公开(公告)号：US20240031275A1

公开(公告)日：2024-01-25

申请号：US18091824

申请日：2022-12-30

Applicant: Cisco Technology, Inc.

Inventor： Alfred Clarence Lindem III ,  Peter Psenak ,  Lester C. Ginsberg

IPC: H04L45/122 ,  H04L45/00 ,  H04L45/02

CPC classification number: H04L45/122 ,  H04L45/20 ,  H04L45/02

Abstract: Techniques are described for providing a method and apparatus for determining source address validation of a data packet in a network in the presence of asymmetric routing. When a data packet is received by a node such as a router, a reverse path forwarding lookup is performed to determine if the data packet was received on a next-hop interface and if the reverse path forwarding fails, a Shortest Path First (SPF) computation at the router advertising the source route will be performed using the link state database to determine whether the data packet arrived from a valid path of the network.