Using the BayStack 350 10/100/1000 Series Switch

In Figure 1-12, tagged incoming packets are assigned directly to VLAN 2 because of the tag assignment in the packet. Port 5 is configured as a tagged member of VLAN 2, and port 7 is configured as an untagged member of VLAN 2.

 

 

 

PVID = 2

 

 

 

 

 

Tagged packet

 

4

 

 

 

 

 

 

CRC

Data

Tag

SA

DA

 

Port

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Before

 

 

 

Port 1

 

Port 2

 

Port 3

 

802.1Q Switch

 

 

 

 

 

Port 6

 

Port 7

 

Port 8

Port 5

Tagged member of VLAN 2

Untagged member of VLAN 2

BS35013A

Figure 1-12. 802.1Q Tagging (3 of 4)

As shown in Figure 1-13, the tagged packet remains unchanged as it leaves the switch through port 5, which is configured as a tagged member of VLAN 2. However, the tagged packet is stripped (untagged) as it leaves the switch through port 7, which is configured as an untagged member of VLAN 2.

PVID = 2

Port 4

Port 1

 

Port 2

 

Port 3

 

802.1Q Switch

 

 

 

 

 

Port 6

 

Port 7

 

Port 8

Port 5

Tagged member of VLAN 2

CRC Data Tag SA DA

Untagged member

CRC*

(*Recalculated)

of VLAN 2

 

 

Data

 

 

 

 

SA

Outgoing

 

untagged packet

 

 

changed

 

DA

 

(tag removed)

 

 

8100

 

Priority

 

 

CFI

 

VID = 2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

16 bits

 

3 bits

 

 

1 bit

 

12 bits

 

 

 

 

 

 

 

 

 

 

 

 

After

 

 

 

 

 

Key

 

 

 

 

 

 

 

 

 

 

 

Priority

- User_priority

 

 

 

 

 

 

 

 

 

 

 

 

CFI

- Canonical format indicator

 

 

 

VID

- VLAN identifier

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BS35014A

Figure 1-13. 802.1Q Tagging (4 of 4)

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304376-B Rev 00

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Nortel Networks 350 manual 12 .1Q Tagging 3