Description
This article describes local_diag code 0x03 and 0x23 in bfd log.
BFD session state UP -> Down local_diag = 0x03.
BFD session state UP -> Down local_diag = 0x23.
Solution
When dynamic routing flap, such as OSPF or BGP state UP -> Down, check the log, BFD state is UP -> Down log before related routing protocol log, and local_diag code is 0x03 or 0x23.
Analysis.
In RFC 5880, it is defining the code from 0 -8, 9-31 was unassigned.
https://tools.ietf.org/html/rfc5880
Value BFD Diagnostic Code Name
----- ------------------------
0 No Diagnostic
1 Control Detection Time Expired
2 Echo Function Failed
3 Neighbor Signaled Session Down
4 Forwarding Plane Reset
5 Path Down
6 Concatenated Path Down
7 Administratively Down
8 Reverse Concatenated Path Down
9-31 Unassigned
For Fortinet, here is the define:
0x01: Local inactive timer expired.
0x03: Remote peer indicates it's down.
0x23: Remote peer indicates restarting.
Solution.
So for BDF local_diag code 0x03 and 0x23, customer needs to investigate remote peers other than FGT.
