Cisco Systems UBR900 specifications Show controllers cable-modem

show controllers cable-modem

show controllers cable-modem

To display high-level controller information about a Cisco uBR900 series cable access router, use the show controllers cable-modemcommand in privileged EXEC mode.

show controllers cable-modem number

Syntax Description

number Controller number inside the Cisco uBR900 series.

Defaults

No default behavior or values.

Command Modes

Privileged EXEC

Command History

ReleaseModification

11.3 NA This command was introduced.

Usage Guidelines

The show controllers cable-modemdisplay 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 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.

Configuring the Cisco uBR900 Series Cable Access Routers 71