Cisco Systems IC-23 Dedicated Token Ring Port Adapter, Specifying a Token Ring Interface, IC-59

Configuring LAN Interfaces

Configuring a Token Ring Interface

Dedicated Token Ring Port Adapter

The Dedicated Token Ring port adapter (PA-4R-DTR) is available on Cisco 7500 series routers, Cisco 7200 series routers, and Cisco 7000 series routers with the 7000 Series Route Switch Processor (RSP7000) and 7000 Series Chassis Interface (RSP7000CI).

The PA-4R-DTR provides up to four IBM Token Ring or IEEE 802.5 Token Ring interfaces. Each Token Ring interface can be set for 4 Mbps or 16 Mbps half-duplex or full-duplex operation and can operate as a standard Token Ring station or as a concentrator port. The default for all interfaces is Token Ring station mode with half-duplex 16-Mbps operation. The PA-4R-DTR connects over Type 1 lobe or Type 3 lobe cables, with each interface providing an RJ-45 receptacle.

Token Ring Interface Configuration Task List

Perform the tasks in the following sections to configure a Token Ring interface:

•Specifying a Token Ring Interface (Required)

•Enabling Early Token Release (Optional)

•Configuring PCbus Token Ring Interface Management (Optional)

•Enabling Token Ring Concentrator Port (Optional)

•Monitoring and Maintaining the Port (Optional)

Specifying a Token Ring Interface

To specify a Token Ring interface and enter interface configuration mode, use one of the following commands in global configuration mode:

Command	Purpose
interface tokenring number	Begins interface configuration.
interface tokenring slot/port	Begins interface configuration for the Cisco 7200 or Cisco 7500 series routers.
interface tokenring	Begins interface configuration for the Cisco 7500 series routers.
slot/port-adapter/port

Enabling Early Token Release

Cisco Token Ring interfaces support early token release, a method whereby the interface releases the token back onto the ring immediately after transmitting rather than waiting for the frame to return. This feature can help to increase the total bandwidth of the Token Ring. To configure the interface for early token release, use the following command in interface configuration mode:

Command	Purpose
early-token-release	Enables early token release.

Cisco IOS Interface Configuration Guide

IC-59