Cisco Systems UBR924 manual Cisco IOS Release 12.05T

show controllers cable-modem

Table 2	Show Controllers Cable-Modem Field Descriptions (continued)
Field		Description
TX PD ring:		Indicates the memory location of the beginning of buffer information for the transmit
		packet descriptor ring.
tx_head_pd		Indicates current head packet descriptor.
tx_tail_pd		Indicates current tail packet descriptor.
ehdr		Extended MCNS header.
MIB Statistics:
DS fifo full		Number of times the downstream input first-in first-out (FIFO) buffer became full on
		the Cisco uBR924.
rerequests		Number of times a bandwidth request generated by the Cisco uBR924 was not
		responded to by the CMTS.
DS mac msg overruns		Number of times the Cisco uBR924’s DMA controller 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 Cisco uBR924’s DMA controller had downstream data and there
		were no free data PDU buffer descriptors to accept the data.
Qualified maps		Number of times a MAP message passed all filtering requirements and was received by
		the Cisco uBR924.
Qualified syncs		Number of times a timestamp message was received by the Cisco uBR924.
CRC fails		Number of times a MAC message failed a cyclic redundancy (CRC) check.
HDR chk fails		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.
Mac msgs		Number of MAC messages received by the Cisco uBR924.
Valid hdrs		Number of valid headers received by the Cisco uBR924, including PDU headers, MAC
		headers, and headers only.
Global control and status:		Used to reset the BCM3300 chip.
interrupts:		Hexadecimal values of the pending IRQ interrupt and IRQ mask.

24Cisco IOS Release 12.0(5)T