C
HAPTER
6
| VLAN Configuration
IEEE 802.1Q VLANs
– 168 –
since traffic must pass through a configured Layer 3 link to reach a
different VLAN.
This switch supports the following VLAN features:
â—† Up to 256 VLANs based on the IEEE 802.1Q standard
â—† Distributed VLAN learning across multiple switches using explicit or
implicit tagging and GVRP protocol
â—† Port overlapping, allowing a port to participate in multiple VLANs
â—† End stations can belong to multiple VLANs
â—† Passing traffic between VLAN-aware and VLAN-unaware devices
â—† Priority tagging
Assigning Ports to VLANs
Before enabling VLANs for the switch, you must first assign each port to
the VLAN group(s) in which it will participate. By default all ports are
assigned to VLAN 1 as untagged ports. Add a port as a tagged port if you
want it to carry traffic for one or more VLANs, and any intermediate
network devices or the host at the other end of the connection supports
VLANs. Then assign ports on the other VLAN-aware network devices along
the path that will carry this traffic to the same VLAN(s), either manually or
dynamically using GVRP. However, if you want a port on this switch to
participate in one or more VLANs, but none of the intermediate network
devices nor the host at the other end of the connection supports VLANs,
then you should add this port to the VLAN as an untagged port.
N
OTE
:
VLAN-tagged frames can pass through VLAN-aware or VLAN-
unaware network interconnection devices, but the VLAN tags should be
stripped off before passing it on to any end-node host that does not
support VLAN tagging.
Figure 60: VLAN Compliant and VLAN Non-compliant Devices
VLAN Classification – When the switch receives a frame, it classifies the
frame in one of two ways. If the frame is untagged, the switch assigns the
frame to an associated VLAN (based on the default VLAN ID of the
VA
VA: VLAN Aware
VU: VLAN Unaware
VA
tagged frames
VA VUVA
tagged
frames
untagged
frames
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