Cabletron Systems 3T02-04 - Manual (Page 49)

Source Routing Transparent Bridging
Token Ring Switch Module User Guide Page B-5
B.4 SOURCE ROUTING TRANSPARENT BRIDGING
Source Routing Transparent (SRT) bridging is a method that merges
IBM-style source routing with transparent spanning tree bridging. If a
route is present in a packet, then the bridge uses it; otherwise the bridge
applies transparent learning rules. It represents an attempt by the IEEE
standards committee to standardize source routing and correct some
shortcomings in source routing (notably multicast transmission). IEEE
has defined SRT bridging for Token Rings, and ANSI has incorporated it
into the FDDI standards. The ATX supports SRT bridging on these, as
well as on Ethernet (for Ethernet, there is no such standard; the ATX
provides this as a proprietary backbone service).