在分布层交换机上的迁移配置与汇聚层交换机上的迁移配置一样，也是把生成树模式迁移到Rapid-PVST+模式，然后禁止Rapid_PVST+不支持的BackboneFast特性即可。具体如下（在迁移过程中交换机上的三层VLAN接口将先关闭，然后打开，以实现收敛）：
Distribution 1(config)#spanning-tree mode rapid-pvst
2d02h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan10, changed state to
up
2d02h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan20, changed state to
up
2d02h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan30, changed state to
up
2d02h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan40, changed state to
up
2d02h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan100, changed state to
up
2d02h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan200, changed state to
up
2d02h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan40, changed state to
down
2d02h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan30, changed state to
down
2d02h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan40, changed state to
up
2d02h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan30, changed state to
up
Distribution 1(config)#no spanning-tree backbonefast
Distribution 2(config)#spanning-tree mode rapid-pvst
2d02h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to
own
2d02h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to
p
2d02h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan10, changed state to
up
2d02h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan20, changed state to
up
2d02h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan30, changed state to
up
2d02h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan40, changed state to
up
2d02h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan100, changed state t
up
2d02h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan200, changed state t
up
2d02h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan30, changed state to
down
2d02h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan30, changed state to
up
Distribution 2(config)#no spanning-tree backbonefast