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Cisco Bug: CSCup24194 - 15.0-MR4 SAEGW Sby Chassis "SESSMGR Not Ready" during 16.1->15.0 Dngrade

Last Modified

Dec 25, 2016

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

15.0(21)

Description (partial)

Symptom:
This problem may be seen in ASR 5500 Active-Standby ICSR SAE-GW system during software downgrade from StarOS 16.0 to 15.0.

Conditions:
In StarOS 16.0, as a part of VoLTE enhancements, support was added for separate GTP-U IP for handling ims media traffic and other remaining traffic in order to facilitate expedited processing for volte media traffic. If 16.0 configuration has such separate bind IP configurations and the 15.0 configurations doesn't, and in-service downgrade is followed to bring up the standby gateway with 15.0 configuration (without additional bind IP for ims media) whereas active gateway still has sessions established with the additional bind IP) -- under this situation, the standby chassis after booting up with 15.0 software and configuration, shows "SESSMGR Not Ready" in the "show session recovery status verbose" output. It never goes to Ready state even after waiting for a long time.
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