VLAN聚合
只使用一个网段,却可以相互隔离(二层隔离) [SW1-vlan100]dis this vlan 100 aggregate-vlan access-vlan 10 20
[SW2-vlan100]dis this vlan 100 aggregate-vlan access-vlan 10 20
[SW3-vlan100]dis this vlan 100 aggregate-vlan access-vlan 10 20
[SW1]int g0/0/1 [SW1-GigabitEthernet0/0/1]dis this interface GigabitEthernet0/0/1 port link-type access port default vlan 10 [SW1-GigabitEthernet0/0/1]int g0/0/2 [SW1-GigabitEthernet0/0/2]dis this interface GigabitEthernet0/0/2 port link-type trunk port trunk allow-pass vlan 10 20 [SW1-GigabitEthernet0/0/2]int g0/0/3 [SW1-GigabitEthernet0/0/3]dis this interface GigabitEthernet0/0/3 port link-type access port default vlan 20
[SW2]int g0/0/1 [SW2-GigabitEthernet0/0/1]dis this interface GigabitEthernet0/0/1 port link-type trunk port trunk allow-pass vlan 10 20 [SW2-GigabitEthernet0/0/1]int g0/0/2 [SW2-GigabitEthernet0/0/2]dis this interface GigabitEthernet0/0/2 port link-type access port default vlan 20 [SW2-GigabitEthernet0/0/2]int g0/0/3 [SW2-GigabitEthernet0/0/3]dis this interface GigabitEthernet0/0/3 port link-type access port default vlan 10
[SW3]int g0/0/1 [SW3-GigabitEthernet0/0/1]dis this interface GigabitEthernet0/0/1 port link-type trunk port trunk allow-pass vlan 10 20 [SW3-GigabitEthernet0/0/1]int g0/0/3 [SW3-GigabitEthernet0/0/3]dis this interface GigabitEthernet0/0/3 port link-type trunk port trunk allow-pass vlan 10 20
PC1pingPC4 在SW1 g0/0/2上抓包,发现数据包打的是10的标签,说明VLAN100只有网关的作用,不作为标签转换
PC1和PC2不能通信的原因:不同VLAN,ARP不能到达PC3
解决办法: 1、三层通信(无法实现,同网段通信,PC1只会直接请求PC2的Mac地址) 2、让PC1能请求到PC2的MAC地址(开启ARP代理)
[SW3-Vlanif100]dis this interface Vlanif100 ip address 10.1.1.254 255.255.255.0 arp-proxy inter-sub-vlan-proxy enable
同网段不同VLAN通信 PC1-----网关------PC2 1、PC1发送ARP请求(目的IP为PC2)------- 被网关收到 2、网关收到之后也发送ARP请求(广播),目的IP为PC2-----PC2收到 3、PC2单播回复ARP响应给网关(IP:PC2,Mac:PC2) 4、网关给PC1单播回复ARP响应(IP:PC2,Mac:网关)
最后PC1请求到的是网关的Mac地址
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