Cisco Systems UBR900

Cisco IOS Software Feature Sets

Configuring the Cisco uBR900 Series Cable Access Routers 3

Base IP Bridging includes full and DOCSIS-compliant bridging and DOCSIS Baseline Privacy. The

Base IP Bridging feature set allows the Cisco uBR900 series cable access router to function as a

DOCSIS 1.0 cable modem and to interoperate with any DOCSIS 1.0-qualified CMTS. It provides

basic high-speed Internet connectivity for users who want to connect only one computer to the cable

network.

DOCSIS-compliant bridging (also referred to as “plug-and-play” bridging) is the default

configuration for Cisco uBR900 series cable access routers. While in plug-and-play bridging mode,

the router locates a downstream and upstream channel; finds ToD, TFTP, and DHCP servers; obtains

an IP address; downloads a DOCSIS configuration file; and obtains DHCP parameters to work in

bridging mode.

Note This feature set does not include Easy IP and Routing.

In DOCSIS-compliant bridging mode, the Cisco uBR900 series cable access router acts as a

transparent bridge for the following device combinations:

•3 CPE devices when using Cisco IOS Release 12.0(4) XI1 or higher

•254 CPE devices when using Cisco IOS Release 12.0(5)T or higher images, or Cisco IOS

Release 12.1.

Note The ability of the Cisco uBR900 series cable access router to grant access to CPE devices is

controlled by the MAX CPE field in the DOCSIS configuration file. The MAX CPE field defaults

to one CPE device unless otherwise set to a higher number.

The Home Office feature set provides high-speed Internet connectivity for customers who have a

small home network (typically 2-4 computers). In addition to full DOCSIS 1.0 support and all of the

functionality of the Base IP Bridging feature set, the Home Office feature set (also known as Easy

IP) supports intelligent Dynamic Host Configuration Protocol (DHCP) server functions, including

DHCP Relay Agent and DHCP Client functionality. It also supports Easy IP (NAT/PAT).

This feature set allows the Cisco uBR900 series cable access router great flexibility in administering

IP addresses for the PCs and other customer premises equipment it is connecting to the cable

network. The DHCP functionality allows intelligent use of the IP addresses that allow customer

premises computers and other equipment to connect to the Internet. The NAT/PAT functionality

allows you to use private IP addresses on the local network, while still maintaining connectivity to

the Internet.

In addition to full DOCSIS 1.0 support and all of the functionality of the Easy IP feature set, the

Small Office feature set supports the Cisco IOS firewall feature set which provides a wide range of

security features for Cisco uBR900 series cable access routers. Using the firewall feature set,

Cisco uBR900 series cable access routers act as buffers between the customer’s private enterprise

network and the Internet and other connected public networks.