Specifications

Configuring Routing
Bridging and Routing Features for the Cisco uBR904 Cable Modem 11
Configuring Routing
If you have one or more PCs directly connected to your cable modem, you can change the cable
modem’s configuration from bridging to routing. When configured as a bridge, the cable modem can
have a maximum of three PCs directly connected; when configured as a router, it can have four PCs
directly connected. See the “Configuration Options” section on page 7 for details on both of these
configurations.
To configure the Cisco uBR904 cable modem for routing, perform the following tasks, starting in
global configuration mode:
Step Command Purpose
1
uBR904(config)#interface cable-modem0
Enter interface configuration mode for the cable
modem interface.
2
uBR904(config-if)#no cable-modem
compliant bridge
uBR904(config-if)#end
Turn off MCNS auto-configured bridging.
Return to global configuration mode.
3
uBR904(config)#ip routing
Enable IP routing for the cable modem.
4
uBR904(config)#router rip
Enter router configuration mode and enable Routing
Information Protocol (RIP) on the cable modem.
5 uBR904(config-router)#network
network-number
Specify the network connected to the cable modem on
which the RIP process will operate. If the cable modem
is attached to more than one network, enter each IP
address in a separate command.
6
uBR904(config-router)#end
uBR904(config)#interface cable-modem0
Exit router configuration mode.
Return to interface configuration mode for the cable
modem interface.
7
uBR904(config-if)#ip rip receive v 2
Specify that only RIP Version 2 packets will be
received on the coaxial cable interface.
8
uBR904(config-if)#ip rip send v 2
Specify that only RIP Version 2 packets will be sent on
the coaxial cable interface.
9
uBR904(config-if)#end
uBR904(config)#interface ethernet0
Exit interface configuration mode for the cable modem
interface and enter interface configuration mode for the
Ethernet0 interface.
10
uBR904(config-if)#ip rip receive v 2
Specify that only RIP Version 2 packets will be
received on this Ethernet interface.
11
uBR904(config-if)#ip rip send v 2
Specify that only RIP Version 2 packets will be sent on
this Ethernet interface.
12
uBR904(config-if)#Ctrl-z
uBR904#copy running-config
startup-config
Building configuration...
Return to privileged EXEC mode.
Save the configuration to nonvolatile RAM so that it
won’t be lost in the event of a reset, power cycle, or
power outage.