Moxa Technologies EDS-508 user manual Sample Applications of VLANs using Moxa EtherDevice Switch

EDS-508 Series User’s Manual Featured Functions

tagged with a VLAN identifier so that the Switches can identify which packets belong in which VLANs. To communicate between VLANs a router must be used.

MOXA EtherDevice Switch supports two types of VLAN port setting for your convenient setting about tagged and untagged configurations.

#Access Port: The port connects to a single device that is not tagged. The user must define the default port PVID that assigns which VLAN the device belongs to. Once the ingress packet of this Access Port will egress to another Trunk Port (the port needs all packets to carry tag information), EDS will insert this PVID into this packet to help the next 802.1Q VLAN switch recognize it.

#Trunk Port: The port connects to a LAN that consists of untagged devices/tagged devices and/or switches and hubs. In general, the traffic of the Trunk Port must have a Tag. Users can also assign PVID to a Trunk Port. The untagged packet on the Trunk Port will be assigning the port default PVID as its VID.

The following section illustrates how to use these ports to set different applications.

Sample Applications of VLANs using MOXA EtherDevice Switch

						Device I
Device A	Switch A	Switch B	Port 7 (Access Port		VLAN 4 Untagged Device
VLAN 5 Untagged Device			PVID 4
		Port 3 (Trunk Port, PVID 1)	Port 5 (Access Port			Device H
Port1: (Access Port			PVID 3		VLAN 3 Untagged Device
PVID 5)	Port 2 (Trunk Port
	PVID 2,
	Fixed VLAN (Tagged)=3,4)Port 4 (Access Port
				Port 6 (Access Port PVID 5)
		PVID 2)

	HUB
	Device F
Device B	VLAN 2 Untagged Device
VLAN 2 Untagged Device	Device E
	VLAN 4 Tagged Device, VID 4

Device C Device D

Device G

VLAN 5 Untagged Device

VLAN 2 Untagged Device

VLAN 3 Tagged Device, VID 3

In this application,

#Port 1 connects a single untagged device and assigns it to VLAN 5; it should be configured as “Access Port” with PVID 5.

#Port 2 connects a LAN with two untagged devices belonging to VLAN 2. One tagged device with VID 3 and one tagged device with VID 4. It should be configured as “Trunk Port” with PVID 2 for untagged device and Fixed VLAN (Tagged) with 3 and 4 for tagged device.

Since each port can only have one unique PVID, all untagged devices on the same port can only belong to the same VLAN.

#Port 3 connects with another switch. It should be configured as “Trunk Port.” They will use GVRP protocol through the Trunk Port.

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