第5个模块：实现VLAN间路由-1-描述VLAN间路由 CCNP交换部分中文版 教学课件.pptVIP

* ITAA学习情报组 汤姆一通互联网技术训练中心 /bbs 实现VLAN间路由 描述VLAN间路由 用外部路由器实现VLAN间路由 单条Trunk链路承载多个VLAN的流量（单臂路由） 路由器有多个接口，接入到对应的VLAN VLAN间路由 外部路由器配置命令 Configure on subinterface encapsulation dot1Q (or isl) 10 ip address Verify show vlan 10 show ip route 外部路由器的VLAN间路由: 802.1Q Trunk Link 外部路由器的VLAN间路由: ISL Trunk Link 验证VLAN间路由 The ping command tests connectivity to remote hosts. 验证VLAN间路由配置 Router#show ip interface brief Displays the current IP configuration per VLAN Router#show ip route Displays IP route table information Router#show vlan Displays IP address on interfaces and current state of interface 解释多层交换 Layer 2 交换转发过程 多层交换机的数据包转发逻辑 Rewritten IP Unicast Packet IP单播帧和数据包重写 Incoming IP Unicast Packet CAM Table 要求匹配全部位 匹配过程是一个2进制操作: 0 or 1 提供非常高速的查找 TCAM Table 匹配所有重要的位 匹配可以根据3种可能: 0, 1, or X (either) 掩码用表示某些内容字段的通配 总结 单臂路由使用802.1Q或ISL封装Trunk 单臂路由对应每个VLAN有1个子接口 多层交换机同时对2层和3层进行查找转发 多层交换机重写2层和3层报文头（在硬件上实现） * * Purpose: This slide discusses the solution of ISL. Emphasize: The Inter-Switch Link (ISL) protocol is used to inter-connect two VLAN-capable Fast Ethernet devices, such as the Catalyst 5000 or Cisco 7500 routers. The ISL protocol is a packet-tagging protocol that contains a standard Ethernet frame and the VLAN information associated with that frame. ISL is currently supported over Fast Ethernet links, but a single ISL link, or trunk, can carry traffic from multiple VLANs. The concept of ISL was discussed in the “Defining Common Workgroups” chapter. How to configure ISL links is discussed later in this chapter. Discuss the example in the SG. Transition: Following is a discussion of ISL links to single router. * Purpose: This figure shows the configuration of the router on a stick. Emphasize: Highlight the two different interconnecting networks, and . * Purpose: This figure shows the configuration of the router on a stick. Emphasize: Highlight the two different interconnecting networks, and . * Purpose: This slide discusses the ping command. Emphasize: Use the pi