Справочник Пользователя для 3com 2000 TR

This chapter provides an introduction to Token 
Ring-in-Fast Ethernet concepts for users who are 
unfamiliar with this technology. The following sec-
tions cover:

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Token Ring-in-Fast Ethernet is a 3Com developed 
technology that encapsulates Token Ring frames in 
Fast Ethernet frames. Bridging the gap between 
Token Ring and Ethernet, this technology  offers  a 
more cost-effective integration than traditional bridg-
ing and routing, and allows Token Ring users to 
expand their bandwidth while preserving their TR 
infrastructure. 

Using Token Ring-in-Fast Ethernet technology, Fast 
Ethernet can be used as a cost-effective and scalable 
aggregation point for multiple Token Ring switch con-
nections.  In addition, because both Token Ring and 
Ethernet technologies can coexist in the same Fast 
Ethernet infrastructure, both can share to less costly 
Fast Ethernet connections.

Through a process known as tunneling (see the 
“Tunneling” section below), TR-in-FE uses Fast Ether-
net to transport natively formatted Token Ring 
frames.  This means that both source route and trans-
parent TR frames addressing information is main-
tained through Fast Ethernet (FE) so that it may be 
interpreted and utilized by either a destination Token 
Ring (TR) switch or FE server.