1. 以太網(wǎng)
1. 接口MTU和ip MTU
Switch(config-if)#mtu 1500
Switch(config-if)#ip mtu 1500
Switch#sh int s1/0
Switch#sh ip int s1/0
2. 管理MAC表
48位，點分十六進制表示
Switch#show mac address-table
Switch#clear mac address-table
Switch(config)#mac address-table static aaaa.bbbb.cccc vlan 10 interface e0/0
2. 二層交換
1. Protected port
Switch(config-if)#switchport protected
2. Native Vlan
Switch(config-if)#switchport trunk native vlan 10
Switch(config)#vlan dot1q tag native
配置對native vlan也打標簽
Vlan范圍：（dot1q）
3. Trunk配置
ISL:支持1-1005個vlan編號
DOT1Q:支持1-4094個vlan編號
Switch(config-if)#switchport mode access
將接口設置為access模式
Switch(config-if)#switchport trunk encapsulation {dot1q | ISL | negotiate }
Switch(config-if)#switchport mode {auto | desirable |trunk}
Switch#show interface f0/8 switchport
將接口設置為DTP動態(tài)協(xié)商，可auto或desirable
Switch(config-if)#switchport nonegotiate
將接口設置為nonegotiate，不發(fā)送DTP幀，如果配置為非協(xié)商，那么必須手工配置接口模式為access或trunk
Switch(config-if)#switchport mode dynamic [auto | desirable]
配置接口為協(xié)商模式
Switch#show interface trunk 查看trunk狀態(tài)
Switch#show interfaces fa0/0 switchport 查看接口二層trunk信息
Switch(config-if)#switchport trunk allowed vlan {WORD | add | all | except | none | remove}
Switch1(config-if)#switchport trunk allowed vlan ?
WORD VLAN IDs of the allowed VLANs when this port is in trunking mode
add add VLANs to the current list
all all VLANs
except all VLANs except the following
none no VLANs
remove remove VLANs from the current list
Switch(config-if)#switchport trunk allowed vlan remove 20
Switch#show interface f0/8 switchport
查看接口trunk/vlan/private-vlan信息
4. VTP
1. VTP配置
Switch1(config)#vtp domain cisco
Switch1(config)#vtp mode {server | client |transparent}
Switch1(config)#vtp password 123456
Switch1#sh vtp password
2. VTP pruning
Switch1#sh vtp status
3. 查看trunk及allowed vlan狀態(tài)
Switch1#sh int trunk
4. VTP pruning
Switch2(config)#vtp pruning
開啟VTP修剪
Switch1#sh vtp status
查看VTP狀態(tài)
5. 私有VLAN（PVLAN）
1. 創(chuàng)建主VLAN：
Vlan 100
Private-vlan primary
2. 創(chuàng)建輔助VLAN
Vlan 101
Private-vlan community
Vlan 102
Private-vlan ioslate
3. 配置主VLAN，將二層輔助VLAN關聯(lián)到主VLAN
Vlan 100
Private-vlan association 101,102
4. 將輔助VLAN映射到主VLAN的SVI接口，從而允許PVLAN入口流量的三層交換。
Interface vlan 100
Private-vlan mapping add 101,102
5. 配置接口
Interface f0/1
Switchport mode private-vlan host
Switchport private-vlan host-association 100 101 //關聯(lián)主VLAN和輔助VLAN到接口
Interface f0/2
Switchport mode private-vlan host
Switchport mode private-vlan host-association 100 102
主機接口配置
Interface f0/3
Switchport mode private-vlan promiscuous
Switchport private-vlan mapping add 100 101 //將端口映射到PLAN
混雜端口配置
6. 查看及驗證
Show pvlan mapping
PLAN配置示例
Sw(config)#vtp transparent
Sw(config)#vlan 201
Sw(config-vlan)#private-vlan isolated
Sw(config)#vlan 202
Sw(config-vlan)#private-vlan community
Sw(config)#vlan 100
Sw(config-vlan)#private-vlan primary
Sw(config-vlan)#private-vlan association 201,202
!
Sw(config)#interface fa0/24
Sw(config-if)#switchport mode private-vlan promiscuous
Sw(config-if)#switchport mode private-vlan mapping 100 201,202
Sw(config)#interface range fa 0/1 – 2
Sw(config-if)#switchport mode private-vlan host
Sw(config-if)#switchport private-vlan host-association 100 202
Sw(config)#interface range fa 0/3 – 4
Sw(config-if)#switchport mode private-vlan host
Sw(config-if)#switchport private-vlan host-association 100 201
