1.说明 Cisco的4908-l3的配置比较繁杂，通过IRB来实现不同桥接组之间的通讯 可以与trunk互连 但是，要对每个单独的桥接组进行封装。本实例中主要介绍在一个基于4908为中心，3500为二级交换机的园区网方案设计以及每个设备的调试过程等。着重介绍4908的配置过程 至于3500的配置请见 基本配置栏目中 关于 3500全系列配置的文章。在此，不赘述！ 至于vlan分配等，通过基本配置自己体会吧 呵呵！ 2.拓扑图 3.4908_Center_A 配置 User Access Verification Password: Password: Center_A>en Password: Center_A#sho run Building configuration... Current configuration: version 12.0 no service pad service timestamps debug uptime service timestamps log uptime no service password-encryption hostname Center_A enable secret 5 $1$OHq9$9XvRCkMWcYtsC4glw.NYG. enable password cisco ip subnet-zero no ip domain-lookup bridge irb (启用IRB 有点儿象 Ip routing) ! interface GigabitEthernet1 no ip address no ip directed-broadcast 对物理端口不做配置，通过子接口进行封装。从下面对子接口的封装可以看出G1下面有三个bridge group (1、40、50) interface GigabitEthernet1.1 encapsulation isl 1 no ip redirects no ip directed-broadcast bridge-group 1 interface GigabitEthernet1.40 encapsulation isl 40 no ip redirects no ip directed-broadcast bridge-group 40 interface GigabitEthernet1.50 encapsulation isl 50 no ip redirects no ip directed-broadcast bridge-group 50 接着进入g2的配置 interface GigabitEthernet2 no ip address no ip directed-broadcast interface GigabitEthernet2.1 encapsulation isl 1 no ip redirects no ip directed-broadcast bridge-group 1 interface GigabitEthernet2.10 encapsulation isl 10 no ip redirects no ip directed-broadcast bridge-group 10 interface GigabitEthernet2.20 encapsulation isl 20 no ip redirects no ip directed-broadcast bridge-group 20 interface GigabitEthernet2.30 encapsulation isl 30 no ip redirects no ip directed-broadcast bridge-group 30 interface GigabitEthernet2.40 encapsulation isl 40 no ip redirects no ip directed-broadcast bridge-group 40 interface GigabitEthernet2.50 encapsulation isl 50 no ip redirects no ip directed-broadcast bridge-group 50 interface GigabitEthernet3 no ip address no ip directed-broadcast interface GigabitEthernet3.1 encapsulation isl 1 no ip redirects no ip directed-broadcast bridge-group 1 interface GigabitEthernet3.150 encapsulation isl 150 no ip redirects no ip directed-broadcast bridge-group 150
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