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Muli-hop BFD session failure with juniper router

Publication Date:  2014-04-30 Views:  1757 Downloads:  0

Issue Description

The session can't turn up when configured Multi-hop BFD with cisco of S5700.

Alarm Information


Handling Process

configured the port number as 4784 manually to setup the BFD sessions on S5700.

Root Cause

1. RFC defined one-hop BFD session’s  TTL should be 254.  And Huawei device use TTL 253 as the multi-hop BFD session’s port. And we believe that most company’s device use the same port for multi-hop BFD sessions.
2、 We  configured multi-hop BFS session as auto mode , that means our device will automatically learn the port of the remote equipment by default. But juniper didn’t  handle the packets with the port as 3784 and without sending us the reply packets. So that our device couldn’t  learn port 4784. And the reason is that when our company developed BFD sessions RFC didn’t finish the standard documentation yet.