由于设备限制,本实验只在一台3550交换机上完成。主要目的是熟悉配置命令。
conf t
vlan 2
vlan 3
vlan 4
vlan 5
vlan 6
vlan 7
vlan 8
exit
spanning-tree mst config 进入spanning-tree-mst配置
name ccie 命名为CCIE
instance 1 vlan 2-4
instance 2 vlan 5-8 这两个命令是定义两个实例,并将所配置的VLAN分配到实例中去。
revision 1 设置revision值,在所有运行name相同的MST的revision值必须相同。version取值范围是 0~65535
exit
spanning-tree mode mst 在交换机上启用MST
spanning-tree mst 1 root primary 设置此交换机为MST实例1的根交换机
spanning-tree mst 2 root secordary 设置此交换机为MST实例2的次根交换机
int f 0/19
spanning-tree mst 1 port-priority 32 设置此端口在MST实例1中的端口优先级,取值越低,优先级越高。优先级范围0~240,默认为128,在此设为32。注意,优先级是以16的倍数增长的,比如设置成为2,则交换机会报错
spanning-tree mst 1 cost 100 设置此端口在MST实例1中的cost值,范围1~200000000
exit
spanning-tree mst 1 priority 4096 设置此交换机在MST实例1中的优先级。取值越低,越有可能成为根交换机。优先级范围0~61440,默认为52768。注意,优先级必须是以4096的倍数向上增加。否则交换机会报错
spanning-tree hello-time 10 范围1~10,默认为2,单位second
spanning-tree forward-time 20 范围4~30,默认为15
spanning-tree max-age 30 范围6~40 ,默认为20
spanning-tree mst max-hop 10 配置BPDU在被丢弃前MST区域中所传输的跳数。范围1~255(在我所实验的3550上范围是1~20,可能是IOS版本的问题)
以下是校验
sw2#sh sp mst config
Name [ccie]
Revision 2
Instance Vlans mapped
-------- ---------------------------------------------------------------------
0 1,9-4094
1 2-4
2 5-8
-------------------------------------------------------------------------------
Name [ccie]
Revision 2
Instance Vlans mapped
-------- ---------------------------------------------------------------------
0 1,9-4094
1 2-4
2 5-8
-------------------------------------------------------------------------------
sw2#sh sp mst 1
###### MST01 vlans mapped: 2-4
Bridge address 000a.4153.0f00 priority 24577 (24576 sysid 1)
Root this switch for MST01
Bridge address 000a.4153.0f00 priority 24577 (24576 sysid 1)
Root this switch for MST01
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Fa0/19 Boun FWD 200000 128.19 P2p Bound(STP)
Fa0/20 Boun FWD 200000 128.20 P2p Bound(STP)
Fa0/21 Boun FWD 200000 128.21 P2p Bound(STP)
Fa0/22 Boun FWD 200000 128.22 P2p Bound(STP)
Fa0/23 Boun FWD 200000 128.23 P2p Bound(RSTP)
Fa0/24 Desg FWD 200000 128.24 P2p
---------------- ---- --- --------- -------- --------------------------------
Fa0/19 Boun FWD 200000 128.19 P2p Bound(STP)
Fa0/20 Boun FWD 200000 128.20 P2p Bound(STP)
Fa0/21 Boun FWD 200000 128.21 P2p Bound(STP)
Fa0/22 Boun FWD 200000 128.22 P2p Bound(STP)
Fa0/23 Boun FWD 200000 128.23 P2p Bound(RSTP)
Fa0/24 Desg FWD 200000 128.24 P2p
sw2#sh sp mst 2
###### MST02 vlans mapped: 5-8
Bridge address 000a.4153.0f00 priority 4098 (4096 sysid 2)
Root this switch for MST02
Bridge address 000a.4153.0f00 priority 4098 (4096 sysid 2)
Root this switch for MST02
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Fa0/19 Boun FWD 200000 128.19 P2p Bound(STP)
Fa0/20 Boun FWD 200000 128.20 P2p Bound(STP)
Fa0/21 Boun FWD 200000 128.21 P2p Bound(STP)
Fa0/22 Boun FWD 200000 128.22 P2p Bound(STP)
Fa0/23 Boun FWD 200000 128.23 P2p Bound(RSTP)
Fa0/24 Desg FWD 200000 128.24 P2p
---------------- ---- --- --------- -------- --------------------------------
Fa0/19 Boun FWD 200000 128.19 P2p Bound(STP)
Fa0/20 Boun FWD 200000 128.20 P2p Bound(STP)
Fa0/21 Boun FWD 200000 128.21 P2p Bound(STP)
Fa0/22 Boun FWD 200000 128.22 P2p Bound(STP)
Fa0/23 Boun FWD 200000 128.23 P2p Bound(RSTP)
Fa0/24 Desg FWD 200000 128.24 P2p
sw2#sh sp mst interface f0/19
FastEthernet0/19 of MST00 is designated forwarding
Edge port: no (default) port guard : none (default)
Link type: point-to-point (auto) bpdu filter: disable (default)
Boundary : boundary (STP) bpdu guard : disable (default)
Bpdus sent 143, received 7
Edge port: no (default) port guard : none (default)
Link type: point-to-point (auto) bpdu filter: disable (default)
Boundary : boundary (STP) bpdu guard : disable (default)
Bpdus sent 143, received 7
Instance Role Sts Cost Prio.Nbr Vlans mapped
-------- ---- --- --------- -------- -------------------------------
0 Desg FWD 200000 128.19 1,9-4094
1 Boun FWD 200000 128.19 2-4
2 Boun FWD 200000 128.19 5-8
-------- ---- --- --------- -------- -------------------------------
0 Desg FWD 200000 128.19 1,9-4094
1 Boun FWD 200000 128.19 2-4
2 Boun FWD 200000 128.19 5-8