4-4
Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
OL-2239-03
Chapter 4 Configuring DOCSIS Baseline Privacy Interface on the Cisco uBR7200 Series
DOCSIS 1.1 Baseline Privacy Interface Plus Overview
Note For the CMTS, BPI is enabled by default when you select an image that supports BPI. For CMs, enable
BPI via the DOCSIS configuration file using one of the provisioning tools identified in the
“DOCSIS 1.0
Feature Support” section on page 1-49.
When baseline privacy is enabled, the Cisco uBR7200 series generates Traffic Encryption Keys (TEKs)
for each applicable SID; 56-bit encryption/decryption is the default for Cisco
uBR7200 series
equipment.
The router uses the keys to encrypt downstream data and decrypt upstream traffic from two-way
cable
interfaces. The Cisco uBR7200 series router generates keys for unicast, broadcast, and multicast
operation as appropriate. Keys are refreshed periodically and have a default lifetime of 12
hours.
DOCSIS 1.1 Baseline Privacy Interface Plus Overview
DOCSIS 1.0 included a BPI to protect user data privacy across the shared-medium cable network and to
prevent unauthorized access to DOCSIS-based data transport services across the cable network. BPI
encrypts traffic across the RF interface between the cable modem and CMTS, and also includes
authentication, authorization, and accounting (AAA) features.
BPI supports access control lists (ACLs), tunnels, filtering, protection against spoofing, and commands
to configure source IP filtering on RF subnets to prevent subscribers from using source IP addresses that
are not valid.
DOCSIS 1.1 enhances these security features with Baseline Privacy Interface Plus (BPI+), which
includes the following enhancements:
• Digital certificates provide secure user identification and authentication.
• Key encryption uses 168-bit Triple DES (3DES) encryption that is suitable for the most sensitive
applications.
• 1024-bit public key with Pkcs#1 Version 2.0 encryption.
• Multicast support.
• Secure software download allows a service provider to upgrade a cable modem's software remotely,
without the threat of interception, interference, or alteration.
Note BPI+ is described in the Baseline Privacy Interface Plus Specification (SP-BPI+-I07-010829), available
from CableLabs (http://www.cablelabs.com).
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