Independent Vlan Learning - Avaya 2330 Manual

Figure 6: VLAN tagging
In the Secure Router 2330/4134, your port level configuration determines whether tagged
frames are sent and received. Tagging is set as true or false for the port and is applied to all
VLANs on that port.
The Secure Router 2330/4134 associates a frame with a VLAN based on the data content of
the frame and the configuration of the destination port. Whether the frame is tagged or
untagged dictates how that frame is treated.
A Secure Router 2330/4134 port with tagging enabled sends frames explicitly tagged with a
VLAN ID. Tagged ports are typically used to multiplex traffic belonging to multiple VLANs to
other IEEE-802.1Q-compliant devices. If tagging is disabled on a Secure Router 2330/4134
port, it does not send tagged frames. An untagged port connects a Secure Router 2330/4134
to devices that do not support IEEE 802.1Q tagging. If a tagged frame is forwarded out a port
on which tagging is set to false, the device removes the tag from the frame before sending it
out the port.
If a tagged frame is received on a tagged port, with a VLAN ID specified in the tag, the Secure
Router directs it to that VLAN, if it is present.
For untagged frames, VLAN membership is implied from the content of the frame itself. For
untagged frames received on a tagged port, you can configure the port to either discard or
accept the frame. If you configure a tagged port to accept untagged frames, the port must be
assigned to a port-based VLAN.

Independent VLAN learning

In the Secure Router 2330/4134, each VLAN has its own, independent, forwarding database.
That is, the same MAC address can be learned in different VLANs; and, based on the VLAN
receiving traffic for this address, the device is able to forward to this MAC address without any
confusion. This means that before the device can look up the source or destination MAC
address in a received frame, or before it can decide whether to bridge or to route a frame, it
must first determine to which VLAN the frame belongs.
Independent VLAN learning mode is used to learn MAC addresses in the context of the VLAN
to which they belong.
Configuration — Layer 2 Ethernet
VLANs
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