3-2
CiscouBR924 Software Configuration Guide
OL-0337-05 (8/2002)
Chapter3 Advanced Data-Only Configurations
Data-Only Routing
Data-Only Routing
The Cisco uBR924 router must be configured for routing mode t o 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 w ith the no bridge group interface
command.
•Configure the RIPv2 routing protocol (or static routes) on the cabl e 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
Step1 uBR924(config)#int c 0 Enter interface configuration mode for the cable
interface.
Step2 uBR924(config-if)# no cable-modem compliant bridge Disable DOCSIS-compliant bridging.
Step3 uBR924(config-if)# no bridge group number Remove the bridge group.
Step4 uBR924(config-if)# ip address dhcp Configure the cable interface to receive an IP
address from the DHCP server.
Step5 uBR924(config-if)# exit Return to global configuration mode.
Step6 uBR924(config)#int e 0 Enter interface configuration mode for Ethernet 0.
Step7 uBR924(config-if)# no bridge group number Remove the bridge group.
Step8 uBR924(config-if)# ip address ip-address subnet-mask Enter the Ethernet interface’s IP address and subnet
mask.
Step9 uBR924(config-if)# exit Return to global configuration mode.
Step10 uBR924(config)# ip routing Enable IP routing for the router.
Step11 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.
Step12 uBR924(config)# no cdp run (Optional) Disable the CiscoDiscovery 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.
Step13 uBR924(config)# ip default-gateway ip-address Set the default gateway for routing (typically, this is
the CMTS).