计算机网络第9章：局域网交换与VLAN幻灯片.ppt

* Layer 1 of 2 Emphasize: Each VLAN has a unique, four-digit number that can be from 1 to 1001. To add a VLAN to the VLAN database, the minimum parameter required is the VLAN number. * Layer 1 of 2 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Routing Between VLANs Routing Between VLANs Subinterfaces Configuring Inter-VLAN Routing Step3: Assign an IP address to the interface Step1: Identify the interface. Router(config)#interface fastethernet port-number. subinterface-number Step2: Define the VLAN encapsulation. Router(config-if)#encapsulation dot1q vlan-number Router(config-if)#ip address ip-address subnet-mask Sydney(config)#interface FastEthernet 0/0 Sydney(config-if)#full duplex Sydney(config-if)#no shut Sydney(config-if)#interface FastEthernet 0/0.1 Sydney(config-subif)#encapsulation 802.1q 1 Sydney(config-subif)#ip address 192.168.1.1 255.255.255.0 Sydney(config-if)#interface FastEthernet 0/0.2 Sydney(config-subif)#encapsulation 802.1q 20 Sydney(config-subif)#ip address 192.168.2.1 255.255.255.0 Sydney(config-if)#interface FastEthernet 0/0.3 Sydney(config-subif)#encapsulation 802.1q 30 Sydney(config-subif)#ip address 192.168.3.1 255.255.255.0 Configuring Inter-VLAN Routing * * * * * * * * * * * * * * * * * * * * * * * * * * Switching The Spanning-Tree Protocol VLAN Introduction of VLAN VLAN Architecture VLAN Implementation Routing Between VLANs Table of Contents Existing Shared LAN Configurations In a typical shared LAN... Users are grouped physically based on the hub they are plugged into Routers segment the LAN and provide broadcast firewalls In VLANs... you can group users logically by function, department or application in use configuration is done through proprietary software Differences between LANs VLANs VLANs... work at Layer 2 3 control network broadcasts allow users to be assigned by net admin. provide tighter network security. How? VLANs (IEEE 802.1q) Characteristics A logical grouping of network devices o