Cisco Cisco IOS Software Release 12.3(2)XF

Cisco IOS Release 12.3(9a)BC also removes a prior caveat with HCCP Protect interfaces. Previously, in 
the event of a revert-back HCCP N+1 switchover, manual removal of cable arp filter reply and 
cable arp filter request configurations may have been required afterward on Protect interfaces.

For more information about ARP Filtering, refer to the following document on Cisco.com:

Cisco IOS Release 12.3(9a)BC introduces support for the Cisco Broadband Troubleshooter (CBT) 
Version 3.2 on the Cisco uBR7100 series universal broadband router, with newly supported 
interoperability for the following additional software features:

Multiple Service Operators (MSOs) provide a variety of services such as TV, video on demand, data, and 
voice telephony to subscribers. Network Administrators and radio frequency (RF) technicians need 
specialized tools to resolve RF problems in the MSO’s cable plant. Cisco Broadband Troubleshooter 3.2 
(CBT 3.2) is a simple, easy-to-use tool designed to accurately recognize and resolve such issues. 

The user can select up to three different cable modems (CMs) under the same CMTS or three different 
upstreams under the same CMTS. In addition, CBT 3.2 introduces the ability to display upstreams and 
cable modems combined (mixed) on the same trace window for monitoring and for playback. 

reply-accept number 
window-size 

Configures the cable interface to accept only the specified number of ARP 
reply packets every window-size seconds for each active Service ID (SID) on 
that interface. The cable interface drops ARP reply packets for a SID that 
would exceed this number. 

number = (Optional) Number of ARP reply packets that is allowed for 
each SID within the window time period. The allowable range is 0 to 20 
packets, with a default of four packets. If number is 0, the cable interface 
drops all ARP reply packets. If not specified, this value uses default.

window-size = (Optional) Size of the window time period, in seconds, in 
which to monitor ARP replies. The valid range is one to five seconds, with 
a default of two seconds. 

request-send number 
window-size 

Configures the cable interface to send only the specified number of ARP 
request packets every window-size seconds for each active SID on that 
interface. The cable interface drops ARP requests for a SID that would exceed 
this number. 

number = (Optional) Number of ARP request packets that is allowed for 
each SID within the window time period. The allowable range is 0 to 20 
packets, with a default of 4 packets. If number is 0, the cable interface does 
not send any ARP request packets. 

window-size = (Optional) Size of the window time period, in seconds, in 
which to monitor ARP requests. The valid range is 1 to 5 seconds, with a 
default of 2 seconds.