Method and system for automatically discovering ODUflex bandwith lossless adjustment capability

1. A method for automatically discovering a flexible rate Optical Data Unit (ODUflex) bandwidth hitless resizing capability, comprising: a source end interface of a link sending a link summary message to an opposite end interface of the link, wherein the link summary message carries information of whether the source end interface of the link supports the ODUflex bandwidth hitless resizing capability which is defined through a G.hao protocol; after receiving the link summary message, the opposite end interface of the link firstly determining whether a local interface mapping relationship or a remote end interface mapping relationship carried in the message is matched with an interface mapping relationship stored in the opposite end interface, if matched, feeding back a message to the source end interface of the link according to said information or according to said information and whether the opposite end interface of the link supports the ODUflex bandwidth hitless resizing capability, if the local interface mapping relationship or the remote end interface mapping relationship carried in the message is mismatched with the interface mapping relationship stored in the opposite end interface, the opposite end interface sending a link summary not-acknowledgment message to the source end interface of the link and indicating that the interface mapping relationships are mismatched; and the source end interface of the link determining whether the link supports the ODUflex bandwidth hitless resizing capability according to the message fed back by the opposite end interface of the link; wherein the link summary message carrying the information of whether the source end interface of the link supports the ODUflex bandwidth hitless resizing capability is implemented by a following way: a data link object of the link summary message including a subobject, and the subobject including a field which represents whether the source end interface supports the ODUflex bandwidth hitless resizing capability; wherein: the step of, after receiving the link summary message, the opposite end interface of the link feeding back the message to the source end interface of the link according to said information or according to said information and whether the opposite end interface of the link supports the ODUflex bandwidth hitless resizing capability comprises: after receiving the link summary message, the opposite end interface of the link reading the field in the subobject, making a judgment on the field, if judging that the field represents that the source end interface does not support the ODUflex bandwidth hitless resizing capability, feeding back a link summary not-acknowledgment message to the source end interface of the link; if judging that the field represents that the source end interface supports the ODUflex bandwidth hitless resizing capability, then judging whether the opposite end interface of the link supports the ODUflex bandwidth hitless resizing capability, if not supporting, feeding back the link summary not-acknowledgment message to the source end interface of the link, and if supporting, feeding back a link summary acknowledgment message to the source end interface of the link.

2. The method according to claim 1 , wherein: the link summary not-acknowledgment message includes an object used for describing error causes.

3. The method according to claim 2 , wherein: the object used for describing the error causes includes information used for indicating that the error causes are unacceptable non-negotiable link summary parameters.

4. The method according to claim 2 , wherein: the opposite end interface of the link reading the field in the subobject is performed in a condition that a local interface mapping relationship or a remote end interface mapping relationship carried in the link summary message is matched with an interface mapping relationship stored in the opposite end.

5. The method according to claim 1 , wherein: the step of the source end interface of the link sending the link summary message to the opposite end interface of the link is: the source end interface of the link periodically sending the link summary message to the opposite end interface of the link through a link management protocol.

6. A system for automatically discovering a flexible rate Optical Data Unit (ODUflex) bandwidth hitless resizing capability, comprising: a node in which a source end interface of a link is located, comprising a hardware processor and being configured to send a link summary message to a node in which an opposite end interface of the link is located, wherein the link summary message carries information of whether the source end interface of the link supports the ODUflex bandwidth hitless resizing capability which is defined through a G.hao protocol; and configured to determine whether the link supports the ODUflex bandwidth hitless resizing capability according to a message fed back by the node in which the opposite end interface of the link is located; and the node in which the opposite end interface of the link is located, comprising a hardware processor and being configured to: after receiving the link summary message, firstly determine whether a local interface mapping relationship or a remote end interface mapping relationship carried in the message is matched with an interface mapping relationship stored in the opposite end interface, if matched, feed back the message to the node in which the source end interface of the link is located according to said information or according to said information and whether the opposite end interface of the link supports the ODUflex bandwidth hitless resizing capability, if the local interface mapping relationship or the remote end interface mapping relationship carried in the message is mismatched with the interface mapping relationship stored in the opposite end interface, send a link summary not-acknowledgment message to the source end interface of the link and indicate that the interface mapping relationships are mismatched; wherein the link summary message carrying the information of whether the source end interface of the link supports the ODUflex bandwidth hitless resizing capability is implemented by a following way: a data link object of the link summary message including a subobject, and the subobject including a field which represents whether the source end interface supports the ODUflex bandwidth hitless resizing capability; wherein: the node in which the opposite end interface of the link is located comprises a storage device storing processor executable instructions that when executed by the processor cause the processor to perform the steps in the following modules: a reading module, configured to: after receiving the link summary message, read the field in the subobject; a first judgment module, configured to: judge whether the field represents that the source end interface supports the ODUflex bandwidth hitless resizing capability; a second judgment module, configured to: if the first judgment module judges that the field represents that the source end interface supports the ODUflex bandwidth hitless resizing capability, judge whether the opposite end interface of the link supports the ODUflex bandwidth hitless resizing capability; a first sending module, configured to: if the first judgment module judges that the field represents that the source end interface does not support the ODUflex bandwidth hitless resizing capability or the second judgment module judges that the opposite end interface of the link does not support the ODUflex bandwidth hitless resizing capability, feed back a link summary not-acknowledgment message to the node in which the source end interface of the link is located; and a second sending module, configured to: if the second judgment module judges that the opposite end interface supports the ODUflex bandwidth hitless resizing capability, feed back a link summary acknowledgment message to the node in which the source end interface of the link is located.

7. The system according to claim 6 , wherein: the link summary not-acknowledgment includes an object used for describing error causes, and the object used for describing the error causes includes information used for indicating that the error causes are unacceptable non-negotiable link summary parameters.

8. The system according to claim 7 , wherein: the reading module comprises a matching unit and a reading unit: a matching unit is configured to: after receiving the link summary message, perform matching between a local interface mapping relationship or a remote end interface mapping relationship carried in the link summary message and an interface mapping relationship stored in the opposite end, and if the matching is consistent, trigger the reading unit; the reading unit is configured to: after being triggered, read the field in the subobject.