An information processing method, applicable to a network controller, the information processing method comprising: acquiring a first Border Gateway Protocol Link State, BGP-LS, message reported by a first edge node of a first network domain, the first BGP-LS message carrying second segment identifier information and first segment identifier information pre-configured according to the second segment identifier information, the first segment identifier information corresponding to the first edge node, and the second segment identifier information corresponding to a second edge node of the first network domain; wherein, the first segment identifier information pre-configured for the second segment identifier information is by means of a mapping relationship between the first segment identifier information and the second segment identifier information; determining, according to the first segment identifier information and the second segment identifier information, the presence of a reachable path from the first edge node to the second edge node; and calculating a routing path including the reachable path, and establishing a segment identifier list including the first segment identifier information in the process of calculating the routing path; characterized in that, the first BGP-LS message further carries Forwarding Equivalence Class, FEC, information; and, the determining, according to the first segment identifier information and the second segment identifier information, the presence of a reachable path from the first edge node to the second edge node comprises: determining, according to the first segment identifier information, the second segment identifier information and the FEC information, the presence of a reachable path from the first edge node to the second edge node; wherein, the FEC, information comprises loopback routing information of an exit node of MPLS label switching path or global IPv6 routing information of another exit node of SRv6 domain. acquiring a first Border Gateway Protocol Link State, BGP-LS, message reported by a first edge node of a first network domain, the first BGP-LS message carrying second segment identifier information and first segment identifier information pre-configured according to the second segment identifier information, the first segment identifier information corresponding to the first edge node, and the second segment identifier information corresponding to a second edge node of the first network domain; wherein, the first segment identifier information pre-configured for the second segment identifier information is by means of a mapping relationship between the first segment identifier information and the second segment identifier information; determining, according to the first segment identifier information and the second segment identifier information, the presence of a reachable path from the first edge node to the second edge node; and calculating a routing path including the reachable path, and establishing a segment identifier list including the first segment identifier information in the process of calculating the routing path; characterized in that, the first BGP-LS message further carries Forwarding Equivalence Class, FEC, information; and, the determining, according to the first segment identifier information and the second segment identifier information, the presence of a reachable path from the first edge node to the second edge node comprises: determining, according to the first segment identifier information, the second segment identifier information and the FEC information, the presence of a reachable path from the first edge node to the second edge node; wherein, the FEC, information comprises loopback routing information of an exit node of MPLS label switching path or global IPv6 routing information of another exit node of SRv6 domain. determining, according to the first segment identifier information, the second segment identifier information and the FEC information, the presence of a reachable path from the first edge node to the second edge node; wherein, the FEC, information comprises loopback routing information of an exit node of MPLS label switching path or global IPv6 routing information of another exit node of SRv6 domain.