Cisco IOS Cookbook, 2nd Edition

Configuring Token Ring Interface Features

Problem

You want to configure a Token Ring interface.

Solution

The main thing that you need to take care to set properly for Token Ring interfaces is the ring speed:

Router2#configure terminal 
Enter configuration commands, one per line.  End with CNTL/Z.
Router2(config)#interface TokenRing0
Router2(config-if)#ring-speed 4
Router2(config-if)#exit
Router2(config)#end
Router2#

You can also set the MAC address on a Token Ring interface:

Router2#configure terminal 
Enter configuration commands, one per line.  End with CNTL/Z.
Router2(config)#interface TokenRing0
Router2(config-if)#mac-address 0006.1111.aaaa
Router2(config-if)#exit
Router2(config)#end
Router2#

And some routers can optionally support full-duplex Token Ring:

Router8#configure terminal 
Enter configuration commands, one per line.  End with CNTL/Z.
Router8(config)#interface TokenRing0/8
Router8(config-if)#full-duplex
Router8(config-if)#exit
Router8(config)#end
Router8#

Discussion

You can set the Token Ring’s ring speed with the ring-speed command:

Router2(config)#interface TokenRing0
Router2(config-if)#ring-speed 4

The default for Token Ring interfaces is 16 Mbps. In this example, we have reduced the speed to support the older 4 Mbps standard. You need to be very careful when doing this, however, because ring speed mismatches can cause serious problems on Token Ring networks. Inserting a device with the wrong ring speed not only means that the new device can’t use the ring, but it will disrupt ...