Method and device for long-term storage of information cross-domain route

摘要

A method for long-term storage of route information cross-domain, in which the method is applied to an element of route calculation stateless, PCE, and comprises: sending, by a head node routing information request path comprising the node route header and tail node route to a second PCE corresponding to a second domain where is located the tail node path by a first PCE corresponding to a first domain, to enable the first PCE calculate an intra-domain of the first domain route and generate a first route-KEY corresponding to the domain-intra the first domain, route calculate a route from the node header path to the node queue route according to route reply information returned by the second PCE, wherein a second rOUTE-KEY corresponding to an intra-domain route of the second domain is comprised in the routing information response, and send the information d and route header node of the route from the route header node to node route tail; sending, by the head node route to the first PCE, information query to query routing information intra-domain of the first domain corresponding to the first route-KEY, generate, according to a query result returned by the first PCE a third TRAIL-KEY has a unique identifier and corresponding to the route information intra-domain of the first domain, and storing the third TRAIL-KEY for a long term; sending, by the node route header, a head node in the second domain signaling route setting inter-domain comprising third TRAIL-KEY and the second route-KEY, to enable the head node in the second domain send, the second PCE, reference information to query routing information intra-domain of the second domain corresponding to the second rOUTE-KEY, generate, according to a query result returned by the second PCE, a fourth rOUTE -key you are having a unique identifier and corresponding to the information of intra-domain route of the second domain, and storing the fourth TRAIL-KEY for a long term; and modify the route header node, the route information from the route header node to node queue route according to a reverse signaling returned by the node queue and route comprising the third route- KEY and fourth-KEY ROUTE