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Cisco IOS Release 12.0(5)T
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 7 describes the software MAC address filter information for the cable access router interface.
DS Data Overruns Number of times the Cisco uBR924’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 uBR924.
Received Syncs Number of times a timestamp message was received by the Cisco uBR924.
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 uBR924.
DS MAC messages Number of MAC messages received by the Cisco uBR924.
Valid Headers Number of valid headers received by the Cisco uBR924, including PDU headers,
MAC headers, and headers only.
Sync losses Number of times the Cisco uBR924 lost timebase sync with the CMTS.
Pulse losses Number of times the Cisco uBR924 did not receive expected timestamp messages
from the CMTS.
BW request failures Number of times the Cisco uBR924 sent the maximum number of re-requests for
bandwidth allocation and the request was still not granted.
Table 7 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.
Table 6 Show Interfaces Cable-Modem Counters Descriptions (continued)
Field Description