user manual

Configuring Headend Broadband Access Router Features
Configuring DHCP Options
MC-576
Cisco IOS Multiservice Applications Configuration Guide
Activating Cable Proxy ARP Requests
To activate cable proxy ARP for host-to-host communications, use the following command in cable
interface configuration mode:
Verifying Cable Proxy ARP Requests
To verify whether or not cable proxy ARP has been activated or deactivated, enter the more
system:running-config command and look for the cable interface configuration information. If cable
proxy ARP has been activated, it does not appear in the output. If cable proxy ARP has been deactivated,
it appears in the output as
no cable proxy-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 proxy-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 cable proxy ARP.
Configuring DHCP Options
The following sections describe configurable DHCP options for the Cisco uBR7200 series.
Activating Cable Relay Agent
The cable relay agent is for use with DOCSIS-based DHCP servers that use option 87 to automatically
map the Ethernet MAC address of a host (end user PC) with the cable modem to which it is connected.
Command Purpose
CMTS01(config-if)# cable proxy-arp
Enables proxy ARP on the cable interface. This is
the default.