配置MST的根交换机
配置过程：1） 进入全局模式configure terminal
2） 配置MST根交换机
spanning-tree mst 实例号 root primary
案例：
switch(config)#spanning-tree mst 1 root primary
Switch#show span mst 1###### MST01 vlans mapped: 20-30
Bridge address 000d.6564.0280priority24577 (24576 sysid 1)
Root this switch for MST01Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- -------------------------------
Fa0/23 Boun FWD 200000 128.23 P2p Bound(PVST)
Fa0/24 Boun FWD 200000 128.24 P2p Bound(PVST)交换机优先级
配置过程：
1） 进入全局模式configure terminal
2） 修改交换机的优先级
spanning-tree mst 1 priority 优先级
优先级：取值为0-61440，优先级为4096的倍数
案例：
Switch(config)#spanning-tree mst 1 priority 36864
Switch#show spanning-tree mst 1###### MST01 vlans mapped: 20-30
Bridge address 000d.6564.0280priority36865 (36864 sysid 1)
Root this switch for MST01Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- -------------------------------
Fa0/23 Boun FWD 200000 128.23 P2p Bound(PVST)
Fa0/24 Boun FWD 200000 128.24 P2p Bound(PVST)
配置MST的开销
1） 进入全局模式configure terminal
2） 进入接口模式interface 接口
3） 配置端口的MST开销
spanning-tree mst 实例号 cost 成本
案例：
sw2(config)#show span mst 1
###### MST01 vlans mapped: 20-30
Bridge address 000b.5f2c.2080priority32769 (32768 sysid 1)
Root this switch for MST01Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- -------------------------------
Fa0/23 Desg FWD 200000 128.23 P2p
Fa0/24 Desg FWD 200000 128.24 P2pSw2(config)#interface f0/23
sw2(config-if)#span mst 1 cost 20000
sw2(config-if)#do show span mst 1###### MST01 vlans mapped: 20-30
Bridge address 000b.5f2c.2080priority32769 (32768 sysid 1)
Root this switch for MST01Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- -------------------------------
Fa0/23 Desg FWD 200000 128.23 P2p
Fa0/24 Desg FWD 20000 128.24 P2p
端口优先级
配置过程：
1） 进入全局模式configure terminal
2） 进入接口模式interface 接口
3） 配置端口的优先级
spanning-tree mst 实例号 port-priority 优先级
优先级默认为128
案例：
sw2(config)#interface f0/24
sw2(config-if)#spann mst 1 port-priority 64
sw2(config-if)#end
sw2#show spanning mst 1###### MST01 vlans mapped: 20-30
Bridge address 000b.5f2c.2080priority32769 (32768 sysid 1)
Root this switch for MST01Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- -------------------------------
Fa0/23 Desg FWD 200000 128.23 P2p
Fa0/24 Desg FWD 20000 64.24 P2p修改时间器
sw2(config)#spann mst hello-time ?
<1-10>number of seconds between generation of config BPDUssw2(config)#span mst forward-time ?
<4-30>number of seconds for the forward delay timersw2(config)#span mst max-age ?
<6-40>maximum number of seconds the information in a BPDU is validsw2#show span mst###### MST00 vlans mapped: 1-19,31-4094
Bridge address 000b.5f2c.2080priority32768 (32768 sysid 0)
Root this switch for CST and IST
Configuredhello time 1, forward delay 15, max age 20, max hops 20Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- -------------------------------
Fa0/23 Desg FWD 200000 128.23 P2p
Fa0/24 Desg FWD 200000 128.24 P2p案例：
CCIE-LAB(V160)
题目要求：
在SW1、SW2、SW3上配置MST，要求偶数VLAN加入实例1，奇数VLAN加入实例2
配置：
SW1
config terminal
spanning-tree mode mst
spanning-tree mst configuration
instance 1 vlan 20,40,60
instance 2 vlan 30,50,70
name cisco
revision 1
sw2
config terminal
spanning-tree mode mst
spanning-tree mst configuration
instance 1 vlan 20,40,60
instance 2 vlan 30,50,70
name cisco
revision 1
SW3
config terminal
spanning-tree mode mst
spanning-tree mst configuration
instance 1 vlan 20,40,60
instance 2 vlan 30,50,70
name cisco
revision 1
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