Cisco Systems UBR10012 3-32

3-32

Cisco uBR10012 Universal Broadband Router Software Configuration Guide

OL-1520-05

Chapter3 Configuring Cable Interface Features for the CiscouBR10012Router

Cable Interface Configuration Examples

! Allows the system to use a full range of IP addresses, including subnet zero, for

! interface addresses and routing updates.

ip subnet-zero

! Enables Cisco Express Forwarding.

ip cef

! Configures a Cisco IOS Dynamic Host Configuration Protocol (DHCP) server to insert the

! DHCP relay agent information option in forwarded BOOTREQUEST messages.

ip dhcp relay information option

! Enters the virtual routing forwarding (VRF) configuration mode and maps a VRF table to

! the virtual private network (VPN) called MGMT-VPN. The VRF table contains the set of

! routes that points to or gives routes to the CNR device, which provisions the cable

! modem devices. Each VRF table defines a path through the MPLS cloud.

ip vrf MGMT-VPN

! Creates the route distinguisher and creates the routing and forwarding table of the

! router itself.

rd 100:1

! Creates a list of import and/or export route target communities for the VPN.

route-target export 100:2

route-target export 100:3

! Maps a VRF table to the VPN called ISP1-VPN.

ip vrf ISP1-VPN

! Creates the route distinguisher and creates the routing and forwarding table of the

! router itself.

rd 100:2

! Creates a list of import and/or export route target communities for the VPN.

route-target import 100:1

! Maps a VRF table to the VPN called ISP2-VPN.

ip vrf ISP2-VPN

! Creates the route distinguisher and creates the routing and forwarding table of the

! router itself.

rd 100:3

! Creates a list of import and/or export route target communities for the VPN.

route-target import 100:1

! Maps a VRF table to the VPN called MSO-isp. Note: MSO-isp could be considered ISP-3; in

! this case, the MSO is competing with other ISPs for other ISP services.

ip vrf MSO-isp

! Creates the route distinguisher and creates the routing and forwarding table of the

! router itself.

rd 100:4

! Creates a list of import and/or export route target communities for the VPN.

route-target import 100:1

! Builds a loopback interface to be used with MPLS and BGP; creating a loopback interface

! eliminates unnecessary updates (caused by physical interfaces going up and down) from

! flooding the network.

interface Loopback0

ip address 10.0.0.0 255.255.255.0

no ip directed-broadcast

! Assigns an IP address to this Fast Ethernet interface. MPLS tag-switching must be

! enabled on this interface.

interface FastEthernet0/0/0

description Connection to MSO core.

ip address 10.0.0.0 255.255.255.0

no ip directed-broadcast

full-duplex

tag-switching ip

! Enters cable interface configuration mode and configures the physical aspects of the

! 5/0/0 cable interface. Please note that no IP addresses are assigned to this interface;