Within the SNMPv3 Coexistence mode, access is controlled via the Viewbased
Access Control Model (RFC-3415) and support is provided for SNMPv1/v2c/v3.
DOCSIS equipment also supports event reporting via SNMP traps, which are reported
to the head-end SNMP manager and are logged both in the CM or CMTS and
on a SYSLOG server in the head-end. Event messages are used to inform the operator
of issues that may need to be addressed.
Security and Privacy
Although the physical layout and shared media of the cable plant mean that the data
for each user passes by every other user on that section of the plant, the DOCSIS
standards ensure that every user??™s data is kept private through the use of link-layer
encryption technology. In DOCSIS 1.0??“2.0, a 56-bit data encryption standard (DES) is
provided. DOCSIS 3.0 equipment, on the other hand, supports the 128-bit advanced
encryption standard (AES). During operation, each CM negotiates an encryption key
with the CMTS that is used to encrypt the traffic in both directions on the HFC link.
The encryption key is unique for each CM, known only to the CM and the CMTS, and
updated periodically at a frequency set by the operator.
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