| 摘要 |
A method and device for long-term storage of cross-domain path information are provided. The method is applied on a stateless PCE. In the method, a first PCE computes a path; a path head node sends, to the first PCE, query information for querying intra-domain path information of the first domain corresponding to a first PATH-KEY, generates, on the basis of a query result returned by the first PCE, a third PATH-KEY having a unique identifier and corresponding to the intra-domain path information of the first domain and stores the third PATH-KEY; the path head node sends, to a head node in a second domain, an inter-domain path establishment signalling comprising the third PATH-KEY and a second PATH-KEY, to make the head node in the second domain send, to a second PCE, query information for querying intra-domain path information of the second domain corresponding to the second PATH-KEY, generate, on the basis of a query result returned by the second PCE, a fourth PATH-KEY having a unique identifier and corresponding to the intra-domain path information of the second domain, and store the fourth PATH-KEY; and, the path head node modifies information of the path from the path head node to the path tail node on the basis of a reverse signalling returned by the path tail node and comprising the third PATH-KEY and the fourth PATH-KEY. |
| 主权项 |
1. A method for long-term storage of cross-domain path information, wherein the method is applied on a stateless path computation element (PCE) and comprises:
sending, by a path head node, path request information comprising the path head node and a path tail node to a second PCE corresponding to a second domain where the path tail node is located via a first PCE corresponding to a first domain, to enable the first PCE to compute an intra-domain path of the first domain and generate a first PATH-KEY corresponding to the intra-domain path of the first domain, compute a path from the path head node to the path tail node according to path response information returned by the second PCE and comprising a second PATH-KEY corresponding to an intra-domain path of the second domain, and send information of the path from the path head node to the path tail node to the path head node; sending, by the path head node to the first PCE, query information for querying intra-domain path information of the first domain corresponding to the first PATH-KEY, generating, according to a query result returned by the first PCE, a third PATH-KEY having a unique identifier and corresponding to the intra-domain path information of the first domain, and storing the third PATH-KEY; sending, by the path head node, to a head node in the second domain an inter-domain path establishment signalling comprising the third PATH-KEY and the second PATH-KEY, to enable the head node in the second domain to send, to the second PCE, query information for querying intra-domain path information of the second domain corresponding to the second PATH-KEY, generate, according to a query result returned by the second PCE, a fourth PATH-KEY having a unique identifier and corresponding to the intra-domain path information of the second domain, and store the fourth PATH-KEY; and modifying, by the path head node, the information of the path from the path head node to the path tail node according to a reverse signalling returned by the path tail node and comprising the third PATH-KEY and the fourth PATH-KEY. |
