园区交换式网络的组建—接入层与汇聚层.doc

园区交换式网络的组建—接入层与汇聚层 摘 要 局域网组建普遍采用包括核心层、汇聚层、接入层的三层交换网络模型其中三层交换和愕娜技术被广泛应用于各种网络中主机通过和这种结构的交换式局域网的连接，同外网进行通信和数据的交流。在每一层中都按照虚拟局域网对端口进行相应VLAN划分，以设立网关，方便对交换机不同VLAN的端口信息交流进行控制。核心层的高速转发的性能，为能够把在汇聚层所汇聚的网内大量数据和信息与外网进行安全快速的通信创造了条件。实现该性能， 需要在核心层交换机按照ARRP协议进行分组连接，按优先级的高低选定这层中即将用于和外网进行通信的交换机，以及作为备份的交换机，当然，这于整个通信过程来说是透明的，在整个系统看来它只是根据不同的VLAN选择了不同的ARRP组来对数据进行转发，其中的路由选择由核心层独立完成。 关键词：交换机 ,路由器,三层交换，VLAN技术，ARRP分组，转发 Park exchange network design and practice —Access Layer，Distribution Layer Abstract The local area network sets up generally uses including the core layer, the distribution layer, the access layer three exchanges network model, Three exchange Is widely applied with the VLAN technology in each kind of network Main engine through and this kind of structure exchange type local area network connection, Carries on the correspondence and the data exchange with the outside net. All defers to the virtual local area network in each to carry on the corresponding VLAN division to the port, sets up the gateway, and facilitates carries on the control to the switchboard different VLAN port information exchange. The core layer high speed retransmits the performance, for could in the net which gathered in the distribution layer institute the mass dates and the information with the outside net carries on the safe fast correspondence to create the condition. Realizes this performance, needs to carry on the grouping connection in the core layer switchboard according to the ARRP agreement, according to the priority height designated in this soon uses in with the outside net to carry on the correspondence the switchboard, as well as the backup switchboard, certainly, this to the entire course of communications said is transparent, in the overall system looked like it only was chooses the different ARRP group according to different VLAN to come the logarithm according to carry on retransmits, routing completed by the core layer independence. Key words: Switch,Router,Three exchang