Using the BayStack 450 10/100/1000 Series Switch
1-36 302401-D Rev 00

In Figure 1-19, tagged inco ming pack ets ar e assigned di rectly t o VLAN 2 because

of the tag assignment in the packet. Port 5 is configured as a tagged membe r of

VLAN 2, and port 7 is configured as an untagged member of VLAN 2.

Figure 1-19. 802.1Q Tagging (3 of 4)

As shown in Figure 1-20, 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 1-20. 802.1Q Tagging (4 of 4)

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
Before
BS45014A
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 member
of VLAN 2
After
DA
SA
Data
CRC* (*Recalculated)
Outgoing
untagged packet
changed
(tag removed)
DASADataCRC Tag
VID = 2Priority
16 bits 3 bits 1 bit 12 bits
8100 CFI
kombk.book Page 36 Tuesday, June 29, 1999 3:25 PM