MSTP生成树

拓扑图

配置

根桥选举

• 比较桥ID（优先级+MAC地址），优先级默认32768，值越小越优先，优先级相同，MAC地址小的优先

端口角色确定

• 根桥的接口为指定端口
• 非根桥的端口比较顺序

1. 根路径开销RPC
2. 发送者桥ID
3. 发送者PID
4. 自己的PID

sysname SW1
#
vlan batch 10 20 30 40
#
stp instance 1 priority 8192
stp instance 2 root secondary
#
stp region-configuration
 region-name MST
 revision-level 123
 instance 1 vlan 10 30
 instance 2 vlan 20 40
 active region-configuration
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 2 to 4094
#
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 2 to 4094
#

sysname SW2
#
vlan batch 10 20 30 40
#
stp instance 1 priority 16384
stp instance 2 root primary
#
stp region-configuration
 region-name MST
 revision-level 123
 instance 1 vlan 10 30
 instance 2 vlan 20 40
 active region-configuration
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 2 to 4094
#
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 2 to 4094

sysname SW3
#
vlan batch 10 20 30 40
#
stp region-configuration
 region-name MST
 revision-level 123
 instance 1 vlan 10 30
 instance 2 vlan 20 40
 active region-configuration
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 2 to 4094
#
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 2 to 4094

查看实例1、2阻塞端口

查看实例的根桥

查看映射关系