交换网络基础课件

1、交换网络基础Page 2前言常见的以太网设备包括Hub、交换机等。交换机工作在数据链路层，它有效地隔离了以太网中的冲突域，极大地提升了以太网的性能。Page 3学习目标 学完本课程后，您应该能：掌握交换机的基本工作原理掌握交换机的基本配置小型交换网络Page 4SWA主机A主机C主机BIP: 10.1.1.1/24MAC:00-01-02-03-04-AAIP: 10.1.1.2/24MAC:00-01-02-03-04-BBIP: 10.1.1.3/24MAC:00-01-02-03-04-CC交换机工作在数据链路层，转发数据帧。G0/0/1G0/0/2G0/0/3交换机的转发行为Page

2、5泛洪（Flooding）转发（Forwarding）丢弃（Discarding）Page 6交换机初始状态Page 7SWAIP: 10.1.1.1/24MAC:00-01-02-03-04-AAIP: 10.1.1.2/24MAC:00-01-02-03-04-BBIP: 10.1.1.3/24MAC:00-01-02-03-04-CC初始状态下，交换机MAC地址表为空。主机A主机C主机BG0/0/1G0/0/2G0/0/3MAC地址表MAC接口学习MAC地址Page 800-01-02-03-04-AAFF-FF-FF-FF-FF-FFARPDec.MacSrc.MacSWAIP: 10

3、.1.1.1/24MAC:00-01-02-03-04-AAIP: 10.1.1.2/24MAC:00-01-02-03-04-BBIP: 10.1.1.3/24MAC:00-01-02-03-04-CCG0/0/1G0/0/2G0/0/3MAC接口00-01-02-03-04-AAG0/0/1交换机将收到的数据帧的源MAC地址和对应接口记录到MAC地址表中。主机A主机C主机BMAC地址表MAC接口00-01-02-03-04-AAG0/0/1转发数据帧Page 900-01-02-03-04-AAFF-FF-FF-FF-FF-FFARPSWAIP: 10.1.1.1/24MAC:00-01-

4、02-03-04-AAIP: 10.1.1.2/24MAC:00-01-02-03-04-BBIP: 10.1.1.3/24MAC:00-01-02-03-04-CC当数据帧的目的MAC地址不在MAC表中，或者目的MAC地址为广播地址时，交换机会泛洪该帧。主机A主机C主机BG0/0/1G0/0/2G0/0/3Dec.MacSrc.MacMAC地址表目标主机回复Page 10MAC接口00-01-02-03-04-AAG0/0/100-01-02-03-04-CCG0/0/300-01-02-03-04-AA00-01-02-03-04-CCARPSWAIP: 10.1.1.1/24MAC:00

5、-01-02-03-04-AAIP: 10.1.1.2/24MAC:00-01-02-03-04-BBIP: 10.1.1.3/24MAC:00-01-02-03-04-CC交换机根据MAC地址表将目标主机的回复信息单播转发给源主机。主机A主机C主机BG0/0/1G0/0/2G0/0/3Dec.MacSrc.MacMAC地址表基本配置Page 11system-view Enter system view, return user view with Ctrl+Z.SWAinterface GigabitEthernet 0/0/1SWA-GigabitEthernet0/0/1undo negotiation autoSWA-GigabitEthernet0/0/1speed 100SWA-GigabitEthernet0/0/1duplex fullSWAG0/0/1主机A配置验证Page 12SWAG0/0/1SWAdisplay interface GigabitEthernet 0/0/1GigabitEthernet0/0/1 current state : UPLine protocol current state : UPSpeed : 100, Loopback: N