When a particular CM comes online, it requests an IP address from a Dynamic Host
Configuration Protocol (DHCP) (RFC-2131) [3] server in the operator??™s data network.
The response from the DHCP server includes information on the filename and server
IP address for the configuration file that has been assigned to that particular CM.
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The CM then downloads the configuration file using Trivial File Transfer Protocol
(TFTP) (RFC-1350) and exchanges registration messaging with the CMTS in order to
inform the CMTS of the file??™s contents and to enable bridging of user data.
Management
The DOCSIS specifications include sophisticated network management tools built
upon the Simple Network Management Protocol (SNMP). A large number of required
management information base (MIB) objects are used to instrument and control the
various aspects of the network operation.
All DOCSIS devices support SNMPv1 and v2c, while DOCSIS 1.1??“3.0 devices also
support SNMPv3. The DOCSIS 1.1??“3.0 specifications define two management modes,
the NmAccess mode and the SNMPv3 Coexistence mode. Within the NmAccess mode,
access is controlled via SNMP community strings and support is only provided for
SNMPv1/v2c.
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