User guide

92 ExtremeWare 7.2e Installation and User Guide
Virtual LANs (VLANs)
Figure 15: Logical diagram of tagged and untagged traffic
In Figure 14 and Figure 15:
• The trunk port on each switch carries traffic for both VLAN Marketing and VLAN Sales.
• The trunk port on each switch is tagged.
• The server connected to port 33 on system 1 has a NIC that supports 802.1Q tagging.
• The server connected to port 33 on system 1 is a member of both VLAN Marketing and VLAN Sales.
• All other stations use untagged traffic.
As data passes out of the switch, the switch determines if the destination port requires the frames to be
tagged or untagged. All traffic coming from and going to the server is tagged. Traffic coming from and
going to the trunk ports is tagged. The traffic that comes from and goes to the other stations on this
network is not tagged.
Mixing Port-Based and Tagged VLANs
You can configure the switch using a combination of port-based and tagged VLANs. A given port can
be a member of multiple VLANs, with the stipulation that only one of its VLANs uses untagged traffic.
In other words, a port can simultaneously be a member of one port-based VLAN and multiple
tag-based VLANs.
NOTE
For the purposes of VLAN classification, packets arriving on a port with an 802.1Q tag containing a
VLANid of zero are treated as untagged.
VLAN Names
Each VLAN is given a name that can be up to 32 characters. VLAN names can use standard
alphanumeric characters. The following characters are not permitted in a VLAN name:
• Space
• Comma
ES4K020
*Tagged Ports
Sales
System 1
Port 33 *
Port 1X *
System 2
Slot 1, Port 1 *
Marketing
System 1
Ports 1-8
System 2
Slot 1, Port 2
Slot 2, Ports 1-8 & 17-24
System 1
Ports 25-32 & 4X
System 2
Slot 1, Port 3
Slot 1, Port 4
Slot 2, Ports 9-16 & 25-32