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Bridging between Token Ring and Ethernet Port Cisco2612 Router

Unanswered Question
Sep 19th, 2002
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Hi,

to bridge between the ToRi and Ethernet Port on a 2612 Router, do I need

a special IOS Release and MEM upgrade, or can it be done with the IP only.

Thanks

Richard

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rsissons Thu, 09/19/2002 - 21:12
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That depends on what kind of bridging you want to do. Most token ring applications use source route bridging. To convert from that to ethernet format, you require the source bridge translational function which requires the IBM feature set.


The following URL describes how to configure this feature


http://www.cisco.com/warp/customer/100/48.shtml


You can configure transparant bridging between ethernet and token ring with the IP only feature set, but it does have some limitations due the the way that the addresses are put onto the lans in reversed format when going from token ring to ethernet and vice versa.


This means that any frames that contain mac addresses in the data portion, such as ARP frames, will receive them in the wrong format.


The bitswap-layer3-address parameter on the brigde-group command was introduced specifically to bitswap this address but for ARP frames only. Other protocols, such as DHCP, will not work.

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