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Chapter 6
Cable CPE Commands
show controllers cable-modem
To display high-level controller information for the router's cable interface, use the show controllers
cable-modem command in privileged EXEC mode.
Cisco uBR904, uBR905, uBR924, uBR925 cable access routers, Cisco CVA122 Cable Voice Adapter
Syntax Description
number
all
Command Modes
Privileged EXEC
Command History
Release
11.3(4)NA
12.0(4)XI1
12.1(3)XL
12.1(5)XU1
12.2(2)XA
Usage Guidelines
The show controllers cable-modem display begins with information from the first few registers of the
Broadcom BCM3300 chip. Next is buffer information for the receive, receive MAC message, buffer
descriptor, and packet descriptor rings. Then comes MIB statistics from the BCM3300 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 several minutes, it could
indicate that there are packets stuck on the ring. This condition is often caused by the CMTS not giving
grants.
Examples
The following shows typical output for the show controllers cable-modem command:
Router# show controllers cable-modem 0
BCM Cable interface 0:
BCM3300 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
OL-1581-07
show controllers cable-modem number [all]
Identifies the cable interface (always 0).
(Optional) Displays detailed, multi-page output, including chip-level settings,
transmit and receive ring contents, and MAC-layer and PHY-layer registers and
buffers.
Modification
This command was introduced for the Cisco uBR904 cable access router.
Support was added for the Cisco uBR924 cable access router.
Support was added for the Cisco uBR905 cable access router.
Support was added for the Cisco CVA122 Cable Voice Adapter.
Support was added for the Cisco uBR925 cable access router.
data mcfilter 01000000
default station address 0010.7b43.aa01
Cisco Broadband Cable Command Reference Guide
show controllers cable-modem
6-69
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