Method, apparatus, and system for judging path congestion

An apparatus for determining path congestion, wherein the apparatus is located in an egress node in an Ethernet path, comprising:

• an Ethernet ingress port, configured to receive an Ethernet packet;
• a pre-congestion determining module, configured to determine whether pre-congestion occurs in the apparatus for determining path congestion after the Ethernet ingress port receives the Ethernet packet;
• a pre-congestion flag determining module, configured to determine whether an pre-congestion flag is carried in the Ethernet packet after the Ethernet ingress port receives the Ethernet packet;
• a pre-congestion status storage module, configured to store a pre-congestion status of the Ethernet path, the current pre-congestion status comprising a status that a pre-congestion occurs and a status that the pre-congestion does not occur;
• a pre-congestion status changing module, configured to query the pre-congestion status stored in the pre-congestion status storage module, determine whether to change the pre-congestion status based on the determination of the pre-congestion determining module and the determination of the pre-congestion flag determining module, and change the pre-congestion status;
• a pre-congestion status indication packet generating unit, configured to generate a pre-congestion status indication packet when the pre-congestion status changing module changes the pre-congestion status, wherein the pre-congestion status indication packet comprises a path identifier of the Ethernet path, wherein the path identifier is a virtual local area network identifier (VLAN ID);
• and
• an Ethernet egress port, configured to send the pre-congestion status indication packet to an ingress node or a policy server.

A non-transitory computer-readable medium having computer-executable instructions stored thereon which, when executed by a computer, cause the computer to determine path congestion of an Ethernet path, the computer-executable instructions comprising:

• instructions for receiving an Ethernet packet;
• instructions for determining whether an egress node changes a current pre-congestion status, wherein the current pre-congestion status comprises a status that a pre-congestion occurs and a status that the pre-congestion does not occur;
• instructions for generating a pre-congestion status indication packet when the current pre-congestion status is changed, wherein the pre-congestion status indication packet comprises a path identifier of the Ethernet path, wherein the path identifier is a virtual local area network identifier (VLAN ID);
• and
• instructions for sending the pre-congestion status indication packet to an ingress node or a policy server.

An apparatus for determining path congestion, wherein the apparatus is located in an egress node in an Ethernet path, comprising:

• an Ethernet ingress port, configured to receive an Ethernet packet;
• a pre-congestion determining module, configured to determine whether pre-congestion occurs in the apparatus for determining path congestion after the Ethernet ingress port receives the Ethernet packet;
• a pre-congestion status storage module, configured to store a pre-congestion status of the Ethernet path, the current pre-congestion status comprising a status that a pre-congestion occurs and a status that the pre-congestion does not occur;
• a pre-congestion status changing module, configured to query the pre-congestion status stored in the pre-congestion status storage module, determine whether to change the pre-congestion status based on the determination of the pre-congestion determining module, and change the pre-congestion status;
• a pre-congestion status indication packet generating unit, configured to generate a pre-congestion status indication packet when the pre-congestion status changing module changes the pre-congestion status, wherein the pre-congestion status indication packet comprises a path identifier of the Ethernet path, wherein the path identifier is a virtual local area network identifier (VLAN ID);
• and
• an Ethernet egress port, configured to send the pre-congestion status indication packet to an ingress node or a policy server.