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VLAN Tagging (IEEE 802.1Q)

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Revision as of 14:43, 13 September 2019 by Roarl (talk | contribs)
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VLAN Tagging is the practice of inserting a VLAN ID into a packet header in order to identify which VLAN (Virtual Local Area Network) the packet belongs to. More specifically, switches use the VLAN ID to determine which port(s), or interface(s), to send a broadcast packet to.

VLAN tagging is supported by stations in the INCA family.

User interface:
VLAN is configured in the IP station web interface.

IP-StationWeb VLAN.PNG


Clicking the Apply settings button will apply the chosen settings. With the exception of a restart, the saved settings will not come into effect until Apply settings is clicked.


Enable VLAN:
This option determines whether the switch uses 802.1Q or not. If this is enabled, the switch is VLAN aware. Select YES or NO from the dropdown menu.


Port specific VLAN rules and tagging options:
Here, it is possible to specify which VLAN ID and priority the ports should assign untagged packets to. Tagged packets are not changed.

  • VLAN ID has a value range from 0 to 4094. It specifies which VLAN ID tag to add to a packet.
  • VLAN priority has a value range from 0 to 7. It specifies which VLAN priority tag to add to a packet.
  • Sending filter specifies 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 1 at the LAN port

will only reach another port which is a member of VLAN ID 1. Select MEMBERS or ALL from the dropdown menu.

  • Acceptance filter specifies 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. Select ONLY

TAGGED or ALL from the dropdown menu.

  • If the IP-station upgrade with VLAN scrolldown box is set to YES the IP station will send tagged packets during the upgrade.


VLAN priority tag to switch priority:
Here, it is possible to specify how the switch should queue the packets with VLAN priority tag.

  • Switch priority: Select HIGH or LOW from the dropdown menu. By default, packets with VLAN priority tags from 4 to 7 are set to the HIGH priority queue.

See also IP Station on VLAN with Cisco Catalyst PoE swtich


Add ports to a VLAN:
Here, it is possible to determine whether the ports should be members of the specified VLAN. There is also a setting for specifying whether the ports should strip or keep the VLAN tag when sending egress packets.

  • Membership determines whether the port is a member of the specified VLAN or not. Select Not member or Member from the dropdown menu.
  • Egress tagging determines whether the port should remove VLAN tags or keep them for the specified VLAN. Select Remove tag or Keep tag from the dropdown menu.

Clicking the Add VLAN button will add the current chosen settings to the VLAN table below. If a VLAN in the VLAN table already exists with the chosen VLAN ID, then the settings will be updated.


Remove VLAN by ID:
Here, it is possible to determine which VLAN is to be removed from the VLAN table by specifying the VLAN ID, then clicking the Remove VLAN button.


VLAN table:
The VLANs that the ports are members of are listed under the Membership Info column. The table also lists the ports that keep the VLAN tag when sending egress packets; this is shown under the Egress Tagging Info column. The VLAN table can accommodate a maximum of 63 VLANs.

The DHCP address is received before the switch is VLAN aware (during startup).
Either trunk all VLANs or set the DHCP server which should reach the IP substation
on a native VLAN.


Related Articles

IP Station on VLAN with Cisco Catalyst PoE swtich