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CiscouBR924 Software Configuration Guide
OL-0337-05 (8/2002)
Chapter2 DOCSIS-Bridging Configuration
Cisco IOS Configuration File
Sample Configuration for DOCSIS-Compliant Bridging

The following shows a typical Cisco IOS configuration for a Cisco uBR924 router t hat is operating in

“plug and play” DOCSIS-compliant bridging mode.

version 12.1
service config
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname ubr924
!
clock timezone - 4
ip subnet-zero
no ip routing
!
voice-port 0
!
voice-port 1
!
interface Ethernet0
no ip directed-broadcast
no ip route-cache
bridge-group 59
bridge-group 59 spanning-disabled
!
interface cable-modem0
ip address dhcp
no ip directed-broadcast
no ip route-cache
bridge-group 59
bridge-group 59 spanning-disabled
!
ip classless
no ip http server
no service finger
!
!
line con 0
transport input none
line vty 0 4
!
end

This configuration shows the following requirements for DOCSIS-compliant br idging:

•IP routing is disabled.

•No IP address is assigned to the cable interface; instead, the ip address dhcp command indicates

that a DHCP server assigns an IP address to the cable interface. The Ethernet interface uses the same

IP address because the router is acting as a bridge between the two interfaces, making them part of

the same IP network—when the router is in DOCSIS-bridging mode, the IP addresses are

automatically assigned during the provisioning process.