配置子接口-CCNA中文版PPT下载

配置子接口 点到点 子接口可以看作是一条专线 每个点到点子接口有它自己的子网 应用到星型网络中 点到多点 在NBMA网络中是用的一个子接口,不能解决水平分隔的问题 ,必须使用no split-horizon关闭水平分隔 使用单个子网 适合部分网状或全网状连接 * Purpose: This figure begins the discussion on 配置子接口. Emphasize: The encapsulation frame-relay command is assigned to the physical interface. All other configuration items, such as the network-layer address and DLCIs, are assigned to the subinterface. Multipoint may not save you addresses if you are using VLSMs. Further, it may not work properly given the broadcast traffic and split horizon considerations. The point-to-point subinterface option was created to avoid these issues. Note: Subinterfaces are also used with ATM networks and IPX LAN environments where multiple encapsulations exist on the same medium.