MSTP 802.1s

여러 개의 스패닝트리를 그룹화해 1개의 스패닝트리 처럼 동작하게 하여 프로세서의 소모율을 줄인다.

셋팅

Dispatch_L2_1

spanning-tree mode mst

no spanning-tree optimize bpdu transmission

spanning-tree extend system-id

spanning-tree vlan 1,10,20,30,40 priority 40960

!

spanning-tree mst configuration

 name mst-1

 instance 1 vlan 1, 10, 20, 30, 40

!

spanning-tree mst 1 priority 40960

!

!

!

!

interface FastEthernet0/1

 switchport mode trunk

!

interface FastEthernet0/2

 switchport mode trunk

!

결과

Dispatch_L2_1#show spanning-tree mst configuration

Name      [mst-1]

Revision  0

Instance  Vlans mapped

--------  -------------------------------------------------------------------

0         2-9,11-19,21-29,31-39,41-4094

1         1,10,20,30,40

----------------------------------------------------------------------------

Dispatch_L2_1#show spanning-tree mst 1

Interface        Role Sts Cost      Prio.Nbr Type

---------------- ---- --- --------- -------- --------------------------------

Fa0/1            Altn BLK 200000     128.1    P2p

Fa0/2            Root FWD 200000   128.2    P2p

Dispatch_L2_2#show spanning-tree mst 1

Interface        Role Sts Cost      Prio.Nbr Type

---------------- ---- --- --------- -------- --------------------------------

Fa0/1            Desg FWD 200000    128.1    P2p

Fa0/3            Root FWD 200000    128.3    P2p

Dispatch_L3_1#show spanning-tree mst 1

Interface        Role Sts Cost      Prio.Nbr Type

---------------- ---- --- --------- -------- --------------------------------

Fa0/2            Desg FWD 200000    128.2    P2p Pre-STD-Rx

Fa0/3            Desg FWD 200000    128.3    P2p Pre-STD-Rx