Nortel Networks 1000BASE-LX, 1000BASE-SX, 1000ASE-XD, 1000BASE-ZX manual bits, Port

Models: 1000ASE-XD 1000BASE-ZX 1000BASE-SX 1000BASE-LX

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Port 5

58 Chapter 2 Network configuration

Figure 13 Port-based VLAN assignment

 

 

PVID = 2

 

 

Untagged packet

 

 

 

 

 

 

 

4

 

CRC

Data

SA

DA

 

Port

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Before

 

 

 

 

 

Port 1

 

Port 2

 

Port 3

 

802.1Q Switch

 

 

 

 

 

Port 6

 

Port 7

 

Port 8

16 bitsPort 5

Tagged member of VLAN 2

Untagged member of VLAN 2

BS45011A

As shown in Figure 14, the untagged packet is marked (tagged) as it leaves the switch through port 5, which is configured as a tagged member of VLAN 2. The untagged packet remains unchanged as it leaves the switch through port 7, which is configured as an untagged member of VLAN 2.

Figure 14 802.1Q tagging (after port-based VLAN assignment)

PVID = 2

Port 43 bits

Port 1

 

Port 2

 

Port 3

 

 

802.1Q Switch

 

 

 

 

 

 

 

Port 6

 

Port 7

 

Port 8

 

Tagged member of VLAN 2

5

 

 

 

 

 

 

Port

 

CRC*

Data

Tag

SA

DA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(*Recalculated)

Untagged member

CRC

of VLAN 2

 

 

Data

Outgoing SA

 

8100

 

Priority

 

CFI

 

VID = 2

 

 

 

 

 

 

 

 

 

 

 

 

16 bits

 

3 bits

 

1 bits

 

12 bits

 

 

 

 

 

 

 

 

 

 

After

 

 

 

 

untagged packet (unchanged)

DA

Key

 

Priority

- User_priority

CFI

- Canonical format indicator

VID

- VLAN identifier

 

 

BS45012A

209418-A

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Image 58
Nortel Networks 1000BASE-LX, 1000BASE-SX, 1000ASE-XD, 1000BASE-ZX manual bits, Port