
802.1ad (QinQ) 802.1q. , , 2 OSI ( L3 )
? , .

4 (32 ) :
- TPID (Tag Protocol Identifier): 0x8100 802.1q (VLAN) , 802.1ad(QinQ) : 0x88a8.

- TCI (Tag Control Information): 16 .
:
- PCP(Priority) - 3- , IEEE 802.1p . (3 )
- Drop eligible indicator (DEI) ( CFI - Canonical Format Indicator) - PCP , . (1 )
- VID (VLAN Identifier) - VLAN ID . 12 , 2^12 = 4096 VLAN . , 0 4095( 0x000 0xFFF) , 4094 . (12 )
QinQ? VID VLAN (4094) 802.1ad, VLAN. (4094*4094 = 16760836 - .)
dump 802.1q:

802.1ad QinQ :

, . ( ), QinQ .

.

VPC1 VPC2 , .
- VPC1 : 172.16.20.1/24
- VPC2 : 172.16.20.2/24
Mikrotik, access trunk
/interface bridge add name=bridge vlan-filtering=yes /interface bridge port add bridge=bridge interface=ether1 pvid=100 add bridge=bridge interface=ether2 /interface bridge vlan add bridge=bridge tagged=ether2 vlan-ids=100
Mikrotik4
/interface bridge add name=bridge vlan-filtering=yes /interface bridge port add bridge=bridge interface=ether1 pvid=100 add bridge=bridge interface=ether2 /interface bridge vlan add bridge=bridge tagged=ether2 vlan-ids=100
: Mikrotik2
/interface bridge add ether-type=0x88a8 name=bridge vlan-filtering=yes /interface bridge port add bridge=bridge interface=ether1 pvid=200 tag-stacking=yes add bridge=bridge interface=ether2 /interface bridge vlan add bridge=bridge tagged=ether1 vlan-ids=100 add bridge=bridge tagged=ether2 vlan-ids=200
Mikrotik3
/interface bridge add ether-type=0x88a8 name=bridge vlan-filtering=yes /interface bridge port add bridge=bridge interface=ether1 add bridge=bridge interface=ether2 pvid=200 tag-stacking=yes /interface bridge vlan add bridge=bridge tagged=ether2 vlan-ids=100 add bridge=bridge tagged=ether1 vlan-ids=200
Mikrotik. , Q-in-Q, . !