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Cisco uBR924 Software Configuration Guide
OL-0337-05 (8/2002)
Chapter 3 Advanced Data-Only Configurations
Data-Only Routing
Data-Only Routing
The Cisco uBR924 router must be configured for routing mode to use advanced features such as IPSec
encryption and firewall protection. The routing mode is also required if the PCs attached to the
Cisco uBR924 router are on a private network or on a different subnet than the subnet used by the CMTS.
The following steps are required to configure the routing mode on the Cisco uBR924 router:
• Disable DOCSIS-compliant bridging on the cable interface with the no cable modem compliant
bridge interface command.
• Remove the bridge group on the cable and Ethernet interfaces with the no bridge group interface
command.
• Configure the RIPv2 routing protocol (or static routes) on the cable and Ethernet interfaces.
To configure the Cisco uBR924 router, log in to the router, enter global configuration mode, and enter
the following commands:
Command Purpose
Step 1
uBR924(config)#int c 0 Enter interface configuration mode for the cable
interface.
Step 2
uBR924(config-if)# no cable-modem compliant bridge Disable DOCSIS-compliant bridging.
Step 3
uBR924(config-if)# no bridge group number Remove the bridge group.
Step 4
uBR924(config-if)# ip address dhcp Configure the cable interface to receive an IP
address from the DHCP server.
Step 5
uBR924(config-if)# exit Return to global configuration mode.
Step 6
uBR924(config)#int e 0 Enter interface configuration mode for Ethernet 0.
Step 7
uBR924(config-if)# no bridge group number Remove the bridge group.
Step 8
uBR924(config-if)# ip address ip-address subnet-mask Enter the Ethernet interface’s IP address and subnet
mask.
Step 9
uBR924(config-if)# exit Return to global configuration mode.
Step 10
uBR924(config)# ip routing Enable IP routing for the router.
Step 11
To use RIPv2:
uBR924(config)#router rip
uBR924(config-router)# version 2
uBR924(config-router)# network cable-network-number
uBR924(config-router)# network Ethernet-network-number
uBR924(config-router)# exit
Enter router configuration mode.
Enable RIP version 2 routing.
Enable routing on the cable interface’s IP network.
Enable routing on the Ethernet interface’s IP
network.
Return to global configuration mode.
Step 12
uBR924(config)# no cdp run (Optional) Disable the Cisco Discovery Protocol
(CDP) on the router. CDP is a proprietary protocol
for the discovery of Cisco routers running protocols
other than TCP/IP; because DOCSIS cable data
networks are primarily TCP/IP networks, CDP is not
necessary on the Cisco uBR924 router.
Step 13
uBR924(config)# ip default-gateway ip-address Set the default gateway for routing (typically, this is
the CMTS).