RSTP (802.1W)
根端口:非根网桥去选举
1、COST 100M 19 10M 100
2、send B-ID
3、SEND PORT-ID(端口的优先级+接口ID)
spanning-tree vlan 1 port-priority 128
选举指定接口
根桥上的接口都是指定接口（基于链路)
比较该接口到达根桥的COST
比较B-ID
Rapid Spanning Tree Protocol(862.1w)
RSTP
802.1W相对于先前的802.1D生成树来说,在网络拓扑发生变化的时候提供更快的收敛速度，
RSTP中还集成了类似于uplink和backbonefast属性.
RSTP它把Broking接口变为（替代接口和备份接口）
RSTP Port States
RSTP 端口状态
在STP种与设备连接的接口是Port Fast，在RSTP中也有一类类似的Edge Ports接口
配置命令spanning-tree portfast
Functions similarly to PortFast（思科).
Configured by issuing the spanning-tree portfast command（思科)
When a edge port receives a BPDu,it generates a TCN.
switchport mode access模式下
*Full-duplex---point-to-point
*Half-duplex---shared
*通过接口命令修改其默认的链路类型spanning-tree link-type ?
Switch(config-if)#spanning-tree link-type ?
point-to-point Consider the interface as point-to-point
shared Consider the interface as shared
Switch(config-if)#spanning-tree link-type
PVRST Implementation Commands
-Configuring
spanning-tree mode rapid-pvst #全局模式下
-Verifying #查验
show spanning-tree vlan 10
-Debugging
debug spanning-tree
Switch#show spanning-tree vlan 10
VLAN0010
Spanning tree enabled protocol rstp
Root ID Priority 32778
Address 5064.1700.ba00
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32778 (priority 32768 sys-id-ext 10)
Address 5064.1700.ba00
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi0/1 Desg BLK 4 128.2 P2p
Switch#
STP ----所有VAN 1棵生成树，.理论知识，不存在
RSTP ----所有TLAN1棵生成树+快速收敛
PVST ----每个LAN1棵生成树
rapid-pvst---每个江A的1棵生成树+快速收敛
MSTP结合了STP+PVST+RSTP的优点
多个VLAN 1棵生成树
100个VLAN
1-50实例1 每个实例就是一个生成树
51-100实例2
快速收敛
CCNP
MSTP一定要 instance 0 要设置成根桥
