Patent ID: 9667517
Date: 2017-05-30
CPC Classifications: H04L

Claim:
1. A method for checking connectivity between a first device and a second device on a bidirectional Label Switched Path (LSP), the method comprising: sending an echo request from the first device to the second device, the echo request including, receiving a first echo reply from the second device, if the first device is on a path of the backward LSP, the first echo reply including, receiving a second echo reply from an end device on the path of the backward LSP, if the first device is not on the path of the backward LSP, the end device receiving the echo request from the first device, the second echo reply including a modified version of the return code in the first echo reply; and correlating the received first echo reply or the received second echo reply with the echo request at the first device to verify connectivity between the first and second devices on the bidirectional LSP.