System information

Configuring the CMTS
6-11
3. Use the show ip traffic command to monitor DHCP lease query statistics, which
include the number of active, known, unknown, and unimplemented DHCP
packet transmitions.
Setting ARP Parameters
The Address Resolution Protocol (ARP) is used to build a correlation between the
cable network and the connected cable modems (CMs) and customer premises
equipment (CPE) by translating the CM and CPE’s MAC address to a logical IP
address. The collected information is dynamically stored in a table called the ARP
cache.
Follow these steps to set ARP parameters on a cable interface.
1. Enter the cable interface on which ARP is enabled.
2. Use the arp command in Interface configuration mode to specify the type of ARP
packet that is used on the BSR 64000, as shown below:
MOT(config-if)#arp [arpa | snap]
where:
arpa is entered for the standard ARP protocol.
snap is entered for the IEEE 802.3 usage of ARP.
The ARP timeout feature is used to prevent unnecessary flooding of traffic over the
cable network. ARP resolution requests are terminated after a defined interval when
attempts to resolve addressing information, for a device entry in the ARP cache table.
3. The ARP cache table expiration value is disabled by default. Use the arp timeout
command in Interface Configuration mode to set the ARP cache table expiration
value, as shown below:
MOT(config-if)#arp timeout <1-6000>
where:
1-6000 is the expiration value in minutes.
If you want to return to the default ARP timeout condition, use the no arp timeout
command in Interface Configuration mode, as shown below:
MOT(config-if)#no arp timeout