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Cisco Bug: CSCui93622 - [gn-gp]: Unnecessary messages when default bearer & rule QoS modfied

Last Modified

Dec 26, 2016

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

15.0(1) 16.0(1)

Description (partial)

Symptom:
Unnecessary flow of messages are seen when default bearer QoS & rule QoS are modified during handover from LTE to 3G.

For example :

Following message flows are seen.

1. primary pdp context QoS is modified as expected ( made QCI =6 from QCI=5 )
2. UPCQ & R - All rules from Primary PDP Context are deleted first - TFT Opcode: delete existing TFT
3. IPCA Request sent to create secondary PDP Context.
4. CPCQ & R sent to create Secondary PDP context with all rules on it (as sent in IPCA) -  TFT Opcode: create new TFT
5. UPCQ & R sent to delete 1 rule from Secondary PDP Context - TFT Opcode: delete packet filters from existing TFT
6. UPCQ & R sent to create new rules on primary PDP Context - TFT Opcode: create new TFT

These many messages are not required here. The same operation could have been carried out with far lesser number of messages.

Conditions:
1. LTE call established with 1 default bearer (QCI =5 )  having attached 3 dynamic rules.
2. Handover initiated to 3G and during HO, Default-Bearer-QoS is changed (new QCI =6 ) & also one of dynamic rule QoS is modified to match it with new Default-Bearer-QoS values.
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