C H A P T E R 3 Configuring Cable Modem Interface Features; Activating Downstream Ports - Cisco 7246VXR - uBR Router Software Configuration Manual

Chapter 3 Configuring Cable Modem Interface Features
The default values for the commands used in this configuration step are adequate in most cases to
Note
configure the Cisco uBR7200 series CMTS.
To activate ARP requests, use the following command in cable interface configuration mode.
Command
Router(config-if)# cable arp
Verifying ARP Requests
To verify that cable ARP is activated, enter the more system:running-config command and look for the
cable interface configuration information. If ARP is activated, it does not appear in this output. If ARP
is deactivated, it appears in the output as
Router# more system:running-config
Building configuration...
Current configuration:
!
interface cable5/0
ip address 1.1.1.1 255.255.255.0
no keepalive
no cable arp
cable downstream annex B
cable downstream modulation 64qam
cable downstream interleave-depth 32
cable downstream symbol-rate 5056941
cable upstream 0 frequency 15008000
no cable upstream 0 shutdown
Tip If you are having difficulty with verification, verify that you entered the correct port and cable interface
line card slot number when you activated ARP and when you entered the
show interface cable command.

Activating Downstream Ports

To activate a downstream port on a Cisco uBR7200 series cable interface card for digital data
transmissions over the HFC network, complete the steps in the following table.
Command
Step 1
Router> enable
Password: password
Router#
Step 2
Router# configure terminal
Enter configuration commands, one per line. End
with CNTL/Z.
Router(config)#
OL-2239-03
Purpose
Enable ARP. This is the default.
no cable arp
Purpose
Enters enable (privileged EXEC) mode.
Enter the password.
You have entered privileged EXEC mode when the prompt
displays the pound symbol
Enters global configuration mode. You have entered global
configuration mode when the
This command can be abbreviated to config t or conf t.
Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
Configuring the Downstream Cable Modem Interface
.
.
(#)
(config)#
prompt appears.
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