Cisco UBR904 Troubleshooting Guide - Page 20

Command Reference Table 2 Show Controllers Cable-Modem Field Descriptions (Continued) Field Timezone Offset Config filename buffer size RX data PDU ring: rx_head rx_p RX MAC message ring: rx_head_mac rx_p_mac TX BD ring: tx_count tx_head head_txp tx_tail tail_txp TX PD ring: tx_head_pd tx_tail_pd ehdr MIB Statistics: DS fifo full rerequests DS mac msg overruns DS data overruns Qualified maps Qualified syncs CRC fails HDR chk fails Data pdus Description Correction received from the DHCP server to synchronize the cable modem time clock with the CMTS. Name of the file stored on the cable company's TFTP server that contains operational parameters for the cable modem. Size in bytes of the BCM3220 message buffers. Indicates the memory location of the beginning of buffer information for the receive data ring. Indicates current head buffer descriptor. Indicates current head packet descriptor. Indicates the memory location of the beginning of buffer information for the receive MAC message ring. Indicates current head buffer descriptor. Indicates current head packet descriptor. Indicates the memory location of the beginning of buffer information for the transmit buffer descriptor ring. If tx_count is 0, or if tx_head and tx_tail are equal and there is no change for a period of time, it means there are packets stuck on the ring. This condition may be caused by the headend not giving grants. The next packet descriptor to get used, along with its index. The next packet descriptor to get sent, along with its index. When head_txp and tail_txp are the same, the transmit queue is empty. Indicates the memory location of the beginning of buffer information for the transmit packet descriptor ring. Indicates current head packet descriptor. Indicates current tail packet descriptor. Extended MCNS header. Number of times the downstream input first-in first-out (FIFO) buffer became full on the uBR904. Number of times a bandwidth request generated by the uBR904 was not responded to by the CMTS. Number of times the uBR904's DMA controller had a downstream MAC message and there were no free MAC message buffer descriptors to accept the message. Number of times the uBR904's 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 uBR904. Number of times a timestamp message was received by the uBR904. Number of times a MAC message failed a cyclic redundancy (CRC) check. 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 uBR904. 20 Cisco IOS Release 12.0(3)T