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VLAN Tagging

VLAN Tagging allows an individual IP Address to be configured as part of multiple VLANs. When configured, each outgoing packet is tagged with a VLAN ID tag compliant to IEEE 802.1Q VLAN specifications. The VLAN Aware Ethernet Switch or router extracts the tag and routes the packet into the correct VLAN Group. VLAN Tagging allows a user the choice of whether or not packets leaving the IMG 2020 will have a VLAN ID tag inserted in its header. Through the Web GUI application a user can specify the VLAN 16 bit Tag Control Information (TCI) that will be assigned to a Services IP Address, a Media 0 IP Address, or a Media 1 IP Address. All packets leaving the IMG 2020 with a specific IP address can have a VLAN tag with the TCI information inserted in its ethernet header. Refer to information below for more information on this feature.

Diagram

 In the diagram above, any of the interfaces CTRL, DATA A, or DATA B can be configured to pass IP packets that have a VLAN tag configured on them. The Configuration section below describes the steps required to accomplish VLAN tagging on a IP Address configured as a Services IP Address and an IP Address configured with a Media IP Address. From diagram above, packets leaving any configured interface with a specific IP address are tagged with a VLAN Identifier and sent to a VLAN Aware Ethernet Switch or Router. The Ethernet Switch/Router reads the VLAN ID and routes the packets to the correct VLAN.

Configuration

The first section below describes how to configure a VLAN Tag of 123 on any IP packets leaving the IMG 2020 with a Services IP address of 10.129.39.88. The second section describes configuring a VLAN Tag of 314 on any IP packets leaving the IMG 2020 with a Media 0 IP address of 10.129.39.89. Once configured, any packet leaving the IMG 2020 with one of the two IP addresses will have a VLAN tag added. The procedure below configures the specific IP Address and not the interface. The interface is configured in the Logical Interface object which is the parent object to the IP Address object being configured with the VLAN information. The procedure below assumes the Physical Node - Direct Connect object has already been configured.

VLAN Tag added to the packets transmitted out the Control Interface with a specific Services IP address

  • Right click on the IMG 2020 Node object and select New Network. The IP Network object that gets created is a container object and no configuration is needed here. Refer to IP Network Interface topic for more information on this object.

  • Right click on the IP Network object just created and select New Logical Interfaces. The Logical Interface is also a parent or container object and no configuration is needed here. Refer to the Logical Interfaces topic for more information on this object.

  • Right click on the Logical Interface object and select New Logical Interface. In the Interface field, select from the drop down menu which interface on the rear of the IMG 2020 will be utilized. In this procedure, Services was selected. Refer to the Logical Interface topic for more information on this object.

  • Right click on the Logical Interface object created and select New IP Address. In the Source Endpoint field, select Services from the drop down menu. This will configure the VLAN information on an IP address that will be used as a Services IP Address. Refer to the information below.

Individual Field Settings

  • Enter IP address and Default Gateway IP address.

  • If VLAN tagging is going to be utilized, select Enabled from the drop down menu of the VLAN field. This enables the VLAN functionality.

  • Enter a VLAN Tag into the VLAN ID field. In this example, 123 was entered.

  • In the VLAN Priority field, select a priority to be given to the VLAN ID. The priority given will indicate a priority level that will be given to the packet. A priority of 7 is highest and priority of 0 is the lowest. These values can be used to prioritize different classes of traffic (voice, video, data, etc).

  • Modify the ARP and ICMP to required settings. Refer to the topic for more information on configuring the individual fields.

Once the VLAN ID is configured and the IP Address object is committed, it cannot be modified. The only way to modify the VLAN ID is to delete and re-add the complete IP Address object.

  • The VLAN tag configuration for both then specific IP Address and Logical Interface object is now complete. This procedure can be used on any interface/ip address to add a VLAN Tag to any ethernet packets utilizing a specific IP address.
     

VLAN Tag added to the packets transmitted out the Data A Interface with a specific Media 0 IP address

  • Right click on the IMG 2020 Node object and select New Network. The IP Network object that gets created is a container object and no configuration is needed here. Refer to IP Network Interface topic for more information on this object.

  • Right click on the IP Network object just created and select New Logical Interfaces. The Logical Interface is also a parent or container object and no configuration is needed here. Refer to the Logical Interfaces topic for more information on this object.

  • Right click on the Logical Interface object and select New Logical Interface. In the Interface field, select from the drop down menu which interface on the rear of the IMG 2020 will be utilized. In this procedure, Data A was selected. Refer to the Logical Interface topic for more information on this object.

  • Right click on the Logical Interface object created and select New IP Address. In the Source Endpoint field, select Media 0 from the drop down menu. This will configure the VLAN information on an IP address that will be used as a Media 0 IP Address (rtp). Refer to the information below.

Individual Field Settings

  • Enter IP address and Default Gateway IP address.

  • If VLAN tagging is going to be utilized, select Enabled from the drop down menu of the VLAN field. This enables the VLAN functionality.

  • Enter a VLAN Tag into the VLAN ID field. In this example, 314 was entered.

  • In the VLAN Priority field, select a priority to be given to the VLAN ID. The priority given will indicate a priority level that will be given to the packet. A priority of 7 is highest and priority of 0 is the lowest. These values can be used to prioritize different classes of traffic (voice, video, data, etc).

  • The ARP field is automatically set to Enable and cannot be modified.

  • Modify the ICMP field to its required settings. Refer to the topic for more information on configuring the individual fields.

Once the VLAN ID is configured and the IP Address object is committed, it cannot be modified. The only way to modify the VLAN ID is to delete and re-add the complete IP Address object.

  • The VLAN tag configuration for both then specific IP Address and Logical Interface object is now complete. This procedure can be used on any interface/ip address to add a VLAN Tag to any ethernet packets utilizing a specific IP address.

Additional Information

  • A maximum of 20 VLANs can be created.

  • If an IP Address object is configured with an external VLAN Tag, all packets with the configured IP address will have the configured VLAN Tag inserted in the Ethernet header.

  • Refer to the screen capture below.

  • When the VLAN tag is configured on the IMG 2020, a VLAN Tag is inserted as shown in screen capture above. The tag is inserted between the Source Address and Ethernet Type information.

  • The Tag Protocol Identifier (TPID) is set to 0x8100 (default) in order to identify the frame as an IEEE 802.1Q tagged frame.

  • The priority of the tag is set through the Web GUI using the VLAN Priority field. The priority is set up through IEEE 802.1Q and is a way for administrators of a network to prioritize each packet being sent.

  • The Canonical Format Indicator (CFI) will always have a value of zero. Zero indicates data is going over ethernet.

  • VLAN ID is the ID configured in the VLAN ID field in the Web GUI application.

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