1.
按照下图的实验环境:
1)
在sw1上和sw2上起trunk:
Switch(config)#h sw2
sw2(config)#int f0/1
sw2(config-if)#switchport mode tr
sw2(config-if)#do sh int tr
Port Mode Encapsulation Status Native vlan
Fa0/1 on 802.1q trunking 1
2)
sw1上设置vtp域名,sw2可以学习到:
sw1(config)#vtp domain cisco
sw1(config)#vtp mode server
sw2(config)#vtp mode client
sw1(config)#do sh vtp status
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 255
Number of existing VLANs : 5
VTP Operating Mode : Server
VTP Domain Name : cisco sw1上设置后域名变为cisco
sw2(config)#do sh vtp sta
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 255
Number of existing VLANs : 5
VTP Operating Mode : Client
VTP Domain Name : cisco sw2上学习到sw1上的cisco
3)
sw1上创建vlan2,在sw2上可以学习到:
sw1(config)#vlan 2
sw1(config-vlan)#do sh vlan
2 VLAN0002 active sw1上vlan有2个
sw1(config-vlan)#do sh vtp sta
VTP Version : 2
Configuration Revision : 1 修订编号为1
Maximum VLANs supported locally : 255
Number of existing VLANs : 6
VTP Operating Mode : Server
VTP Domain Name : cisco
sw2(config)#do sh vlan
2 VLAN0002 active sw2上学到了新的vlan
sw2(config)#do sh vtp sta
VTP Version : 2
Configuration Revision : 1 修订编号也同步server变为1
Maximum VLANs supported locally : 255
Number of existing VLANs : 6
VTP Operating Mode : Client
VTP Domain Name : cisco
4)
断开trunk,sw2上改变模式,创建vlan3,sw1可以学习到:
sw2(config)#int f0/1
sw2(config-if)#shutdown
sw2(config)#vtp mode server
Setting device to VTP SERVER mode.
sw2(config)#vlan 3
sw2(config)#vtp mode client
Setting device to VTP CLIENT mode.
sw2(config)#int f0/1
sw2(config-if)#no sh
sw1上和sw2上的vlan信息和vtp状态是相同的:
sw1(config-vlan)#do sh vtp sta
Configuration Revision : 2 修订编号变为2
Number of existing VLANs : 7 vlan加1
VTP Operating Mode : Server
VTP Domain Name : cisco
5)
断开trunk,sw1创建vlan4,sw2创建vlan5,连接trunk,结果发现互相不会学习,因为修订编号没有改变。
sw1(config)#int f0/1
sw1(config-if)#shutdown
sw1(config)#vlan 4
sw1(config-vlan)#do sh vlan
1 default active
2 VLAN0002 active
3 VLAN0003 active
4 VLAN0004 active
sw1(config-vlan)#do sh vtp sta
Configuration Revision : 3
Number of existing VLANs : 8
VTP Operating Mode : Server
VTP Domain Name : cisco
sw2(config)#vtp mode server
sw2(config)#vlan 5
sw2(config)#vtp mode client
sw2(config)#do sh vlan
1 default active
2 VLAN0002 active
3 VLAN0003 active
5 VLAN0005 active
sw2(config)#do sh vtp sta
Configuration Revision : 3
Number of existing VLANs : 8
VTP Operating Mode : Client
VTP Domain Name : cisco
sw1(config-vlan)#int f0/1
sw1(config-if)#no sh
连接后发现再show vlan和show vtp status结果跟刚才一样,并没有改变。
6)
Sw1上创建vlan6,sw2上同步了,vlan5不存在了,完全同步了。
sw1(config)#vlan 6
sw1#sh vlan
1 default active
2 VLAN0002 active
3 VLAN0003 active
4 VLAN0004 active
6 VLAN0006 active
sw1#sh vtp sta
Configuration Revision : 4
Number of existing VLANs : 9
VTP Operating Mode : Server
VTP Domain Name : cisco
sw2#sh vlan
1 default active
2 VLAN0002 active
3 VLAN0003 active
4 VLAN0004 active
6 VLAN0006 active
sw2#sh vtp sta
Configuration Revision : 4
Number of existing VLANs : 9
VTP Operating Mode : Client
VTP Domain Name : cisco
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