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Chapter 3
Cisco CMTS Show Commands
The following example shows how to display the devices that are generating or filtering more than 10
ARP requests for IP packets per reporting period. Repeat the command to see how quickly the device is
generating ARP packets.
Router# show cable arp-filter c3/0 ip-requests-filtered 10
Sid
2
Router#
Table 3-3
Table 3-3
Field
SID
MAC Address
IP Address
Req-Filtered
Req-For-IP-Filtered
Rep-Filtered
Note
Clearing the ARP Packet Counters
The following example shows the cable ARP counters being cleared by the clear counters cable
interface command. This can be useful because the ARP counters are 16-bit counters that can wrap
around to zero relatively quickly when large amounts of ARP traffic is being generated. Also, the ARP
packet counters could include SIDs that had forwarded large amounts of ARP traffic in the past, but that
are not currently forwarding such traffic. Clearing the counters allows you to clearly see the SIDS that
are currently forwarding the ARP traffic that is triggering the ARP filters.
Router# show cable arp cable 3/0
ARP Filter statistics for Cable3/0:
Replies Rcvd: 3278 total. 84 unfiltered, 3194 filtered
Requests Sent For IP: 941 total. 30 unfiltered, 911 filtered
Requests Forwarded: 941 total. 37 unfiltered, 904 filtered
Router# show cable arp-filter cable 5/1/0 requests-filtered 10
Sid
1
23
57
...
81
Router# clear counter cable 5/1/0
Clear "show interface" counters on this interface [confirm] y
08:17:53.968: %CLEAR-5-COUNTERS: Clear counter on interface Cable5/1/0 by console
OL-1581-08
MAC Address
IP Address
0006.2854.71e7 50.3.72.4
describes the fields shown in the display.
show cable arp-filter Detail Field Descriptions
Description
Service ID (SID) of the device.
Hardware (MAC-layer) address of the cable modem or CPE device.
IP address of the cable modem or CPE device.
Total number of ARP requests that the device has generated or forwarded.
Total number of ARP requests that the device has generated or forwarded for
IP packets.
Total number of ARP replies that the device has generated or forwarded.
The Req-Filter and Rep-Filtered counters are 16-bit counters, with a maximum value of 65,535
packets. If the number of packets exceeds this amount, the counter wraps back to zero and
begins incrementing again.
MAC Address
IP Address
0006.2854.72d7 10.3.81.4
0007.0e02.b747 10.3.81.31
0007.0e03.2c51 10.3.81.31
00C0.c726.6b14 10.3.81.31
Req-Filtered
Req-For-IP-Filtered
0
1926
Req-Filtered
Req-For-IP-Filtered
8
0
32
0
12407
0
23
0
Cisco Broadband Cable Command Reference Guide
show cable arp-filter
Rep-Filtered
0
Rep-Filtered
0
0
0
0
3-9
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