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Cisco Bug: CSCus55772 - MME stops sending SCTP Data to ENB after network flap

Last Modified

Dec 24, 2016

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

15.0 16.0(907) 19.4.0 20.1.0 20.1.a0 20.1.v0 21.0.0 21.0.v0

Description (partial)

Symptom:
MME stops sending SCTP data to few ENB after the network connectivity issue

Conditions:
Create ongoing traffic b/w enb and MME. Sends lots of gap acks from eNB to MME (about 1600 msgs)

Scenario has been identified where during the SCTP SACK processing, a timer to send the further packets from the internal queue is not started. Also, during the network fluctuation the peer receive window may not be correctly computed because of missed SACKs, so need to adjust that as per the latest value received from the peer (eNodeB).
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