show interfaces cable-modem

Table 18

show interfaces cable-modem Counters Descriptions (continued)

 

 

 

Field

 

Description

 

 

DS Data Overruns

Number of times the Cisco uBR900 series’s DMA controller had downstream data

 

 

and there were no free data PDU buffer descriptors to accept the data.

 

 

Received MAPs

Number of times a MAP message passed all filtering requirements and was received

 

 

by the Cisco uBR900 series.

 

 

Received Syncs

Number of times a timestamp message was received by the Cisco uBR900 series.

 

 

Message CRC failures

Number of times a MAC message failed a cyclic redundancy (CRC) check.

 

 

Header CRC failures

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.

 

 

 

Data PDUs

 

Total number of data PDUs (protocol data units) of all types received by the

 

 

Cisco uBR900 series.

 

 

DS MAC messages

Number of MAC messages received by the Cisco uBR900 series.

 

 

 

Valid Headers

 

Number of valid headers received by the Cisco uBR900 series, including PDU

 

 

headers, MAC headers, and headers only.

 

 

 

Sync losses

 

Number of times the Cisco uBR900 series lost timebase sync with the CMTS.

 

 

 

Pulse losses

 

Number of times the Cisco uBR900 series did not receive expected timestamp

 

 

messages from the CMTS.

 

 

BW request failures

Number of times the Cisco uBR900 series sent the maximum number of re-requests

 

 

for bandwidth allocation and the request was still not granted.

 

 

 

Information about routing and bridging protocols and filtering on the cable access router interface is displayed in the following example:

uBR924# show int cable-modem 0 crb

cable-modem0

Bridged protocols on cable-modem0: ip

Software MAC address filter on cable-modem0

 

Hash Len

Address

Matches

Act

Type

0x00:

0

ffff.ffff.ffff

3877

RCV Physical broadcast

0x2A:

0

0900.2b01.0001

0

RCV DEC spanning tree

0x7A:

0

0010.7b43.aa01

573

RCV Interface MAC address

0xC2:

0

0180.c200.0000

0

RCV IEEE spanning tree

0xC2:

1

0180.c200.0000

0

RCV IBM spanning tree

Table 19 describes the software MAC address filter information for the cable access router interface.

Table 19

show interfaces cable-modem Routing and Bridging Descriptions

 

 

Field

Description

 

 

Hash

Hash key/relative position in the keyed list for this MAC address filter.

 

 

Len

Length of this entry to the beginning element of this hash chain.

 

 

Address

Canonical (Ethernet ordered) MAC address of this filter.

 

 

Matches

Number of received packets that match this MAC address.

 

 

116Cisco IOS Release 12.0(7)T

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Cisco Systems UBR900 specifications UBR924# show int cable-modem 0 crb