VLAN How it works

1. VLAN Datapath Walkthrough
Gary Jan

2. VLAN Advanced - Ingress Port Rules
Ingress Port Rules:

3. VLAN Advanced - Egress Port Rules
Egress Port Rules:

4. Ingress Port Rule
Untagged Frame
Tagged & VID= 0
Tagged & VID= X
Associated with Port’s PVID
Associated with Port’s PVID
Associated with VID= X

5. Egress Port Rule
Egress Port’s PVID
Else
Egress Port’s PVID
Configuration
(i.e. Tag/Untag)
Drop
Port Type= Edge Port
Port Type= Trunk Port
Egress Port’s PVID
VID & Port is a member of VID
Not member of VID
Egress Port’s PVID
Configuration
Tagged VID
Drop

6. Example-1
Switch 4
Switch 2 B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 1
Port 3
Edge Port
Untagged
PVID= 3
A

7. Example-1
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 1
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A Data

8. Example-1
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 1
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A Data
Associated with PVID=3
Untagged Frame
Tagged & VID= 0
Tagged & VID= X
Associated with Port’s PVID
Associated with Port’s PVID
Associated with VID= X
Ingress Rule

9. Example-1
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 1
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A 3 Data
Egress Rule- Edge Port
Egress Port’s PVID
VID & Port is a
member of VID
Not member of VID
Egress Port’s PVID
Configuration
Tagged VID
Drop

10. Example-1
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 1
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A 3 Data
Associated with VID= 3
Untagged Frame
Tagged & VID= 0
Tagged & VID= X
Associated with Port’s PVID
Associated with Port’s PVID
Associated with VID= X
Ingress Rule

11. Example-1
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 1
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A 3 Data
Egress Rule- Edge Port
Egress Port’s PVID
VID & Port is a
member of VID
Not member of VID
Egress Port’s PVID
Configuration
Tagged VID
Drop

12. Example-1
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 1
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A 3 Data
Associated with VID= 3
Untagged Frame
Tagged & VID= 0
Tagged & VID= X
Associated with Port’s PVID
Associated with Port’s PVID
Associated with VID= X
Ingress Rule

13. Example-1
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Tagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 1
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A Data

14. Example-2
Switch 4
Switch 2
A
B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Untagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 3
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 1
Port 3
Edge Port
Untagged
PVID= 3

15. Example-2
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Untagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 3
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 1
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A Data

16. Example-2
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Untagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 3
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 1
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A Data
Associated with PVID=3
Untagged Frame
Tagged & VID= 0
Tagged & VID= X
Associated with Port’s PVID
Associated with Port’s PVID
Associated with VID= X
Ingress Rule

17. Example-2
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Untagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 3
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 1
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A Data
Egress Rule- Edge Port
Egress Port’s PVID
VID & Port is a
member of VID
Not member of VID
Egress Port’s PVID
Configuration
Tagged VID
Drop

18. Example-2
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Untagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 3
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 1
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A Data
Associated with VID= 3
Untagged Frame
Tagged & VID= 0
Tagged & VID= X
Associated with Port’s PVID
Associated with Port’s PVID
Associated with VID= X
Ingress Rule

19. Example-2
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Untagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 3
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 1
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A 3 Data
Egress Rule- Edge Port
Egress Port’s PVID
VID & Port is a
member of VID
Not member of VID
Egress Port’s PVID
Configuration
Tagged VID
Drop

20. Example-2
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Untagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 3
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 1
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A 3 Data
Associated with VID= 3
Untagged Frame
Tagged & VID= 0
Tagged & VID= X
Associated with Port’s PVID
Associated with Port’s PVID
Associated with VID= X
Ingress Rule

21. Example-2
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Tagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 3
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 3
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A Data

22. Example-3
Switch 4
Switch 2
A
B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Tagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 3
Port 3
Edge Port
Untagged
PVID= 3

23. Example-3
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Tagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 3
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A Data

24. Example-3
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Tagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 3
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A Data
Associated with PVID=3
Untagged Frame
Tagged & VID= 0
Tagged & VID= X
Associated with Port’s PVID
Associated with Port’s PVID
Associated with VID= X
Ingress Rule

25. Example-3
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Tagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 3
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A 3 Data
Egress Rule- Edge Port
Egress Port’s PVID
VID & Port is a
member of VID
Not member of VID
Egress Port’s PVID
Configuration
Tagged VID
Drop

26. Example-3
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Tagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 3
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A 3 Data
Associated with VID= 3
Untagged Frame
Tagged & VID= 0
Tagged & VID= X
Associated with Port’s PVID
Associated with Port’s PVID
Associated with VID= X
Ingress Rule

27. Example-3
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Tagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 3
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A 3 Data
Egress Rule- Edge Port
Egress Port’s PVID
VID & Port is a
member of VID
Not member of VID
Egress Port’s PVID
Configuration
Tagged VID
Drop

28. Example-3
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Tagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 3
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A 3 Data
Associated with VID= 3
Untagged Frame
Tagged & VID= 0
Tagged & VID= X
Associated with Port’s PVID
Associated with Port’s PVID
Associated with VID= X
Ingress Rule

29. Example-3
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Tagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 3
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A Data

30. Example-3
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
PVID= 3
Port 5
Trunk Port
Tagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 3
Port 3
Edge Port
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A Data

31. Example-3
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
PVID= 3
Port 5
Trunk Port
Tagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 3
Port 3
Edge Port
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A Data
Untagged Frame
Tagged & VID= 0
Tagged & VID= X
Associated with Port’s PVID
Associated with Port’s PVID
Associated with VID= X
Ingress Rule
Associated with PVID=3

32. Example-3
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
PVID= 3
Port 5
Trunk Port
Tagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 3
Port 3
Edge Port
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A Data
Egress Rule- Trunk Port
Egress Port’s PVID
Else
Egress Port’s PVID
Configuration
(i.e. Tag/Untag)
Drop

33. Example-3
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
PVID= 3
Port 5
Trunk Port
Tagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 3
Port 3
Edge Port
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A Data
Untagged Frame
Tagged & VID= 0
Tagged & VID= X
Associated with Port’s PVID
Associated with Port’s PVID
Associated with VID= X
Ingress Rule
Associated with PVID= 1

34. Example-3
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
PVID= 3
Port 5
Trunk Port
Tagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 3
Port 3
Edge Port
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A Data
Egress Rule- Trunk Port
Egress Port’s PVID
Else
Egress Port’s PVID
Configuration
(i.e. Tag/Untag)
Drop

35. Example-3
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
PVID= 3
Port 5
Trunk Port
Tagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 3
Port 3
Edge Port
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A Data
Untagged Frame
Tagged & VID= 0
Tagged & VID= X
Associated with Port’s PVID
Associated with Port’s PVID
Associated with VID= X
Ingress Rule
Associated with PVID= 3

36. Example-3
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
PVID= 3
Port 5
Trunk Port
Tagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 3
Port 3
Edge Port
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
B A Data
Egress Rule- Edge Port
Egress Port’s PVID
VID & Port is a
member of VID
Not member of VID
Egress Port’s PVID
Configuration
Tagged VID
Drop

37. Example-4
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Tagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 3
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
1 A Data

38. Example-4
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Tagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 3
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
1 A Data
Associated with PVID=3
Untagged Frame
Tagged & VID= 0
Tagged & VID= X
Associated with Port’s PVID
Associated with Port’s PVID
Associated with VID= X
Ingress Rule

39. Example-4
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Tagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 3
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
A 1 Data
Respond in native Ethernet Frame
Associated with PVID= 1
Egress Rule- Edge Port
Egress Port’s PVID
VID & Port is a
member of VID
Not member of VID
Egress Port’s PVID
Configuration
Tagged VID
Drop

40. Example-4
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Tagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 3
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
4 A Data

41. Example-4
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Tagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 3
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
4 A Data
Associated with PVID=3
Untagged Frame
Tagged & VID= 0
Tagged & VID= X
Associated with Port’s PVID
Associated with Port’s PVID
Associated with VID= X
Ingress Rule

42. Example-4
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Tagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 3
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
4 A 3 Data
Egress Rule- Trunk Port
Egress Port’s PVID
Else
Egress Port’s PVID
Configuration
(i.e. Tag/Untag)
Drop

43. Example-4
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
Untagged
PVID= 3
Port 5
Trunk Port
Tagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 3
Port 3
Edge Port
Untagged
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
4 A 3 Data
Associated with VID= 3
Untagged Frame
Tagged & VID= 0
Tagged & VID= X
Associated with Port’s PVID
Associated with Port’s PVID
Associated with VID= X
Ingress Rule

44. Example-4
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
PVID= 3
Port 5
Trunk Port
Tagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 3
Port 3
Edge Port
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
A 4 Data
Egress Rule- Trunk Port
Egress Port’s PVID
Else
Egress Port’s PVID
Configuration
(i.e. Tag/Untag)
Drop

45. Example-4
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
PVID= 3
Port 5
Trunk Port
Tagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 3
Port 3
Edge Port
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
A 4 Data
Untagged Frame
Tagged & VID= 0
Tagged & VID= X
Associated with Port’s PVID
Associated with Port’s PVID
Associated with VID= X
Ingress Rule
Associated with PVID= 3

46. Example-4
Switch 4
Switch 2 MAC B
Switch 1
Switch 3
Port 3
Edge Port
PVID= 3
Port 5
Trunk Port
Tagged
PVID= 3
Port 1
Trunk Port
Untagged
PVID= 1
Port 5
Trunk Port
Untagged
PVID= 1
Port 1
Trunk Port
Untagged
PVID= 3
Port 3
Edge Port
PVID= 3
MAC A
DA SA VID
DA: Destination MAC
SA: Source MAC
VID: VLAN ID
Data
A 4 Data
Egress Rule- Edge Port
Egress Port’s PVID
VID & Port is a
member of VID
Not member of VID
Egress Port’s PVID
Configuration
Tagged VID
Drop