第5次-交换.pptVIP

* Type 0 表示keepalive 消息 Type 1 Inverse ARP 消息 0x2 -- Active 0x0 -- Inactive 0x4 -- Delete Status of the PVC. The DCE device reports the status, and the DTE device receives the status. When you disable the Local Management Interface (LMI) mechanism on the interface (by using the no keepalive command), the PVC status is STATIC. Otherwise, the PVC status is exchanged using the LMI protocol: ?STATIC—LMI is disabled on the interface. ?ACTIVE— The PVC is operational and can transmit packets. ?INACTIVE—The PVC is configured, but down. ?DELETED—The PVC is not present (DTE device only), which means that no status is received from the LMI protocol. * 关于full LMI status message 的课文描述： Basically, the LMI is a keepalive mechanism that provides status information about Frame Relay connections between the router (DTE) and the Frame Relay switch (DCE). Every 10 seconds or so, the end device polls the network, either requesting a dumb sequenced response or channel status information. If the network does not respond with the requested information, the user device may consider the connection to be down. When the network responds with a FULL STATUS response, it includes status information about DLCIs that are allocated to that line. The end device can use this information to determine whether the logical connections are able to pass data. Type 0 表示keepalive 消息 Type 1 Inverse ARP 消息 0x2 -- Active 0x0 -- Inactive 0x4 -- Delete * 第三章的总结知识点参考教材3.6.1.2的flash * TDM DLCI在同一物理设备上不能重复，但是局部的 PVC是永久的 SVC是有业务的时候才建立 物理接口有一个最大的串行速率，每一条VC都有速率，所以同一接口的下的VC之和不能超过物理接口的最大速率 当缓冲区满的时候，就发生了拥塞 * CIR是个平均速度 我国允许单独购买EIR 当发生拥塞时把DE=1 的贞丢掉 * * * 贞中继典型的连接都是星型 * CLLM ---Consolidated Link Layer Management (CLLM) * Inverse ARP的操作过程参考教材3.1.5.4的flash * * * * * 实验要求参考教材3.2.2.2的pdf文档，操作参考教材3.2.2.2的PT操作 如果不写broadcast，信息不会广播出去，只能单播 * 实验要求参考教材3.2.2.2的pdf文档，操作参考教材3.2.2.2的PT操作 * Purpose: This figure is a transition discussion to illustrate the need for subinterfaces. Now that students are familiar with the