VLAN Tagging allows an individual port or interface on the IMG to be part of multiple VLANs. When configured, each outgoing packet is tagged before leaving the IMG 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. Feature F-5601 Support for VLAN allows a user the choice of whether or not packets leaving the IMG have a VLAN ID tag inserted in its header. Through the GCEMS application the user can specify the VLAN 16 bit Tag Control Information (TCI) that will be assigned to either each individual interface (CTRL/SIG/DATA) or each individual IP address. All packets leaving either the specific interface or with a specific IP address will have a VLAN tag with the TCI information inserted in the ethernet header. Refer to the information below and the topics in the Related Items section below for more information on this feature.
In the diagram above the DATA interface is configured for VLAN Tagging. The configuration below describes the configuration needed to accomplish the diagram above. From diagram above, packets leaving the Data interface are tagged with a VLAN Identifier and sent to the router. The router reads the VLAN ID and routes the packets to the correct VLAN.
The configuration below will configure a VLAN Tag of 123 on any packets leaving the Data interface with an IP address of 10.129.39.88 and a VLAN Tag of 314 on any packets leaving the SIG interface with IP address of 10.129.40.100. The procedure below assumes the Logical IMG object and Physical IMG object have already been configured.
Note: The default value of the VLAN field is set to 0 which identifies the VLAN tagging as disabled.
Right click on the IP Network object again and select New IP Address. Modify the CPU - Data object so the Data interface is used again but the CPU is now in the Physical Interface field. The VLAN ID for this is ID:314 and the priority is 3. See screen capture below
The VLAN tag configuration for the diagram is now complete. This procedure can be used on any interface/ip address to add a VLAN Tag to the ethernet packets leaving the interface using a specific IP address.
When the VLAN tag is configured on the IMG, 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 ClientView application 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.
VLAN ID's cannot be shared across interfaces. For example, a VLAN ID of (2) cannot be configured on both the Data and Signaling interface.
VLAN ID's can be shared on the same interface. For example, multiple IP addresses can be configured on the Data Interface and they can all have the same VLAN ID.
A VLAN ID of 0 identifies the VLAN tagging functionality as disabled.
When configuring the Logical Interface object (IP Network -> Logical Interface), the VLAN Tag field is not selectable when Control is selected as the interface. Doing so could create a situation where GCEMS loses communication with the IMG. However, configuring a VLAN tag on the individual Control Interface when configuring the IP Address object (IP Network -> IP Address) in ClientView is allowed.