QinQ工作原理

一、基礎知識

二、場景

三、配置

SW1

interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 20 30
#
interface GigabitEthernet0/0/2
 port link-type access
 port default vlan 20
#
interface GigabitEthernet0/0/3
 port link-type access
 port default vlan 30
#

SW2

interface GigabitEthernet0/0/1
 port link-type dot1q-tunnel
 port default vlan 10
#
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 10

SW3

interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 10
#
interface GigabitEthernet0/0/2
 port link-type dot1q-tunnel
 port default vlan 10
#

SW4

interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 20 30
#
interface GigabitEthernet0/0/2
 port link-type access
 port default vlan 20
#
interface GigabitEthernet0/0/3
 port link-type access
 port default vlan 30

業務名稱	vlan區間	外層vlan
租戶1	20	10
租戶2	30	10

PC1中的數據——>進入SW2的GE0/0/1的報文封裝外層vlan 10,反之相同

SW2<——>SW3允許VLAN10的報文通過