modem

珠江数码在使用C-CMTS过程中积累了一定经验。发现C-CMTS在建设运维中出现部分Cable Modem不能上线的问题,通过分析C-DOCSIS协议、互联网交换原理,和供应商讨论设备配置,最终发现MAC地址表、ARP表和C-CMTS服务流三部分共同对Cable Modem的上线数量产生限制,尤其是C-CMTS服务流限制是造成故障的主要原因。最后针对以上三种限制,提出使用建议和解决办法。

Guangzhou Digital Media Group has accumulated some experience in the course of using CCMTS. Some cablemodems are found with issues that can＇t be on line. Through deeply analysis of C-DOCSIS protocol, internet exchange principle and device configurations, the MAC address table, ARP table and C-CMTS service flow are finally found out the cause of the limitations of C-CMTS to CableModem. Especially, the C-CMTS service flow restriction is the main reason of the breakdown problem. At last, recommendations and solutions for the above three restrictions are proposed.