Nortel BayStack 410 24T Using Manual page 68

Using the BayStack 410-24T 10BASE-T Switch
In Figure
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.
Tagged packet
CRC Data Tag SA
Before
Figure 1-19. 802.1Q Tag Assignment
As shown in
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.
PVID = 2
Port 1
Port 6
Untagged member
of VLAN 2
Figure 1-20. 802.1Q Tagging (After 802.1Q Tag Assignment)
1-40
1-19, tagged incoming packets are assigned directly to VLAN 2 because
PVID = 2
DA
Figure 1-20, the tagged packet remains unchanged as it leaves the
Port 2 Port 3
802.1Q Switch
Port 7 Port 8
CRC* (*Recalculated)
Data
Outgoing
SA
untagged packet
changed
DA
(tag removed)
Port 1 Port 2 Port 3
802.1Q Switch
Port 6 Port 7 Port 8
Untagged member
of VLAN 2
Tagged member
of VLAN 2
CRC Data Tag
8100
16 bits
Key
Priority - User_priority
CFI - Canonical format indicator
VID - VLAN identifier
Tagged member
of VLAN 2
BS41018A
SA DA
Priority CFI VID = 2
3 bits 1 bit 12 bits
After
BS41019A
309985-B Rev 00