Syntax Description; Command Mode; Usage Guidelines - Cisco UBR904 - Router - EN Troubleshooting Tips

show controllers cable-modem
To display high-level controller information about a cable modem, use the show controllers
cable-modem command in privileged EXEC mode.

Syntax Description

number

Command Mode

Privileged EXEC

Usage Guidelines

This command first appeared in Cisco IOS Release 11.3 NA.
The show controllers cable-modem display begins with information from the first few registers of
the Broadcom BCM3220 chip. Next is buffer information for the receive, receive MAC message,
buffer descriptor, and packet descriptor rings. Then comes MIB statistics from the BCM3220 chip,
DMA base registers to indicate where the rings start, global control and status information, and
finally interrupts for the interrupt code.
When using this command, be sure to check the tx_count and the tx_head and tx_tail values for the
buffer descriptor (TX BD) and packet descriptor (TX PD) rings. The tx_count should be greater than
0, and the tx_head and tx_tail values should not be equal. If these values do not change for a long
period of time, it indicates there are packets stuck on the ring. This condition is often caused by the
headend not giving grants.
Examples
Following is a sample output for this command:
show controllers cable-modem number
Controller number inside the cable modem.
uBR904# show controllers cable-modem 0
BCM Cable interface 0:
BCM3220 unit 0, idb 0x200EB4, ds 0x82D4748, regaddr = 0x800000, reset_mask 0x80
station address 0010.7b43.aa01
PLD VERSION: 32
MAC State is ranging_2_state, Prev States = 7
MAC mcfilter 01E02F00
DS: BCM 3116 Receiver: Chip id = 2
US: BCM 3037 Transmitter: Chip id = 30B4
Tuner: status=0x00
Rx: tuner_freq 699000000, symbol_rate 5055849, local_freq 11520000
snr_estimate 33406, ber_estimate 0, lock_threshold 26000
QAM in lock, FEC in lock, qam_mode QAM_64
Tx: tx_freq 20000000, power_level 0x3E, symbol_rate 1280000
DHCP: TFTP server = 4.0.0.32, TOD server = 4.0.0.188
Security server = 0.0.0.0, Timezone Offest = 0.0.4.32
Config filename =
buffer size 1600
default station address 0010.7b43.aa01
data mcfilter 01000000
Troubleshooting Tips for the Cisco uBR904 Cable Modem 17
show controllers cable-modem