You want to configure a Token Ring interface.
The main thing that you need 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)#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)#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)#end Router8#
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 16Mbps. In this example, we have reduced the speed to support the older 4Mbps 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—it will also disrupt communications among all of the other devices.
Changing MAC addresses in Token Ring networks is considerably more common than it is for Ethernet. However, as we mentioned in Recipe 16.9, you need to ensure that all MAC addresses are unique:
Router2(config-if)#mac-address 0006.1111.aaaa
Full-duplex support on Token Ring interfaces is not actually part of the IEEE standard, but many vendors have started to support it. Only a few of Cisco's Token Ring modules that are specifically designed for full-duplex support offer this command. However, if you have a router with this feature and a Token Ring switch that also supports it, full-duplex can significantly improve your network performance.
You can enable full-duplex support, where available, with the full-duplex command:
Router8(config-if)#full-duplex
The default is half-duplex.
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