US 11,991,023 B2
Path construction method and related device
Detao Zhao, Shenzhen (CN); and Shaofu Peng, Shenzhen (CN)
Assigned to ZTE CORPORATION, Shenzhen (CN)
Appl. No. 17/297,332
Filed by ZTE Corporation, Shenzhen (CN)
PCT Filed Aug. 30, 2019, PCT No. PCT/CN2019/103466
§ 371(c)(1), (2) Date May 26, 2021,
PCT Pub. No. WO2020/107977, PCT Pub. Date Jun. 4, 2020.
Claims priority of application No. 201811426164.5 (CN), filed on Nov. 27, 2018.
Prior Publication US 2022/0014394 A1, Jan. 13, 2022
Int. Cl. H04L 12/46 (2006.01); H04L 45/02 (2022.01); H04L 45/50 (2022.01)
CPC H04L 12/4641 (2013.01) [H04L 45/04 (2013.01); H04L 45/50 (2013.01)] 19 Claims
OG exemplary drawing
 
19. A system for constructing a transmission path, comprising:
a second Provider Edge (PE) node, which is configured to advertise a first Virtual Private Network (VPN) route to a first PE node through an Multiprotocol Border Gateway Protocol (MP-BGP) signaling channel; and
the first PE node, which is configured to determine a label forwarding path to a first VPN Prefix based on a first transmission path descriptor (TPD) carried in the first VPN route received;
wherein the first TPD is configured to identify the label forwarding path for a first VPN message to reach a BGP next hop;
an Area Border Router (ABR);
wherein the second PE node is further configured to advertise a first Border Gateway Protocol Labeled Unicast (BGP-LU) route to the first PE node by the ABR through the MP-BGP signaling channel;
wherein the first PE node is further configured to create a first Forwarding Equivalence Class to Next Hop Label Forwarding Entry map (FTN) forwarding entry corresponding to a first Forwarding Equivalence Class (FEC) based on the first BGP-LU route received, and the first FTN forwarding entry is associated with a label forwarding path of the first VPN message identified by the first TPD to BGP next hop;
wherein the first BGP-LU route carries the first TPD and a label corresponding to the first FEC, and the first FEC consists of the first TPD and a first prefix configured by the second PE node for the first BGP-LU route; and
wherein the TPD is in a format of TLV comprising TPD Type and Sub-TLV, the TPD Type is configured to identify which Sub-TLVs constitute the TPD, and the Sub-TLV comprises one or more Sub-TLVs constituting the TPD.