生成树协议 ning Tree Protocol mm Cisco.com 深圳职业技术学院计算机系网络专业 2006，Shenz All rights
© 2006, Shenzhen Polytechnic. All rights reserved. 1 生成树协议 Spanning Tree Protocol 深圳职业技术学院计算机系网络专业
教学目标(Objectives) 亚 Cisco.com ·1.IP地址概念（Concept of IP Address) ·2.IP地址分类(Class of IP Address) ·3.保留和私有地址(Reserved and Private IP Address) ·4.网络掩码和子网划分(Network Mask and Subnetting 5.可变长度子网掩码(VLSM) ·6.汇总和ClDR(Summarization and CIDR) 2006,Shew zhen Polytechnic.Allrights reserved
© 2006, Shew zhen Polytechnic. All rights reserved. 2 教学目标（ Objectives ） • 1. IP地址概念（ Concept of IP Address ） • 2. IP地址分类 （Class of IP Address） • 3. 保留和私有地址（ Reserved and Private IP Address） • 4. 网络掩码和子网划分（Network Mask and Subnetting ） 5. 可变长度子网掩码（ VLSM ） • 6. 汇总和CIDR（ Summarization and CIDR）
Objectives Cisco.com Redundant topologies Spanning Tree Protocol 2006 Shew zhen Polvtechnic Allriahts reserved
© 2006, Shew zhen Polytechnic. All rights reserved. 3 Objectives • Redundant topologies • Spanning Tree Protocol
冗余(Redundancy) 厦 Cisco.com 冗余网络拓扑确保网络持续工作，避免单点故障 Redundant networking topologies are designed to ensure that networks continue to function in the presence of single points of failure. CRASH CRASH专 1AN There is one car,can I drive to work? There are two cars,can I drive to work? All rights reserved
© 2006, Shew zhen Polytechnic. All rights reserved. 4 冗余（Redundancy） 冗余网络拓扑确保网络持续工作，避免单点故障 Redundant networking topologies are designed to ensure that networks continue to function in the presence of single points of failure
冗余拓扑(Redundant Topologies) m Cisco.com 面
© 2006, Shew zhen Polytechnic. All rights reserved. 5 冗余拓扑（Redundant Topologies）
冗余拓扑(Redundant Topologies) 瘦 Cisco.com ·1.冗余拓扑的目标是为了避免网络出现单点故障 A goal of redundant topologies is to eliminate network outages caused by a single point of failure. ·2所有的网络需要冗余来提高可靠性 All networks need redundancy for enhanced reliability. 2006 Shew zhen Polvtechnic.Allrights reserved
© 2006, Shew zhen Polytechnic. All rights reserved. 6 冗余拓扑（Redundant Topologies） • 1.冗余拓扑的目标是为了避免网络出现单点故障 • A goal of redundant topologies is to eliminate network outages caused by a single point of failure. • 2.所有的网络需要冗余来提高可靠性 • All networks need redundancy for enhanced reliability
简单的冗余交换拓扑 (Simple Redundant Switched Topology) WIIW Cisco.com Server/Host X Router Y Segment 1 Switch B Segment 2 006.Shew zhen Polytechnic.Allrights reserve
© 2006, Shew zhen Polytechnic. All rights reserved. 7 简单的冗余交换拓扑 （Simple Redundant Switched Topology）
简单的冗余交换拓扑 (Simple Redundant Switched Topology) wwwww Cisco.com ·1冗余拓扑消除了单点故障 Redundant topologies eliminate single points of failure. ·2.交换机对不知道地址的帧进行泛洪 Switches will flood frames for unknown destinations. ·3交换机对广播和组播也进行泛洪。 Broadcasts and multicasts are also flooded. 4.冗余交换拓扑或许会带来广播风暴、多帧拷贝以及MAC地址表不 稳定的问题 A redundant switched topology may cause broadcast storms, multiple frame copies,and MAC address table instability problems. 2006,Shew zhen Polytechnic.Allrights reserved
© 2006, Shew zhen Polytechnic. All rights reserved. 8 简单的冗余交换拓扑 （Simple Redundant Switched Topology） • 1.冗余拓扑消除了单点故障 • Redundant topologies eliminate single points of failure. • 2. 交换机对不知道地址的帧进行泛洪 • Switches will flood frames for unknown destinations. • 3.交换机对广播和组播也进行泛洪。 • Broadcasts and multicasts are also flooded. • 4.冗余交换拓扑或许会带来广播风暴、多帧拷贝以及MAC地址表不 稳定的问题 • A redundant switched topology may cause broadcast storms, multiple frame copies, and MAC address table instability problems
广播风暴(Broadcast Storm) d厦 Cisco.com
© 2006, Shew zhen Polytechnic. All rights reserved. 9 广播风暴（Broadcast Storm）
多帧传输(Multiple Frame Transmissions) AWIE Cisco.com Server/Host X Unicast Router Y Segment 1 Unicast Unicast Switch A Switch B Segment 2 在冗余交换网络中，对终端设备来讲，收到多帧相同数据是可能的。 In a redundant switched network it is possible for an end device to receive multiple frames
© 2006, Shew zhen Polytechnic. All rights reserved. 10 多帧传输（Multiple Frame Transmissions） 在冗余交换网络中，对终端设备来讲，收到多帧相同数据是可能的。 In a redundant switched network it is possible for an end device to receive multiple frames