Cisco Systems MC-607 manual Configuring Routing, MC-643

Configuring Subscriber-End Broadband Access Router Features

Configuring Routing

	Command	Purpose
Step 2
	uBR924(config-if)#ip address 172.16.1.1	Assigns the appropriate IP address and subnet mask
	255.255.255.0	to the interface.
Step 3
	uBR924(config-if)# Ctrl-Z	Returns to privileged EXEC mode.
	uBR924#
	%SYS-5-CONFIG_I: Configured from console by console	This message is normal and does not indicate an error.

Verifying IP Address Configuration

To verify that you have assigned the correct IP address, enter the show arp command:

uBR924# show arp
Protocol	Address	Age (min)	Hardware Addr	Type	Interface
Internet	172.16.1.1	-	0009.0613.6030	ARPA	cable-modem0
Internet	4.0.0.28	-	00e0.1ed7.524d	ARPA	Ethernet0

Troubleshooting Tips

To troubleshoot the configuration, perform the following tasks:

•Make sure you are using the correct IP address.

•Make sure the cable interface is not shut down. Use the show running-configcommand to check the cable interface status.

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, use the following commands, beginning in global configuration mode:

	Command	Purpose
Step 1
	uBR924(config)# interface cable-modem0	Enters interface configuration mode for the cable
		access router interface.
Step 2
	uBR924(config-if)#no cable-modem compliant bridge	Turns off DOCSIS-compliant bridging.
	uBR924(config-if)# no bridge-group 59	Removes the default bridge group assignment from
	uBR924(config-if)# end	the cable interface.
		Returns to global configuration mode.
Step 3
	uBR924(config)# ip routing	Enables IP routing for the cable access router.
	uBR924(config)# ip subnet-zero	Enables the use of subnet zero for interface addresses
	uBR924(config)# ip route <IP address of CMTS>	and routing updates.
		Creates a static route to the CMTS to make sure that
	<subnet mask of CMTS>
		ToD packets are properly routed out of the cable
		access router.
Step 4
	uBR924(config)# router rip	Enters router configuration mode and enables RIP on
		the cable access router.

Cisco IOS Multiservice Applications Configuration Guide

MC-643