SVI：众所周知交换机是没有ip地址的，如果要配置的话一般需要本地console连接设置，这样在后期运维过程中不得不总是要跑到现场调试，SVI配置就是将交换机的一个vlan口，设置ip地址在配合Telnet远程登录权限，这样后期运维人员就可以远程通过ip地址直接Telnet登录到交换机内部进配置。
LSW1:
LSW1\]valn 10 20 \[LSW1\]int vlanif 10 创建交换机虚拟接口vlanif 10 (SVI) \[LSW1-Vlanif10\]ip add 192.168.10.1 24 配置ip地址作为vlan10网关 \[LSW1\]int vlanif 20 \[LSW1-Vlanif20\]ip add 192.168.20.1 24 配置ip地址作为vlan20网关 注意：可以将三层交换机抽象成一台路由器，vlanif接口就是路由器的接口。 ****二层SVI****  sw2: \[LSW1\]vlan batch 10 30 \[LSW1\]interface Ethernet0/0/1 port link-type trunk port trunk allow-pass vlan 2 to 4094 # interface Ethernet0/0/2 port link-type access port default vlan 10 # interface Ethernet0/0/3 port link-type access port default vlan 30 sw3: vlan 20 interface Ethernet0/0/1 port link-type trunk port trunk allow-pass vlan 2 to 4094 # interface Ethernet0/0/2 port link-type access port default vlan 20 sw1: vlan batch 10 20 30 interface Vlanif10 ip address 192.168.10.1 255.255.255.0 # interface Vlanif20 ip address 192.168.20.1 255.255.255.0 # interface Vlanif30 ip address 192.168.30.1 255.255.255.0 # interface GigabitEthernet0/0/1 port link-type trunk port trunk allow-pass vlan all # interface GigabitEthernet0/0/2 port link-type trunk port trunk allow-pass vlan all