Link state detection method and system

A link state detection method, comprising:

• detecting, by a traffic manager egress (TME), a state of a link from the TME to a lowest level switching element (SE) of a SE, and sending corresponding first link state information to the lowest level SE;
• obtaining, by the lowest level SE, first accessibility information from a first level SE to the lowest level SE and obtaining second accessibility information from the first level SE to the TME according to the first link state information sent by the TME and the first accessibility information;
• detecting and obtaining, by the first level SE, second link state information from the first level SE to a traffic manager ingress (TMI);
• sending to the TMI, by the first level SE, the second accessibility information and the second link state information;
• and
• obtaining, by the TMI, third accessibility information from the TMI to the TME, according to the second accessibility information and the second link state information sent by the first level SE.

A link state detection system, comprising:

• a traffic manager egress (TME), configured to obtain first link state information from the TME to a switching element (SE);
• wherein the SE is configured to receive the first link state information from the TME, acquire first accessibility information from the SE to the TME according to the received first link state information, and obtain second link state information from the SE to a traffic manager ingress (TMI);
• wherein the TMI is configured to receive the first accessibility information from the SE and the second link state information from the SE, and acquire second accessibility information from the TMI to the TME based on the received first accessibility information and the received second link state information;
• wherein the SE comprises a lowest level SE configured to acquire the first accessibility information from the lowest level SE to the TME according to the first link state information sent by the TME, acquire third link state information from the lowest level SE to a mid-level SE, and transmit the first accessibility information and the third link state information to the mid-level SE;
• wherein the mid-level SE is configured to obtain third accessibility information from the mid-level SE to the TME according to the received first accessibility information and received third link state information sent by the lowest level SE, acquire fourth link state information from the mid-level SE to a first level SE, and transmit the third accessibility information and the fourth link state information SE to the first level SE;
• and
• wherein the first level SE is configured to obtain fourth accessibility information from the first level SE to the TME according to the third accessibility information and fourth link state information sent by the mid-level SE, acquire fifth link state information from the first level SE to the TMI, and transmit the fourth accessibility information and the fifth link state information to the TMI.

A switching element (SE), comprising:

• a lowest level SE configured to acquire first accessibility information from the lowest level SE to a traffic manager egress (TME) according to first link state information sent by the TME, acquire second link state information from the lowest level SE to a mid-level SE, and transmit the first accessibility information and the second link state information to the mid-level SE;
• wherein the mid-level SE is configured to obtain second accessibility information from the mid-level SE to the TME according to the received first accessibility information and received second link state information sent by the lowest level SE, acquire third link state information from the mid-level SE to a first level SE, and transmit the second accessibility information and the third link state information to the first level SE;
• and
• wherein the first level SE is configured to obtain third accessibility information from the first level SE to the TME according to the received second accessibility information and received third link state information sent by the mid-level SE, acquire fourth link state information from the first level SE to a traffic manager ingress (TMI), and transmit the third accessibility information and the fourth link state information to the TMI.