144 CN4093 Application Guide for N/OS 8.4
AsshowninFigure 4,theuntaggedpacketismarked(tagged)asitleavesthe
switchthroughport5,whichisconfiguredasataggedmemberofVLAN2.The
untaggedpacketremainsunchangedasitleavestheswitchthroughport7,which
isconfiguredasanuntaggedmemberofVLAN
2.
Figure 4. 802.1Qtagging(afterport‐basedVLANassignment)
InFigure 5,taggedincomingpacketsareassigneddirectlytoVLAN2becauseof
thetagassignmentinthepacket.Port5isconfiguredasataggedmemberofVLAN
2andport7isconfiguredasanuntaggedmemberofVLAN2.
Figure 5. 802.1Q
tagassignment
BS45012A
Port 6 Port 7 Port 8
Port 1
Port 4
Port 5
Port 2 Port 3
802.1Q Switch
Key
Priority
CFI
VID
- User_priority
- Canonical format indicator
- VLAN identifier
PVID = 2
Tagged member
of VLAN 2
Untagged memeber
of VLAN 2
After
DA
SA
Data
CRC
(*Recalculated)
Outgoing
untagged packet
(unchanged)
DASADataCRC* Tag
VID = 2Priority
16 bits 3 bits 1 bits 12 bits
8100 CFI
Port 6
DASATagDataCRC
Tagged packet
BS45013A
Port 7 Port 8
Port 1
Port 4
Port 5
Port 2 Port 3
802.1Q Switch
PVID = 2
Untagged member
of VLAN 2
Tagged member
of VLAN 2
B
e
f
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