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Cisco uBR10012 Universal Broadband Router Software Configuration Guide
OL-1520-05
Chapter3 Configuring Cable Interface Features for the CiscouBR10012Router Configuring Optional Cable Interface Features

Verifying Cable Proxy ARP Requests

To verify if cable proxy ARP has been activated or deactivated, enter the moresystem: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.
Router# more system:running-config
Building configuration...
Current configuration:
!
interface cable5/0/0
ip address 1.1.1.1 255.255.255.0
no keepalive
no cable proxy-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, make sure that you entered the correct port and cable
interface line card slot number when you activated cable proxy ARP.
Activating Packet Intercept Capabilities
To activate packet intercept functionality, use the following commands in cable interface configuration mode.
Configuring Payload Header Suppression and Restoration
Payload Header Suppression (PHS) is a new feature in the DOCSIS1.1 MAC driver. The PHS feature is
used to suppress repetitive or redundant portions in packet headers before transmission on the DOCSIS
link. The upstream receive driver is now capable of restoring headers suppressed by CMs, and the
downstream driver is capable of suppressing specific fields in the packet header before forwarding the
frame to the CM.
Command Purpose
Router(config-if)# cable intercept
xxxx.xxxx.xxxx Specifies a MAC address on the cable network for which
interception capabilities are to be activated. There is a
limit of 10 MAC addresses.
Router(config-if)# no cable intercept
xxxx.xxxx.xxxx Disables interception after it is enabled.
Command Purpose
show interface cable x/0/0
service-flow [sfid] phs Displays cable interface information.
debug cable error Displays errors that occur in the cable MAC protocols. To disable
debugging output, use the no form of the command.
debug cable phs Displays the activities of the PHS and restoration driver. The no
form of this command disables debugging output.