Configuring Headend Broadband Access Router Features
Activating IP Address Resolution Protocol
MC-574
Cisco IOS Multiservice Applications Configuration Guide
Assigning the Spectrum Group and the Upstream Ports
To configure a frequency hop table after you have determined which upstream ports you want assigned
to a combiner group, use the following commands:
Verifying Spectrum Group and Upstream Port Assignments
To display the current allocation table and frequency assignments, use the show cable spectrum-group
command.
Activating IP Address Resolution Protocol
Address Resolution Protocol (ARP) is an Internet protocol used to map IP addresses to MAC addresses
on computers and other equipment installed in a network. You need to activate ARP requests on the cable
interface so that the Cisco uBR7200 series can perform IP address resolution on the downstream path.
Note The default values for the commands used in this configuration step are adequate in most
cases to configure the Cisco uBR7200 series.
Activating Cable ARP Requests
To activate ARP requests, use the following command in cable interface configuration mode:
Command Purpose
Step 1
CMTS01(config)# interface cable slot/port
Enters cable interface configuration mode for the
interface to which you wish to assign a spectrum
group.
Step 2
CMTS01(config-if)# cable spectrum-group usport
Assigns the spectrum group to the interface.
Step 3
CMTS01(config-if)# cable upstream number
spectrum-group usport
Assigns the upstream ports to the spectrum group for
the interface.
Step 4
CMTS01(config-if)# no cable upstream slot/port
shutdown
Places the upstream port in the “admin up” state.
Step 5
CMTS01(config-if)# exit
CMTS01# test cable hop c3/0
CMTS01# test cable hop c3/0
Exits configuration mode and forces the system to
hop.
Command Purpose
CMTS01(config-if)# cable arp
Enables ARP. This is the default.
