VLAN Tagging (IEEE 802.1Q)

IEEE 802.1Q, or VLAN Tagging, is a networking standard written by the IEEE 802.1 workgroup allowing multiple bridged networks to transparently share the same physical network link without leakage of information between networks. IEEE 802.1Q — along with its shortened form dot1q — is commonly used to refer to the encapsulation protocol used to implement this mechanism over Ethernet networks.

STENTOFON IP Stations support 802.1Q as from firmware version 01.09.

User interface

The VLAN interface can be found in the IP-station web interface at Advanced --> VLAN

• The button “Apply switch settings” will apply the chosen settings. The saved settings are not used until this button is pushed, except in the case of a restart.

• Enable VLAN – Decides whether the switch use 802.1Q or not. If enabled then the switch is VLAN aware.

• In table “Port specific VLAN rules and tagging options” it is possible to decide which VLAN ID and priority the ports should assign untagged packets. Tagged packets are not changed.
  • The setting “VLAN ID” has a value range from 0-4094. It decides which VLAN ID tag to add to a packet.
  • The setting “Priority” has a value range from 0-7. It decides which VLAN priority tag to add to a packet.
  • The setting “Sending filter” decides whether a given port will only send to VLANs which it is a member of or all VLANs. For example if the chosen option is “MEMBERS” then a packet with VLAN ID 2 at the LAN port will only reach another port which is member of VLAN ID 2.
  • The setting “Acceptance filter” decides whether a port will accept only tagged packets or all packets. The option “ONLY TAGGED” should only be used against VLAN aware devices which tag packets.

• In table “VLAN priority tag to switch priority” it is possible to decide how the switch shoule queue the packets with VLAN priority tag. The switch got 2 priority queues: HIGH and LOW. By default packets with VLAN priority tags from 4-7 are in the HIGH priority queue.

• In table "Add ports to a VLAN" it is possible to choose if the ports should be members of the specified VLAN. A setting is also given to choose whether the ports should strip the VLAN tag or keep it when sending egress packets.
  • The setting “Membership” decides whether the port is member of the specified VLAN or not
  • The setting “Egress tagging” decides whether the port should remove VLAN tags or keep them for the specified VLAN.

• The button “Add VLAN” will add the current chosen settings to the “VLAN table”. If a VLAN in the “VLAN table” already exists with the chosen VLAN ID then the settings will be updated.

• In the table "Remove VLAN by ID" it is possible to choose which VLAN that should be removed from the “VLAN table” by specifying the VLAN ID, then clicking the button "Remove VLAN"

• The “VLAN table” lists the VLANs the ports are member of in the “Membership Info” column. The table also lists the ports which keep the VLAN tag when sending egress packets; this is shown in the “Egress Tagging Info” column. The VLAN table can max include 63 VLANs.