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debug cable arp filter
debug cable arp filter
To display debugging messages about the filtering of Address Resolution Protocol (ARP) broadcasts,
use the debug cable arp filter command in privileged EXEC mode. To the debugging messages, use the
no form of this command.
Syntax Description
This command has no arguments or keywords.
Defaults
No default behavior or values.
Command Modes
Privileged EXEC
Command History
Release
12.2(15)BC2
Usage Guidelines
If you suspect a particular CM is generating a large volume of ARP traffic, you can enable debugging
for that particular CM using the debug cable arp command. If the ARP traffic is excessive, you can
enable ARP filtering on the associated cable interface using the cable arp filter command. To show the
results of that ARP filtering, use the debug cable arp filter command.
Because this command can produce a large volume of debug information, it does not produce any output
Tip
until you first limit debugging output to a particular Service ID (SID) or one or more particular CM MAC
addresses, using the debug cable interface sid or debug cable mac-address commands, respectively.
Examples
The following example shows how to enable debugging messages for ARP filtering for a particular MAC
address, and samples of the typical messages that can be displayed:
Router# debug cable mac-address 000C.0102.0304
Router# debug cable arp filter
CMTS arp filter debugging is ON
Router#
ARP Req Filter = T shdw 000C.0102.0304 sip 10.11.13.1 dhdw 00C0.0809.0A0B dip
192.168.100.14 cnt 2
ARP Req Filter = T src_ip 10.11.13.1 dst_ip 192.168.100.14
Cisco Broadband Cable Command Reference Guide
5-8
debug cable arp filter
no debug cable arp filter
Modification
This command was introduced for the Cisco uBR7246VXR and
Cisco uBR10012 universal broadband routers.
Chapter 5
Cisco CMTS Debugging Commands
OL-1581-08
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