63 MPH200 series video encoders WebUI user manual
Ingress VLAN classication
The switch always classies incoming frames to a VLAN. In the VLAN-
unaware mode, this classication does not inuence the forwarding of the
frame, whereas in the VLAN-aware mode, then classication is used to
make forwarding decisions. If VLAN tags are available in a frame, the
VLAN classication is always based on the outer tag in the frame.
Egress VLAN handling
The switch egress port decides which frames to transmit tagged and which
frames to transmit untagged. The following shows how the tagging or
untagging is performed at the egress port:
Do not tag frames: This applies when switch is running as VLAN-unaware
mode or when the port is VLAN-aware but congured as an access port.
Tag all frames: This applies when the port is congured as a trunk port.
Tag all frames except those with a specic VID: This applies when the
port congured as hybrid port, frames with a specic VID won’t be tagged.
VLAN IDs
VLAN ID number can be any number from 2 to 3290, or from 3293 to 4094.
(VLAN ID 1 is reserved for the default VLAN, which is used for untagged
frames received on the interface. VLAN IDs 3291...3292 are reserved and
cannot be used.) To create a VLAN, enter the ID number and click Add VLAN.
• VLAN 1 is a special VLAN; it cannot be deleted and, if there is a
possibility that a port could become isolated, the Web User Interface
will add the port to VLAN 1.
• You can add up to 16 VLANs to the conguration of the switch. Each
VLAN must be given a VLAN ID in the range 1...4094.
• A port can be a member of up to 16 VLANs.
• All packets travelling through the switch are associated with one and
only one VLAN.
• If a port is not a member of a VLAN, it cannot send or receive packets
associated with that VLAN.
• A tagged packet carries its VLAN ID in the payload of the packet.
• An untagged packet, received on a port with Packet Type set to All, is
associated with the VLAN identied by the PVID.
Port VLAN ID – PVID
PVID is the VLAN ID that is associated with untagged, ingress packets.
It is not possible to remove a port from VLAN 1 unless its PVID has been
changed to something other than 1.
Outgoing packets are tagged unless the packet’s VLAN ID is the same as
the PVID. When the PVID is set to “None,” all outgoing pacekts are tagged
(trunk port).
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