Cisco Broadband Cable Command Reference Guide

Chapter 5 Cable CPE Commands
show controllers cable-modem
Syntax Description
Command Modes Privileged EXEC
Command History
OL-1581-05
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
show controllers cable-modem number [all]
number Identifies the cable interface (always 0).
all (Optional) Displays the output for all forms of this command:
show controllers cable-modem bpkm
show controllers cable-modem des
show controllers cable-modem filters
show controllers cable-modem lookup-table
show controllers cable-modem mac
show controllers cable-modem phy
show controllers cable-modem qos
show controllers cable-modem tuner
Release Modification
11.3(4)NA This command was introduced for the Cisco uBR904 cable access router.
12.0(4)XI1 Support was added for the Cisco uBR924 cable access router.
12.1(3)XL Support was added for the Cisco uBR905 cable access router.
12.1(5)XU1 Support was added for the Cisco CVA122 Cable Voice Adapter.
12.2(2)XA Support was added for the Cisco uBR925 cable access router.
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.
Cisco Broadband Cable Command Reference Guide
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