SMC Networks SMCGS24C-Smart manual Field Attributes

WEB CONFIGURATION

In the default configuration, any port is able to send traffic to any other port and a PC connected to any port will be able to access the management interface. Broadcast traffic, for example, will be flooded to all ports on the switch.

There are three different parameters that can be configured for each port on the switch; VLAN ID (VLAN membership), PVID and Packet Type. Note that the ports within a trunk cannot be configured individually; configure the trunk instead (trunks are labelled T1 to T8).

IEEE 802.1Q Tunneling (QinQ) is designed for service providers carrying traffic for multiple customers across their networks. QinQ tunneling is used to maintain customer-specific VLAN configurations even when different customers use the same internal VLAN IDs. This is accomplished by inserting Service Provider VLAN (SPVLAN) tags into the customer’s frames when they enter the service provider’s network, and then stripping the tags when the frames leave the network. QinQ tunneling expands VLAN space by using this VLAN-in-VLAN hierarchy, preserving the customer’s original tagged packets, and adding SPVLAN tags to each frame (also called double tagging). Ports on the switch can be set to support QinQ when providing a direct link to a service provider's network.

Field Attributes

•Port/Trunk – The port-number of the port or the ID of a trunk. This cannot be changed.

•VLAN Awareness – VLAN aware ports will strip the VLAN tag from received frames and insert the tag in transmitted frames (except PVID). VLAN unaware ports will not strip the tag from received frames or insert the tag in transmitted frames.

For QinQ operation, a customer port should be set to VLAN unaware and a provider port (trunk port) should be set to VLAN aware.

•QinQ – A QinQ enabled port will accept packets up to 1526 bytes in length, which means double tag header frames can be accepted.

QinQ should be enabled for provider ports but not for customer ports.

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