BayStack 450 10/100/1000 Series Switches

302401-D Rev 00 1-35

In Figure 1-17, untagged incoming packets are assigned directly to VLAN 2

(PVID = 2). Port 5 is configured as a tagged member of VLAN 2, and port 7 is

configured as an untagged member of VLAN 2.

Figure 1-17. 802.1Q Tagging (1 of 4)

As shown in Figure 1-18, 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 1-18. 802.1Q Tagging (2 of 4)

Port 6
DASADataCRC
BS45011A
Port 7 Port 8
Port 1
Port 4
Port 5
Port 2 Port 3
802.1Q Switch
PVID = 2
Untagged packet
Untagged member
of VLAN 2
Tagged member
of VLAN 2
Before
BS45012A
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 memeber
of VLAN 2
After
DA
SA
Data
CRC
(*Recalculated)
Outgoing
untagged packet
(unchanged)
DASADataCRC* Tag
VID = 2Priority
16 bits 3 bits 1 bits 12 bits
8100 CFI
kombk.book Page 35 Tuesday, June 29, 1999 3:25 PM