chp4以太网及交换原理.ppt

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chp4以太网及交换原理

10-Gbps Ethernet 10-Gbps Ethernet (IEEE 802.3ae) was standardized in June 2002. It is a full-duplex protocol that uses only optic fiber as a transmission medium. The maximum transmission distances depend on the type of fiber being used. The future of networking media Copper (up to 1000 Mbps, perhaps more) Wireless (approaching 100 Mbps, perhaps more) Optical fiber (currently at 10,000 Mbps and soon to be more) 地址学习(Address learning) 决定转发或过滤(Forward/filter decision) 避免环路(Loop avoidance) 交换机三种功能 (Three Switch Functions ) 交换机学习主机地址 (Switche Learn Host Address) 初始MAC地址表是空的 Initial MAC address table is empty MAC address table 0260.8c01.1111 0260.8c01.2222 0260.8c01.3333 0260.8c01.4444 F0/1 F0/3 F0/2 F0/4 A B C D 交换机学习主机地址 (Switche Learn Host Address) A向C发送帧(Station A sends a frame to Station C) 交换机将A的MAC地址和其对应的接口f0/1放入MAC地址表 Switch caches station A MAC address to port E0 by learning the source address of data frames 该帧向除了F0/1接口的所有接口泛洪 The frame from station A to station C is flooded out to all ports except port F0/1 MAC address table 0260.8c01.1111 0260.8c01.2222 0260.8c01.3333 0260.8c01.4444 F0/1 : 0260.8c01.1111 F0/1 F0/3 F0/2 F0/4 D C B A 交换机学习主机地址 (Switche Learn Host Address) D向C发送帧(Station D sends a frame to station C) 交换机将D的MAC地址和其对应的接口f0/3放入MAC地址表 Switch caches station D MAC address to port f0/3 3 by learning the source Address of data frames 该帧向除了f0/3接口的所有接口泛洪 The frame from station D to station C is flooded out to all ports except port f0/3 (unknown unicasts are flooded) MAC address table 0260.8c01.1111 0260.8c01.2222 0260.8c01.3333 0260.8c01.4444 F0/1 : 0260.8c01.1111 F0/2 : 0260.8c01.2222 F0/1 F0/3 F0/2 F0/4 D C A B 交换机过滤帧( Switches Filter Frames) A向C发送帧 Station A sends a frame to station C 目的地址已知,帧不被泛洪 Destination is known, frame is not flooded 交换机的MAC地址表是基于源地址构建的 F0/1: 0260.8c01.1111 F0/2: 0260.8c01.2222 F0/3: 0260.8c01.3333 F0/4: 0260.8c01.4444 0260.8c01.1111 0260.8c01.2222 0260.8c01.3333 0260.8c01.4444 F0/1 F0/3 F0/2 F0/4 X X D C A

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