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1、MSTP网络技术原理介绍技术创新,变革未来STP/RSTP都是单生成树协议生成树协议如何实现负载分担?引入了解MSTP和RSTP/STP的不同之处掌握MSTP的基本概念掌握MSTP的工作原理掌握MSTP的配置课程目标学习完本课程,您应该能够:MSTP引入MSTP基本概念MSTP工作原理MSTP配置目录STP/RSTP的局限所有VLAN共享一颗生成树无法实现不同VLAN在多条Trunk链路上的负载分担VLAN1VLAN100均阻塞此链路VLAN51VLAN100链路中断,无法通信VLAN1VLAN50VLAN51VLAN100VLAN1VLAN100SWBBID=8192.MAC BSWABID

2、=0.MAC ASWCBID=32768.MAC CSWABID=0.MAC ASWBBID=8192.MAC BSWCBID=32768.MAC CMSTPMSTP(Multiple Spanning Tree,多生成树协议)基于实例计算出多颗生成树,实例间实现负载分担实例1:VLAN1VLAN50阻塞实例2: VLAN51VLAN100转发SWABID=0.MAC ASWBBID=8192.MAC BSWCBID=32768.MAC C实例2: VLAN51VLAN100阻塞实例1:VLAN1VLAN50转发实例1阻塞实例2阻塞MSTP引入MSTP基本概念MSTP工作原理MSTP配置目录M

3、ST域MST域(MST Region):拥有相同MST配置标识的网桥构成的集合域名修订级别VLAN映射关系Region 1:VLAN mapping:VLAN 2 to Instance 2VLAN 4 to Instance 4Region 2:VLAN mapping:VLAN 4 to Instance 4VLAN 5 to Instance 5Region 1Region 2STP/RSTP交换机Region 3CST、IST、CIST、总根和域根Region 1Region 4CSTRegion 3:VLAN mapping:VLAN 3 to Instance 3VLAN 5 to

4、 Instance 5Other VLANs to ISTRegion 1:VLAN mapping:VLAN 2 to Instance 2VLAN 4 to Instance 4Other VLANs to ISTRegion 2:VLAN mapping:VLAN 2 to Instance 2VLAN 3 to Instance 3Other VLANs to ISTISTRegion 4:VLAN mapping:VLAN 4 to Instance 4VLAN 5 to Instance 5Other VLANs to ISTRegion 2CISTCIST总根CIST域根MSTI

5、和MSTI域根MSTI 5的拓扑MSTI 3 Region RootMSTI 3的拓扑MSTI 5 Region RootRegion 3 VLAN 映射关系:VLAN 3 映射到Instance 3VLAN 5 映射到Instance 5其他VLAN映射到 ISTRegion 3CIST Region RootSWASWBSWCSWDMSTP中的端口角色Master端口IST根桥在CIST上的根端口其他端口角色的定义和RSTP相同域边界端口/Master端口域边界端口Region 3RPDPDPDPRPAPAPDPRPAPDPDPDPSWASWBSWCSWDMSTP引入MSTP基本概念MST

6、P工作原理MSTP配置目录MSTI优先级向量MSTP的BPDU格式CIST Root IDCIST EPCCIST Region Root IDCIST Port IDParameterOctetProtocol ID2Protocol Version IDBPDU TypeCIST FlagsMessage Age11184822Max AgeHello TimeForward Delay222Version1 Length=01CIST Remaining HopsMSTI Configuration MessagesParameterOctetVersion3 Length2MST Co

7、nfiguration IDCIST IRPCCIST Bridge ID51481LENMSTI Port PriorityMSTI Remaining HopsParameterOctetMSTI Flag1MSTI Region Root IDMSTI IRPCMSTI Bridge Priority84111RST BPDU字段MST专有字段MSTI配置信息Format SelectorNameRevision LevelConfig DigestMST配置标识CIST的优先级向量CIST优先级向量=RootID: ERPC: RRootID:IRPC: DesignateBridge

8、ID: DesignatePortID: RcvPortID比较原则:最小最优首先比较CIST总根ID其次比较CIST外部路径开销再次比较CIST域根ID再其次比较CIST内部路径开销再其次比较CIST指定桥ID再其次比较CIST指定端口ID最后比较CIST接收端口IDMSTI 的优先级向量MSTI优先级向量=RRootID: IRPC: DesignateBridgeID: DesignatePortID: RcvPortID比较原则:最小最优首先比较MSTI域根ID其次比较MSTI内部路径开销再其次比较MSTI指定桥ID再其次比较MSTI指定端口ID最后比较MSTI接收端口IDMSTP 计

9、算方法CST/IST的计算和RSTP类似MSTI的计算仅限于区域内MSTI计算参数包含在IST BPDU中,和IST的计算同步完成Region 4MSTI 4配置信息MSTI 5配置信息CIST 配置信息IST BPDUSWASWBSWCE1/0/1E1/0/1CST计算Region 3Region 1Region 4Region 2DPDPRP/MPRP/MPDPAPDPRP/MPSWASWBSWCSWDIST计算Region 3Region 1Region 4Region 2DPDPRP/MPRP/MPDPAPDPRP/MPSWASWBSWCSWDMSTI计算过程-Region1CIST

10、RootMSTI 2 Region RootMSTI 2 的拓扑MSTI 4 Region RootRegion 1 VLAN 映射关系:VLAN 2 映射到Instance 2VLAN 4 映射到Instance 4其他VLAN映射到 ISTMSTI 4 的拓扑SWASWA2SWA3MSTI计算过程-Region2MSTI 3的拓扑MSTI 2 Region RootMSTI 2的拓扑MSTI 3 Region RootRegion 2 VLAN 映射关系:VLAN 2 映射到Instance 2VLAN 3 映射到Instance 3其他VLAN映射到 ISTCIST Region Roo

11、tSWBSWB2SWB3SWB4MSTP计算结果Region 3Region 1Region 4Region 3:VLAN mapping:VLAN 3 to Instance 3VLAN 5 to Instance 5VLAN others to ISTRegion 1:VLAN mapping:VLAN 2 to Instance 2VLAN 4 to Instance 4Other VLANs to ISTRegion 2:VLAN mapping:VLAN 2 to Instance 2VLAN 3 to Instance 3Other VLANs to ISTRegion 4:VLA

12、N mapping:VLAN 4 to Instance 4VLAN 5 to Instance 5VLAN others to ISTRegion 2CIST总根MSTP计算结果及分析Region 3Region 1Region 4Region 3:VLAN mapping:VLAN 3 to Instance 3VLAN 5 to Instance 5VLAN others to ISTRegion 1:VLAN mapping:VLAN 2 to Instance 2VLAN 4 to Instance 4VLAN others to ISTRegion 2:VLAN mapping:V

13、LAN 2 to Instance 2VLAN 3 to Instance 3VLAN others to ISTRegion 4:VLAN mapping:VLAN 4 to Instance 4VLAN 5 to Instance 5VLAN others to ISTRegion 2CIST总根VLAN2VLAN2Host AHost BMSTP计算结果及分析(续)Region 3Region 1Region 4Region 3:VLAN mapping:VLAN 3 to Instance 3VLAN 5 to Instance 5VLAN others to ISTRegion 1:

14、VLAN mapping:VLAN 2 to Instance 2VLAN 4 to Instance 4VLAN others to ISTRegion 2:VLAN mapping:VLAN 2 to Instance 2VLAN 3 to Instance 3VLAN others to ISTRegion 4:VLAN mapping:VLAN 4 to Instance 4VLAN 5 to Instance 5VLAN others to ISTRegion 2CIST总根VLAN3VLAN3Host AHost BMSTP和RSTP的互操作MSTP RegionRSTP桥RSTP

15、桥将MSTP域看做一个桥ID为域根ID的RSTP桥域根SWABID=0.MAC ASWBBID=4096.MAC BBPDUMSTP的P/A机制上游桥发送的Proposal BPDU中,P标志位和A标志位都置位下游收到P标志位和A标志位都置位的Proposal BPDU,在将端口同步后会回应Agreement BPDU,使得上游的指定端口快速进入转发状态SWASWBProposal(P=1;A=1)Agreement(A=1)MSTP引入MSTP基本概念MSTP工作原理MSTP配置目录MSTP基本配置区域配置由系统视图进入区域配置视图配置域名配置修订级别H3C stp region-confi

16、guration H3C-mst-region region-name nameH3C-mst-region revision-level levelMSTP基本配置(续)区域配置配置VLAN和实例的映射激活区域配置H3C-mst-region instance instance-id vlan vlan-listH3C-mst-region active region-configurationMSTP高级配置配置交换机为首选根桥配置交换机为备份根桥H3C stp instance instance-id root primaryH3C stp instance instance-id ro

17、ot secondaryMSTP兼容性配置配置端口识别/发送MSTP报文格式H3C-GigabitEthernet1/0/1 stp compliance auto | dot1s | legacy MSTP兼容性配置(续)全局开启摘要侦听端口开启摘要侦听H3C stp config-digest-snoopingH3C-Ethernet1/0/1 stp config-digest-snoopingMSTP兼容性配置RST MST Proposal(P=1)下游设备配置No Agreement Check 特性SWB-Ethernet1/0/1 stp no-agreement-check SWABID=0.MAC ASWBBID=32768.MAC BE1/0/1MSTP配置案例在SWA配置SWA stp region-configurationSWA-mst-region region-name H3CSWA-mst-region revision-level 0SWA-mst-region instance 1 vlan 2S

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