Method, Device, and System for Packet Processing

A device for packet processing, comprising:

• a packet receiving unit, configured to receive a protocol packet from a downstream device, wherein the protocol packet carries uplink port information of the downstream device and user virtual local area network VLAN of the downstream device;
• a learning unit, configured to learn port types of the device based on the uplink port information, and classify the user VLAN of the device and the user VLAN of the downstream device based on the user VLAN of the downstream device;
• wherein classified VLAN types comprise a Local VLAN that is only used by users of the device, an Across VLAN that is not used by users of the device but used by users of the downstream device, and a Common VLAN that is used by both users of the device and users of the downstream device;
• and
• a packet processing unit, configured to forward the protocol packet received based on configuration information stored on the device, wherein the port type or types to which each VLAN type can be added are specified in the configuration information.

A system for packet processing, comprising a first device and a second device, wherein:

• the first device is configured to send a protocol packet to the second device, wherein the protocol packet carries uplink port information of the first device and user virtual local area network VLAN of the first device;
• and
• the second device is configured to learn port types of the second device based on the uplink port information, classify the user VLAN of the second device and the user VLAN of the first device based on the user VLAN of the first device, and forward the protocol packet received is based on configuration information stored on the second device, wherein the port type or types to which each VLAN type can be added are specified in the configuration information;
• wherein classified VLAN types comprise a Local VLAN that is only used by users of the second device, an Across VLAN that is not used by users of the second device but used by users of the first device, and a Common VLAN that is used by both users of the second device and users of the first device.