Cisco Systems uBR7246 Manual De Usuario

Voice, Video, and Home Applications Configuration Guide

Activate Address Resolution Protocol Requests

To activate ARP requests, use the following command in cable interface configuration mode:

Validation Tips

To verify if ARP has been activated, enter the command more system:running-config and look for 
the cable interface configuration information. If ARP has been activated, it does not appear in this 
output. If ARP has been deactivated, it will appear in the output as no cable arp as shown in this 
command output excerpt:

router# more system:running-config

Building configuration...

 

Current configuration:

!

interface Cable6/0

 ip address 1.1.1.1 255.255.255.0

 no keepalive

no cable arp 

cable insertion-interval 150000

 cable downstream annex B

 cable downstream modulation 64qam

 cable downstream interleave-depth 32

 cable downstream symbol-rate 5056941

 cable upstream 0 frequency 15008000

 cable upstream 0 fec

 cable upstream 0 scrambler

 no cable upstream 0 shutdown

!

Troubleshooting Tips

If you are having trouble, make sure you entered the correct port and modem card slot number when 
you activated ARP and when you entered the show interface cable command.

Proxy ARP allows the Cisco uBR7246 to issue ARP requests on behalf of cable modems on the same 
cable network subnet.

Because the downstream and upstreams are separate interfaces, modems cannot directly 

perform ARP with other modems on the cable plant.

The default values for the commands used in this configuration task are, in most cases, 

adequate to configure the Cisco uBR7246.

Enable ARP.