Diameter Signaling Router (DSR): After Peer Restart, Connection Initially fails to Re-establish and Answer Error 3010-001: Unknown Or Unexpected Peer is Sent (Doc ID 2395620.1)

Last updated on JULY 05, 2023

Applies to:

Symptoms

A Diameter peer node has SCTP connection to DSR. When the node or connection experiences abnormal interruption (e.g. node restarts), the association drops and after recovery attempts to re-establish the connection to DSR. The SCTP handshake is successful but Diameter connection fails on first attempt. The peer node retries to establish the connectivity and finally succeeds after one or more attempts.

Based on CEA from DSR back to the peer, the reason provided is unknown peer:

  "AVP: Error-Message(281) l=53 f=--- val=DCL-ERR-3010-001: Unknown or unexpected peer."

Peer node continues attempts to re-establish, sending identical (except for unique identifiers) CER and finally the connection recovers without any changes to either side.

Other elements of the problem signature:
 - little traffic on connection
 - no DPR received due to abnormal peer failure (restart)
 - Responder type connection
 - connection fails one or more tries, then succeeds with no config changes
 - CEA response with error 3010-001 Unknown or unexpected peer

Changes

 Peer or connection failed in a manner that does not issue DPR toward DSR.

Cause

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