9、第九课：VLAN概念及实现.pptVIP

VLAN概念及实现 本章目标 通过本章的学习，您应该掌握以下内容: 配置一个VLAN 配置VTP (VLAN Trunking Protocol)协议 配置交换机的主干连接功能 确认VLAN的连接性 确认生成树(spanning-tree)是否运行 VLAN综述 VLAN运作 VLAN运作 VLAN运作 VLAN的成员模式 ISL标识 通过硬件(ASIC)实现 ISL标识不会出现在工作站，客户端并不知道ISL的封装信息 在交换机或路由器与交换机之间，在交换机与具有ISL网卡的服务器之间可以实现 ISL封装 用ISL头与CRC进行帧封装 可以支持多个VLAN (1024) VLAN号 BPDU控制位 ISL and 802.1Q 比较 VTP协议(VLAN Trunking Protocol ) 一个能够宣告VLAN配置信息的信息系统 通过一个共有的管理域，维持VLAN配置信息的一致性 VTP只能在主干端口发送要宣告的信息 支持混合的介质主干连接(快速以太网, FDDI, ATM) VTP模式 VTP是如何工作的 VTP是如何工作的 VTP裁减 VLAN配置的原则 VLAN配置的步骤 VTP 配置的内容 VTP域名 VTP模式 (服务器/客户/透明)—VTP服务器模式是缺省值 VTP裁减 VTP密码 VTP捕取 创建VTP域 确认VTP配置 设置中继功能 确认中继功能 创建一个VLAN 确认一个VLAN 分配交换机的端口到VLAN（静态） 查看VLAN中的成员 确认生成树 复习 Slide 1 of 1 Purpose: Emphasize: Slide 1 of 1 Purpose: Emphasize: Note: Once a port has been assigned to a VLAN, it can not send or receive traffic from devices in another VLAN without the intervention of a layer 3 device like a router. The 1900 can’t be configure as the VMPS. A CiscoWorks 2000 or CWSI management station or a Cat 5000 switch can be configured as the VMPS. In the future, dynamic VLANs may also offer membership based on other criteria such as protocol or application. Dynamic VLANs are covered in the Managing Cisco Switched Internetworks class. Slide 1 of 1 Purpose: Emphasize: Note: The 1900 only supports ISL trunking. ISL is Cisco Proprietary. 802.1Q is an IEEE standard. Other trunk types: LANE (VLANSs over ATM) 802.10 (FDDI trunk) Slide 1 of 1 Purpose: Emphasize: Note: Since ISL technology is implemented in ASICs, frames are tagged at wire speed. The number of VLANs supported by a switch depends on the switch hardware. The Catalyst 1900en supports 64 active VLANs with an instance of STP per VLAN. PVST = Per VLAN Spanning Tree. PVST is a Cisco proprietary implementation. It requires Cisco ISL encapsulation in order to work. Slide 1 of 1 Purpose: Emphasize: Notes: VTP is a Cisco proprietray feature. VTP is a Layer 2 messaging protocol that maintains VLAN configuration consistency b