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Cisco uBR924 Software Configuration Guide
OL-0337-05 (8/2002)
Chapter 2 DOCSIS-Bridging Configuration
Configuring the Attached CPE Devices
Configuring the Attached CPE Devices
In its “plug-and-play” bridging mode, the Cisco uBR924 router does not need any additional
configuration to support the computers or other CPE devices that will access the Internet through the
router’s connection to the cable network. However, the PCs and CPE devices must be configured to
support DHCP allocation of IP addresses.
Each computer and CPE device performs this configuration differently. For Windows 95, for example,
you would open up the Network control panel, select the computer’s TCP/IP Ethernet adapter, and set
the IP address configuration to “Obtain and IP address automatically.”
Reconfiguring DOCSIS-Compliant Bridging
To reconfigure the Cisco uBR924 router to support DOCSIS-compliant bridging after it has been
configured for routing, log in to the Cisco uBR924 router, enter global configuration mode, and enter the
following commands:
Command Purpose
Step 1
uBR924(config)#no ip routing Disable IP routing on the Cisco uBR924 router.
Step 2
uBR924(config)#int e 0 Enter interface configuration mode for the Ethernet
interface.
Step 3
uBR924(config-if)# no ip address Remove the IP address from the Ethernet interface.
Step 4
uBR924(config-if)# no ip route-cache Remove the high-speed switching caches for IP
routing.
Step 5
uBR924(config-if)# bridge-group bridge-group Assign the Ethernet interface to a bridge spanning
group (choose an arbitrary integer from 1–63).
Step 6
uBR924(config-if)# bridge-group bridge-group
spanning-disabled
Disable the spanning tree on the Ethernet interface.
Step 7
uBR924(config-if)# exit Exit the interface configuration mode for the
Ethernet interface.
Step 8
uBR924(config)# int c 0 Enter interface configuration mode for the cable
interface.
Step 9
uBR924(config-if)# no ip address Remove the IP address from the cable interface.
Step 10
uBR924(config-if)# no keep alive Disable keepalive messages on the cable interface.
Step 11
uBR924(config-if)# no ip route-cache Remove the high-speed switching caches for IP
routing.
Step 12
uBR924(config-if)# cable modem compliant bridge Enable DOCSIS-compliant bridging.
Step 13
uBR924(config-if)# bridge-group bridge-group Assign the cable interface to the same bridge
spanning group used for the Ethernet interface.
Step 14
uBR924(config-if)# bridge-group bridge-group
spanning-disabled
Disable the spanning tree on the cable interface.
Step 15
uBR924(config-if)# Ctrl-Z Return to privileged EXEC mode.
Step 16
uBR924# copy running-config startup-config Save the configuration to nonvolatile RAM.
Step 17
uBR924# show startup-config Display the configuration file that was just created.