Teleste MPH241 - Virtual LANs (VLANs) Introduction; VLAN Configuration Per Port; Packet Type Handling

62 MPH200 series video encoders WebUI user manual
Virtual LANs (VLANs) – introduction
VLANs are logical partitions of the physical LAN. VLANs are collections of
switching ports that comprise a single broadcast domain. Packets are
classied as belonging to a VLAN based on either the VLAN tag or based
on a combination of the ingress port and packet contents. Packets sharing
common attributes can be grouped in the same VLAN.
You can use VLANs to:
• Increase network performance
• Increase internal network security
• Create separate broadcast domains
If the network has adequate performance and security for your current
needs, it is recommended that you leave the VLAN settings in the default
conguration. The default conguration is as follows:
• All ports are members of VLAN 1
• The switch management interface is on VLAN 1 (this cannot be changed)
• All ports have a Port VLAN ID (PVID) of 1
• All ports can send and receive both VLAN-tagged and untagged
packets (i.e. they are “hybrid” ports)
In the default conguration, any port is able to send trafc to any other
port and a PC connected to any port will be able to reach the
management interface. Broadcast trafc, for example, will be ooded to all
ports on the switch.
VLAN page lets you to congure VLANs per port. The switch can be
congured as either VLAN unaware, behaving transparently toward
VLAN- tagged frames, or as VLAN aware, where VLAN information is
used in the forwarding decision. The switch can maintain 16 VLANs.
For a VLAN-aware (enabled) switch, untagged frames are classied to a
port specic, congurable VLAN identier (PVID). Frames that already
have a VLAN tag when they are received, they will be classied to the VID
within the tag header in the frame.
VLAN-awareness (tagging or untagging frames) can be congured on a
per-port basis. Each port can be congured to a set of ports to which it
can forward and thereby facilitate port-based VLANs. By defaults, all ports
can forward to all other ports .
Packet type
PCs should be connected to ports with Packet Type set to All. PCs cannot,
in general, send or receive tagged packets. Switches should be connected
to each other with Packet Type set to Tagged.
If the Packet Type is set to All, the port can accept incoming tagged and
untagged packets. Untagged packets will be associated with the VLAN
identied by the PVID. Tagged packets will be dropped unless the port is a
member of the VLAN identied by the VLAN tag in the packet. Outgoing
packets will be tagged unless the packet’s VLAN ID is the same as the PVID.
If the Packet Type is set to Tagged, the port will drop untagged packets and
will only send and receive tagged packets. Tagged packets will be dropped
unless the port is a member of the VLAN identied by the VLAN tag in the
packet. The PVID has no effect in this case.