虚拟局域网技术在机房局域网中的应用

Application of VLAN in Local Area Network

随着局域网规模的不断扩大,用户数量不断增加,网络变得越来越拥挤,冲突不断产生,如何有效地提高网络使用效率和网络管理的灵活性来保障网络运行的安全,这都是亟待解决的课题。VLAN技术可以把一个LAN划分成多个逻辑的LAN——VLAN,每个VLAN是一个广播域,VLAN内的主机间通信就和在一个LAN内一样,而VLAN间则不能直接互通,这样广播报文被限制在一个VLAN内,从而有效解决了因为子网过大而造成的IP地址冲突等故障现象,保证了网络运行的稳定性和安全性。

With the constant expansion of local area network,the number of users has increased and network applications keep growing.Therefore,the network is becoming increasingly crowded,and conflicts arise.It＇s increasingly difficult to effectively improve the flexibility,efficiency and security of network management.VLAN technologies are mainly applied to solve the problem that the switches fail to restrict broad cast in interconnection of local area network.This technology can divide a LAN into multiple logical LAN-VLAN,and each VLAN is a broadcast domain.Communication between the VLANs works the in same way as in a single LAN,while the VLAN can not communicate directly with each other.Therefore,broadcast packet is restricted in one VLAN,the problems like IP conflict caused by excessive subnet will be effectively solved,and the stability and security of network will be guaranteed.