User's Manual

Table Of Contents
Base Station Configuration Tsunami MP.16 3650 System User Guide
Networking Configuration
51
VLANs
Virtual Local Area Networks (VLANs) are logical groupings of network resources behind one or more BS and SS.
Groupings are based on VLAN IDs. If a data packet is tagged with a VLAN ID, it is called a VLAN-tagged packet. If there
is no VLAN ID, the packet is called an untagged packet. All VLAN IDs must be stored in the VLAN ID List. Up to 256
individual VLAN IDs may be stored in this list.
See VLAN Modes: Introduction for detailed information on MP.16 operation in each of these modes.
See VLAN ID List for VLAN ID List configuration instructions.
See Bridging for VLAN Mode configuration instructions.
VLAN Modes: Introduction
Depending on the VLAN capabilities of sub-networks and devices behind the BS and SS, you can configure the BS and
SS for various VLAN modes.
The BS can be configured to operate in one of three VLAN modes:
Transparent
•Trunk
•Mixed
Depending on the BS mode selected, the SS can be configured to operate in one of four VLAN modes:
Transparent: Available when the BS is in Transparent mode.
Trunk: Available when the BS is in Trunk mode.
Access: Available when the BS is in either Transparent or Trunk mode.
Mixed: Available when the BS is in Trunk mode.
See the following sections for more information on the functionality of each mode.
BS in Transparent Mode
When the BS is in Transparent mode, the SS may be in either Transparent or Access mode.
When both the BS and SS are in Transparent mode VLAN-tagged or untagged packets are accepted and forwarded by
the BS and SS, unless they are discarded due to PIR restrictions (see Networking Parameters in the Service Class
Creation section). The BS and SS will process both tagged and untagged packets from both the wireless and Ethernet
interfaces.
When the BS is in Transparent mode and the SS is in Access mode, the SS processes only untagged packets from the
Ethernet interface, discarding any tagged packets it receives. Upon receiving an untagged packet, the SS tags it with an
assigned VLAN ID and priority provisioned by the BS. When the SS receives tagged packets from the wireless interface,
it removes the VLAN tag and sends only untagged packets to the Ethernet interface.
Figure 3-8 illustrates the exchange of packets when the BS is in Transparent mode and registered SSs are in either
Transparent or Access mode. Ta b l e 3- 1 provides a detailed summary of BS and SS functionality when the BS is in
Transparent mode.