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show interfaces cable-modem
DS MAC Message Overruns: 0
DS Data Overruns
Received MAPs
Received Syncs
Message CRC failures
Header CRC failures
Data PDUs
DS MAC messages
Valid Headers
Sync losses
Pulse losses
BW request failures
Router#
Table 6-32
Table 6-32 Counters Shown in show interfaces cable-modem counters Display
Field
Ranging requests sent
Downstream FIFO full
Re-requests
DS MAC Message
Overruns
DS Data Overruns
Received MAPs
Received Syncs
Message CRC failures
Header CRC failures
Data PDUs
DS MAC messages
Valid Headers
Sync losses
Pulse losses
BW request failures
Cisco Broadband Cable Command Reference Guide
6-170
: 0
: 254339485
: 53059555
: 0
: 1394
: 5853
: 307861745
: 307869065
: 0
: 1
: 6
describes the counters shown in this display.
Description
Number of ranging requests sent by the router to the CMTS.
Number of times the downstream input first-in first-out (FIFO) buffer
became full on the router.
Number of times a bandwidth request generated by the router was not
responded to by the CMTS.
Number of times the DMA controller had a downstream MAC message
and there were no free MAC message buffer descriptors to accept the
message.
Number of times the DMA controller had downstream data and there were
no free data PDU buffer descriptors to accept the data.
Number of times a MAP message passed all filtering requirements and
was received by the router.
Number of times a time-stamp message was received by the router.
Number of times a MAC message failed a cyclic redundancy check
(CRC).
Number of times a MAC header failed its 16-bit CRC check. The MAC
header CRC is a 16-bit Header Check Sequence (HCS) field that ensures
the integrity of the MAC header even in a collision environment.
Total number of data PDUs (protocol data units) of all types received by
the router.
Number of MAC messages received by the router.
Number of valid headers received by the router, including PDU headers,
MAC headers, and headers only.
Number of times the router lost timebase sync with the CMTS.
Number of times the router did not receive expected timestamp messages
from the CMTS.
Number of times the router sent the maximum number of re-requests for
bandwidth allocation and the request was still not granted.
Chapter 6
Cable CPE Commands
OL-1581-07
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