> # TL Port

> In translative loop port (TL port) mode, an interface functions as a translative loop port. It may be connected to one or more private loop devices (NL ports). TL ports are specific to Cisco MDS 9000 Family switches and have similar properties as FL ports. TL ports enable communication between a private loop device and one of the following devices:

> - A device attached to any switch on the fabric
> - A device on a public loop anywhere in the fabric
> - A device on a different private loop anywhere in the fabric
> - A device on the same private loop

> TL ports support class 2 and class 3 services.

> Private loop devices refer to legacy devices that reside on arbitrated loops. These devices are not aware of a switch fabric because they only communicate with devices on the same physical loop (see the "TL Port ALPA Caches" topic).

> Tip We recommend configuring devices attached to TL ports in zones that have up to 64 zone members.

> Note TL port mode is not supported on Generation 2 switching module interfaces.

> Copyright 2010-2015, Cisco Systems, Inc. All rights reserved.