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Configuring LAN Interfaces

Configuring a Fiber Distributed Data Interface

IC-43

Cisco IOS Interface Configuration Guide

Controlling the CMT Microcode

You can control whether the CMT onboard functions are on or off. The FIP provides CMT functions in

microcode. These functions are separate from those provided on the processor card and are accessed

through EXEC commands.

The default is for the FIP CMT functions to be on. A typical reason to disable is when you work with

new FDDI equipment and have problems bringing up the ring. If you disable the CMT microcode, the

following actions occur:

• The FIP CMT microcode is disabled.

• The main system code performs the CMT function while debugging output is generated.

To disable the CMT microcode, use the following command in interface configuration mode:

Starting and Stopping FDDI

In normal operation, the FDDI interface is operational once the interface is connected and configured.

You can start and stop the processes that perform the CMT function and allow the ring on one fiber to

be stopped. To do so, use either of the following commands in EXEC mode:

Do not use either of the preceding commands during normal operation of FDDI; they are used during

interoperability tests.

Setting FDDI Frames Per Token Limit

The FDDI interface is able to transmit multiple frames per token on a Cisco 4000, Cisco 4500, and a

Cisco 4700 series routers, instead of only a single frame at a time. You can specify the maximum number

of frames to be transmitted with each token capture. This significantly improves your throughput, when

you have heavy or very bursty traffic.

To configure the FDDI interface to transmit a maximum number of frames per token capture, use the

following commands:

Command Purpose

no fddi if-cmt

Disables the FCIT CMT functions.

Command Purpose

cmt connect [interface-name [phy-a | phy-b]]

Starts CMT processes on FDDI ring.

cmt disconnect [interface-name [phy-a | phy-b]]

Stops CMT processes on FDDI ring.

Command Purpose

Step 1

configure terminal

Enters global configuration mode.

Step 2

interface fddi0

Enters interface configuration mode.

Step 3

fddi ?

Shows fddi command options.

Step 4

fddi frames-per-token ?

Shows fddi frames-per-token command options.

Step 5

fddi frames-per-token number

Specifies the maximum number of frames to be transmitted per

token capture.

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