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Cisco Bug: CSCvh88303 - 100+ msec delay between TAU and SGSN context Request (with cached dns entry)

Last Modified

Jul 09, 2019

Products (2)

  • Cisco ASR 5000 Series
  • Cisco ASR 5500

Known Affected Releases

19.6.7.67654 21.5.5 21.8.0 21.8.ca1

Description (partial)

Symptom:
A Cisco MME might introduce 100+ msec delay between incoming TAU and outgoing SGSN context request.

Conditions:
This is happening when DNS is trying to resolve DNS for S4-SGSN and it is falling to the GN-SGSN DNS cache.
This issue is seen only when .3gppnetwork.org DNS query fails and MME has to fallback to SGTP to send .gprs DNS query.
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Bug Details Include

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