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Cisco Bug: CSCvv00023 - SCTP Bundle Status disabled is not supported at diamproxy

Last Modified

Sep 17, 2020

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

21.10.2.71286

Description (partial)

Symptom:
Customer is complaining about diameter connection flapping with AAA server. Upon further analysis it is found that

customer tried to  apply the following sctp-template to solve the issue without success:
 
  sctp-param-template sctp-swm
    sctp-max-mtu-size 1316
    sctp-start-mtu-size 1316
  exit
 
SCTP-default settings:
 
SCTP Parameter Template Name         : sctp-swm
SCTP Alpha                           : 5
SCTP Beta                            : 10
SCTP Checksum Type                   : CRC32
SCTP Valid Cookie Lifetime           : 60000ms
SCTP Max Assoc Retrans               : 10
SCTP Max Number of In Streams        : 16
SCTP Init Retransmissions            : 5
SCTP Max MTU                         : 1316bytes
SCTP Max Number of Out Streams       : 16
SCTP Path Retransmissions            : 5
SCTP Min MTU                         : 508bytes
SCTP RTO Initial                     : 3000ms
SCTP RTO Max                         : 60000ms
SCTP RTO Min                         : 1000ms
SCTP Sack Frequency                  : 2
SCTP Sack Period                     : 200ms
SCTP Start MTU                       : 1316bytes
SCTP Heartbeat Status                : Enabled
SCTP HeartBeat Timer                 : 30s
SCTP Bundle Status                   : Disabled <<<<<<<<<<<
SCTP Bundle Timer                    : 0ms
SCTP Alternate Accept Flag           : Enabled
 
Questions:
1. Can you tell us why despite bundle status seems to be disable ePDG still bundle SCTP packets ?
2. Why despite we configure SCTP Max MTU 1316 we still see SCTP packets with more than that ?

Conditions:
Setting SCTP_NODELAY to 1 will disable bundling. This is not configurable in UNIX
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