Specifications

DOCSIS 1.1 for Cisco uBR905 and Cisco uBR925 Cable Access Routers and Cisco CVA122 Cable Voice Adapters

Command Reference

Cisco IOS Release 12.2(15)CZ

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profile 3:

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Router#

Table 8 describes the MIB statistics shown in the display for this command.

Below the MIB statistics in the show controllers cable-modem 0 mac hardware display, the BCM3300

registers section shows the DMA locations of the indicated processing routines of the Broadcom 3220

MAC chip within the router.

The following is typical output from the show controllers cable-modem mac state command that

summarizes the state of the cable MAC layer and provides a list of downstream search frequency bands

and the order in which they are searched. The normal operational state of the interface is the

maintenance_state. If the cable MAC layer is in the wait_for_link_up_state, the information shown in

the display corresponds to the last time the interface was up.

Router# show controller cable-modem 0 mac state

MAC State: maintenance_state

Table 8 MIB Statistics Field Descriptions

Field Description

DS fifo full Number of times the downstream receive buffer on the router has become

full.

Rerequests Number of registration requests sent by the router to the CMTS.

DS mac msg overruns Number of times the Direct Memory Access (DMA) controller has had a

downstream MAC message and there were no free MAC message buffer

descriptors to accept the message.

DS data overruns Number of times the DMA controller has had downstream data and there

were no free data protocol data unit (PDU) buffer descriptors to accept the

data.

Qualified maps Number of valid MAP messages received by the router.

Qualified syncs Number of times the router has received synchronization with the

downstream channel.

CRC fails Number of cyclic redundancy checks (CRCs) generated by the far-end

device that did not match the checksums calculated from the message

portions of the packets received.

HDR check fails Number of cyclic redundancy checks (CRCs) generated by the far-end

device that did not match the checksums calculated from the MAC headers

of the packets received. 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.

Data pdus Total number of data PDUs of all types received by the cable interface.

Mac msgs Number of MAC messages received by the cable interface.

Valid hdrs Number of valid MAC headers received by the cable interface.