Blade ICE G8124 Manuale Utente
BLADEOS 6.5.2 Application Guide
BMD00220, October 2010
Chapter 6: VLANs
93
Figure 4
802.1Q tag assignment
, 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.
(untagged) as it leaves the switch through port 7, which is configured as an untagged member of
VLAN 2.
Figure 5
802.1Q tagging (after 802.1Q tag assignment)
P ort 6
DA
S A
Tag
Data
C R C
Tagged packet
B S
0 3A
P ort 7
P ort 8
P ort 1
Po
rt
4
Po
rt
5
P ort 2
P ort 3
802.1Q S witch
P V ID = 2
Untagged member
of V LAN 2
of V LAN 2
Tagged member
of V LAN 2
of V LAN 2
B
efore
Port 6
Port 7
Port 8
Port 1
Port 4
Port 5
Port 2
Port 3
802.1Q Switch
Key
Priority
CFI
VID
CFI
VID
- User_priority
- Canonical format indicator
- VLAN identifier
- Canonical format indicator
- VLAN identifier
PVID = 2
Tagged member
of VLAN 2
of VLAN 2
Untagged member
of VLAN 2
After
DA
SA
Data
CRC*
(*Recalculated)
Outgoing
untagged packet
changed
(tag removed)
untagged packet
changed
(tag removed)
DA
SA
Data
CRC
Tag
VID = 2
Priority
16 bits
3 bits
1 bit
12 bits
8100
CFI