Nortel Networks 1000BASE-ZX, 1000BASE-SX, 1000ASE-XD, 1000BASE-LX manual BS45013A, BS45014A, Port

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

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BS45013A

Chapter 2 Network configuration 59

In Figure 15, 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.

Figure 15 802.1Q tag assignment

 

 

 

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 4Port 5

Tagged member of VLAN 2

Untagged member of VLAN 2

BS45013A

As shown in Figure 16, 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.

Figure 16 802.1Q tagging (after 802.1Q tag assignment)

PVID = 2

Port 4BS45014A

Port 1

 

Port 2

 

Port 3

 

802.1Q Switch

 

 

 

 

 

Port 6

 

Port 7

 

Port 8

Manual backgroundPort 5

Tagged member of VLAN 2

CRC Data Tag SA DA

Untagged member

CRC* (*Recalculated)

of VLAN 2

 

 

Data

 

 

8100

 

Priority

 

CFI

 

VID = 2

 

 

 

 

 

 

 

 

 

 

 

 

16 bits

 

3 bits

 

1 bit

 

12 bits

 

 

 

 

 

 

 

SA

Outgoing

untagged packet

 

changed

DA

(tag removed)

 

After

Key

 

 

 

Priority

- User_priority

CFI

- Canonical format indicator

VID

- VLAN identifier

 

 

BS45014A

Using the BayStack 420 10/100/1000 Switch

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Nortel Networks 1000BASE-ZX, 1000BASE-SX, 1000ASE-XD, 1000BASE-LX manual BS45013A, BS45014A, Port