Cisco Bug: CSCvh88303 - 100+ msec delay between TAU and SGSN context Request (with cached dns entry)
Jul 09, 2019
- Cisco ASR 5000 Series
- Cisco ASR 5500
Known Affected Releases
18.104.22.168654 21.5.5 21.8.0 21.8.ca1
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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