Cisco Systems uBR7200 Activating Host-to-Host Communication Proxy ARP, Verifying ARP Requests

Configuring Headend Broadband Access Router Features

Activating Host-to-Host Communication (Proxy ARP)

Verifying ARP Requests

To verify whether or not cable ARP has been activated, enter the more system:running-configcommand 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:

CMTS01# 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

To troubleshoot the configuration, make sure you entered the correct port and cable modem card slot number when you activated ARP and when you entered the show interface cable command.

Activating Host-to-Host Communication (Proxy ARP)

Cable proxy ARP allows the Cisco uBR7200 series to issue cable ARP requests on behalf of cable modems on the same cable network subnet.

Note Because the downstream and upstreams are separate interfaces, modems cannot directly perform ARP with other modems on the cable plant.

Note The default values for the commands used in this configuration task are adequate in most cases to configure the Cisco uBR7200 series.

Cisco IOS Multiservice Applications Configuration Guide

MC-575