Link state detection method and system

A link state detection method, comprising:

• detecting, by a TME, state of the link from the TME to a lowest level SE of a SE, and sending corresponding link state information to the SE;
• obtaining, by the SE, accessibility information from a first level SE to a lowest level of the SE, and obtaining accessibility information from a first level SE of the SE to the TME according to the link state information sent by the TME and accessibility information from the first level SE to the lowest level SE;
• detecting and obtaining, by the first level SE, link state information from the first level SE to a TMI;
• sending, by the first level SE, the accessibility information from the first level SE to the TME and the link state information from the first level SE to the TMI to the TMI;
• and
• obtaining, by the TMI, accessibility information from the TMI to the TME, according to the accessibility information and the link state information sent by the first level SE.

A link state detection system, comprising:

• a TME, configured to obtain link state information from the TME to an SE;
• the SE, configured to receive the link state information from the TME to the SE, obtain the link state information in the SE, acquire the accessibility information from the SE to the TME according to the link state information from the TME to the SE, and obtain the link state information from the SE to a TMI;
• and
• the TMI, configured to receive the accessibility information from the SE to the TME and the link state information from the SE to the TMI, and acquire the accessibility information from the TMI to the TME based on the accessibility information from the SE to the TME and the link state information from the SE to the TMI.

A switching element (SE), comprising:

• a lowest level SE, configured to acquire the accessibility information from the lowest level SE to the TME according to link state information sent by the TME, acquire link state information from the lowest level SE to a mid-level SE, and transmit the accessibility information from the lowest level SE to the TME and the link state information from the lowest level SE to the mid-level SE to the mid-level SE;
• the mid-level SE, configured to obtain accessibility information from the mid-level SE to the TME according to the accessibility information and link state information sent by the lowest level SE, acquire link state information from the mid-level SE to a first level SE, and transmit the accessibility information from the mid-level SE to the TME and the link state information from the mid-level SE to the first level SE to the first level SE;
• and
• a first level SE, configured to obtain accessibility information from the first level SE to the TME according to the accessibility information and link state information sent by the mid-level SE, acquire link state information from the first level SE to the TMI, and transmit the accessibility information from the first level SE to the TME and the link state information from the first level SE to the TMI to the TMI.

A traffic manager egress (TME), comprising:

• a receiving module, configured to receive the data that is sent by a lowest level SE;
• a detecting module, configured to detect the link state information from the lowest level SE to the receiving module;
• and
• a notifying module, configured to notify the link state information, which is detected by the detecting module to the lowest level SE.