
Chapter 2 Ne twork configuration 109
Using the Business Policy Switch 2000 Version 1.2
Figure 21 Policy-based VLAN assignment
As shown in Figure 22, the untagged packet is marked (tagged) as it leaves the switch through port 5, which is configured as a tagged member of VLAN 3. The untagged packet remains unchanged as it leaves the switch through port 7, which is configured as an untagged member of VLAN 3.Figure 22 802.1Q tagging (after policy-based VLAN assignment)
Port 6
DASADataCRC
BS45011B
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 3
Tagged member
of VLAN 3
Before
Policy VLAN = 3
BS45012B
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 3
Untagged member
of VLAN 3
After
DA
SA
Data
CRC
(*Recalculated)
Outgoing
untagged packet
(unchanged)
DASADataCRC* Tag
VID = 3Priority
16 bits 3 bits 1 bits 12 bits
8100 CFI
Policy VLAN = 3