CISCO IOS in a Nutshell

Token Ring Interfaces

Defining a token ring interface is almost as simple as defining an Ethernet interface. In addition to setting the IP address, you must specify the correct token ring speed. All devices in a ring, including devices like sniffers, must be configured for the same speed or the whole ring will shut down. There is no way for a token ring device to autosense ring speed. To set the speed, use the ring-speed command. The allowable speeds are 16 Mbps and 4 Mbps.

The other common configuration command for a token ring network, early-token-release , tells the router to release the token as soon as it has sent its packet. The default behavior is to wait for acknowledgment after sending packets, then release the token. Here’s a simple token ring configuration:

interface tokenring0
  ip address 10.10.14.1 255.255.255.0
  ring-speed 16
  early-token-release