Cisco Systems UBR900 specifications Configuring Routing

Configuring Routing

Configuring Routing

DOCSIS-compliant transparent bridging is the factory default configuration of the Cisco uBR900 series cable access router. To change the configuration of your cable access router from bridging to routing using the CLI, perform the following tasks, starting in global configuration mode:

Step	Command	Purpose
1	uBR924(config)#interface cable-modem0	Enter interface configuration mode for the cable access
		router interface.
2	uBR924(config-if)#no cable-modem compliant bridge	Turn off DOCSIS-compliant bridging.
	uBR924(config-if)#nobridge-group 59	Remove the default bridge group assignment from the
		cable interface.
	uBR924(config-if)#end	Return to global configuration mode.
3	uBR924(config)#ip routing	Enable IP routing for the cable access router.
	uBR924(config)#ip subnet-zero	Enable the use of subnet zero for interface addresses and
		routing updates.

uBR924(config)#ip route <IP address of CMTS> <subnet mask of CMTS>

Create a static route to the CMTS to make sure that Time of Day (TOD) packets are properly routed out of the cable access router.

4	uBR924(config)#router rip	Enter router configuration mode and enable Routing
		Information Protocol (RIP) on the cable access router.
5	uBR924(config-router)#networknetwork-number	Specify the network connected to the cable access router
		on which the RIP process will operate. If the cable access
		router is attached to more than one network, enter each IP
		address in a separate command.
6	uBR924(config-router)#end	Exit router configuration mode.
	uBR924(config)#interface cable-modem0	Return to interface configuration mode for the cable
		access router interface.
7	uBR924(config-if)#ip rip receive v 2	Specify that only RIP Version 2 packets will be received
		on the coaxial cable interface.
8	uBR924(config-if)#ip rip send v 2	Specify that only RIP Version 2 packets will be sent on
		the coaxial cable interface.
9	uBR924(config-if)#end	Exit interface configuration mode for the cable access
	uBR924(config)#interface ethernet0	router interface and enter interface configuration mode for
		the Ethernet0 interface.
10	uBR924(config-if)#nobridge-group 59	Remove the default bridge group assignment from the
		Ethernet0 interface.
11	uBR924(config-if)#ip rip receive v 2	Specify that only RIP Version 2 packets will be received
		on this Ethernet interface.
12	uBR924(config-if)#ip rip send v 2	Specify that only RIP Version 2 packets will be sent on
		this Ethernet interface.
13	uBR924(config-if)#Ctrl-z	Return to privileged EXEC mode.
	uBR924#copy running-config startup-config	Save the configuration to nonvolatile RAM so that it
	Building configuration...	won’t be lost in the event of a reset, power cycle, or power
		outage.

Configuring the Cisco uBR900 Series Cable Access Routers 39