source route bridge是什么？
如题！<br><IMG border=0 SRC=http://www.spoto.net/bbs/images/brow/teeth_smile.gif> <IMG border=0 SRC=http://www.spoto.net/bbs/images/brow/teeth_smile.gif> <IMG border=0 SRC=http://www.spoto.net/bbs/images/brow/teeth_smile.gif> 源路由桥,这个暂时先放一放吧,三言两语不好理解.<br>IE考试内容. IBM developed Source-Route Bridging (SRB) to permit Token Ring<br>networks to connect to mainframes while maintaining scalability. The<br>essence of SRB is simple: the source station is responsible for finding the route through the bridges. Unlike transparent bridges, source-route bridges examine routing information contained in a frame to determine where to forward. Source-route bridges do not maintain a database of MAC addresses and associated ports.<br> When a station wants to communicate with another station, it first sends a local explorer. The local explorer packet traverses the local ring to see if the station is present. If the local explorer fails, the station sends out an allroutes explorer or a single-route explorer. An all-routes explorer is forwarded by all bridges; a single-route explorer is forwarded by single-route bridges. You can implement single-route bridges so that the amount of explorer traffic on the network is reduced.<br> As the explorer packet is forwarded by each bridge, information is added to the frame in the Routing Information Field (RIF). The RIF is the path description and is composed of ring numbers and bridge numbers. The destination station replies to all received explorer frames. The sending station typically selects the first route received from the destination tation and ignores all others.<br> 呵呵,SRB是ahaha最近一直在研究的,CCIE笔试考试重点内容.可以一起探讨的.注意RIF的特点.
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