Specifications

DOCSIS 1.1 for Cisco uBR905 and Cisco uBR925 Cable Access Routers and Cisco CVA122 Cable Voice Adapters

Prerequisites for DOCSIS 1.1 Support

Cisco IOS Release 12.2(15)CZ

• Configuration Examples for DOCSIS 1.1 Support, page 36

• Additional References, page 39

• Command Reference, page 42

Prerequisites for DOCSIS 1.1 Support

Before you implement a DOCSIS 1.1 network, ensure that the following are true for your cable network:

• The Cisco uBR905 and Cisco uBR925 cable access routers and Cisco CVA122 cable voice adapter

must contain the proper digital certificates for BPI+ operation and Secure Software Download.

Initial versions of the Cisco uBR905 and Cisco uBR925 cable access routers and Cisco CVA122

cable voice adapter contained certificates for an early version of the DOCSIS 1.1 specification that

are no longer valid. To upgrade these certificates, see the document Upgrading the DOCSIS

Certificates in

Cisco uBR905/uBR925 Cable Access Routers and CVA122 Cable Voice Adapters at the following

URL:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122limit/122cz/upgdc

ert.htm

Note To update the digital certificates, you must also obtain the Cisco DOCSIS 1.1 Cable Modem

Certificate Upgrade CD-ROM (part number UBR/CVA-CERT-UPG). This one CD-ROM

works with the Cisco uBR905 and Cisco uBR925 cable access routers and Cisco CVA122

Cable Voice Adapters.

• Ensure that your network supports reliable broadband data transmission. Your plant must be swept,

balanced, and certified to NTSC or appropriate international cable plant recommendations. Ensure

that your plant meets all DOCSIS downstream and upstream RF requirements.

• Ensure that your CMTS is installed and configured to support DOCSIS 1.1 operation.

• Ensure that all other required headend or distribution hub routing and network interface equipment

is installed, configured, and operational, based on the services to support. This includes all routers,

servers (DHCP, TFTP, and ToD), network management systems, and other configuration or billing

systems. This includes IP telephony equipment including gatekeepers and gateways; backbone and

other equipment if supporting VPN; and dialup access servers, telephone circuits and connections,

and other equipment if supporting telco return.

• Ensure that the system clocks on the CMTS and on the time-of-day (ToD) servers are synchronized.

If this does not occur, the clocks on the CMs will not match the clocks on the CMTS, which could

interfere with BPI+ operations. In particular, this could prevent the proper verification of the digital

certificates on the CM.

• The DOCSIS specifications require that when the DOCSIS configuration file enables BPI+

encryption, the configuration file must also include a value for the Baseline Privacy Configuration

Settings Option field (TLV 17). If this field is not included when BPI is enabled, the router rejects

the BPI configuration. If MAC debugging is enabled (using the debug cable-modem mac

command), the router also displays the displays the debugging message

CMAC_LOG_BPKM_REQUIRED_TLV17_ABSENT on the console.

• Ensure that DHCP and DOCSIS 1.1 configuration files have been created and pushed to appropriate

servers such that each cable modem, when initialized, can transmit a DHCP request, receive an IP

address, obtain TFTP and ToD server addresses, and download DOCSIS 1.1 configuration files.