Nortel 2033 Installation And Operation Manual page 490

Page 490 of 600
553-3001-368 Standard 20.00
Appendix B: 802.1Q VLAN description
DATA (PC Port) VLAN packet handling
Packets processed to and from the PC port operate as follows:
PC Port (Ingress direction)
– DATA VLAN disabled—all traffic received on the PC port is
switched based on MAC address. The packets are not modified
in any way.
– DATA VLAN enabled—all untagged packets received on the
PC port have the 802.1Q header appended and the VLAN ID is
set to the value that was manually configured in the Data VLAN
field. Any packet arriving on the PC port that is already tagged
is dropped.
PC Port (Egress direction)
– DATA VLAN disabled—all traffic received on the PC port has
the 802.1Q header appended and the VLAN ID is set to the
value which was manually configured in the DATA VLAN
field. Any packet arriving on the PC port which is already
tagged is dropped.
– DATA VLAN enabled—all traffic is forwarded to the PC port
based on a review of the MAC address and the 802.1Q value
that was manually configured in the DATA VLAN field. Traffic
is forwarded out the PC port only if the packets contain the
DATA VLAN tag. Untagged traffic and traffic without the
DATA VLAN tag is dropped.
DATA (PC Port) VLAN Tag Stripping
DATA VLAN Tag Stripping can be configured in the Network Configuration
menu. To enable DATA VLAN Tag Stripping, select the PC-Port Untag All
check box, DATA VLAN Tag Stripping can be enabled or disabled
independent of enabling VLAN support on the PC Port.
If the DATA VLAN Tag Stripping is disabled, the packet is sent to the PC
Port unmodified. If the DATA VLAN Tag Stripping is enabled, the 802.1Q
header if one exists, is removed from the packet before the packet is
forwarded to the PC port.
December 2006