三层交换机实现不同网段的主机通信.doc

三层交换机实现不同网段的主机通信【实验名称】办公广播网处理，三层交换机实现不同VLAN之间的通信【实验目的】用三层交换机将多台计算机连接起来，构建一个小型的办公网，且实现vlan间的通信。技术原理： 三层交换机具有网络层的功能，实现vlan相互访问的原理是：利用3层交换机的路由功能，通过识别数据包的IP地址，查找路由表进行进行选路转发。三层交换机利用直接路由可以实现不同vlan之间的互相访问。三层交换机给接口配置IP地址，采用SVI (交换虚拟接口)的方式实现VLAN间互连，SVI是指为交换机中的VLAN创建虚拟接口，并且配置IP地址。【背景描述】【需求分析】【实验拓扑】【实验设备】三层交换机1台PC机3台【实验步骤】按照网络拓扑连接好网络设备，然后进行如下配置SwitchSwitchenableSwitch#config terminalEnter configuration commands, one per line. End with CNTL/Z.Switch(config)#vlan 10Switch(config-vlan)#name xiaoxueSwitch(config-vlan)#exitSwitch(config)#vlan 20Switch(config-vlan)#name chuzhongSwitch(config-vlan)#exitSwitch(config)#vlan 30Switch(config-vlan)#name gaozhongSwitch(config-vlan)#exitSwitch(config)#interface fa0/1Switch(config-if)#switchport mode access Switch(config-if)#switchport access vlan 10%LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to downSwitch(config-if)#exitSwitch(config)#interface fa0/2Switch(config-if)#switchport mode accessSwitch(config-if)#switchport access vlan 20%LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan3, changed state to doSwitch(config-if)#exitSwitch(config)#interface fa0/3Switch(config-if)#switchport mode accessSwitch(config-if)#switchport access vlan 30%LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan4, changed state to downSwitch(config-if)#exitSwitch(config)#interface vlan 10%LINK-5-CHANGED: Interface Vlan10, changed state to up%LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan10, changed state to upSwitch(config-if)#ip address 192.168.10.1 255.255.255.0% 192.168.10.0 overlaps with Vlan2Switch(config-if)#exitSwitch(config)#interface vlan 20%LINK-5-CHANGED: Interface Vlan20, changed state to up%LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan20, changed state to upSwitch(config-if)#ip address 192.168.20.1 255.255.255.0% 192.168.20.0 overlaps with Vlan3Switch(config-if)#exitSwitch(config)#interface vlan 30%LINK-5-CHANGED: Interface Vlan30, changed state to up%LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan30, changed state to upSwitch(config-if)#ip address 192.168.30.1 255.255.255.0% 192.168.30.0 overlaps with Vlan4Switch(config-if)#exitSwitch(config)#exitSwitch#%SYS-5-CO