A Layer 2 LAN switch with Layer 3 features can make switching decisions based on more information than just the Layer 2 MAC address. Such a switch might incorporate some Layer 3 traffic-control features, such as broadcast and multicast traffic management, security through access lists, and IP fragmentation.
A multilayer switch makes switching and filtering decisions based on OSI data link layer (Layer 2) and OSI network layer (Layer 3) addresses. This type of switch dynamically decides whether to switch (Layer 2) or route (Layer 3) incoming traffic. A multilayer LAN switch switches within a workgroup and routes between different workgroups.
Layer 3 switching allows data flows to bypass routers. The first frame passes through the router as normal to ensure that all security policies are observed. The switches watch the way that the router treats the frame and then replicate the process for subsequent frames. For example, if a series of FTP frames flows from a 10.0.0.1 to 192.168.1.1, the frames normally pass through a router. Multilayer switching observes how the router changes the Layer 2 and Layer 3 headers and imitates the router for the rest of the frames. This reduces the load on the router and the latency through the network.
參考答案:2层交换机与第三层局域网特点决定可以切换更多信息只是基于2层MAC地址. 这种开关有可能把第三层交通管制设备,如广播、组播交通管理 通过安全通道名单和IP碎裂. 切换开关、多层过滤使得基于决策系统互连数据链路层(2层)、系统互连网络层(3层)地址. 这种动态转换开关决定(2层层)或干线(3)新任交通. 局域网交换机多层交换机在专案组工作团队及路线不同. 第三层交换允许数据流绕过路由器. 首架通过正常的路由器,以确保所有安全政策得到遵守. 观看的方式,路由器交换机的帧,然后把复制过程随后帧. 举例来说,假如一连串的FTP帧源于对192.168.1.110.0.0.1、 穿过一帧通常的路由器. 多层交换路由器如何变化的观察和2层3层箱与仿作其余的路由器帧. 这可减轻负荷以通过网络路由器和潜伏期.
