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Symptoms The tunnels are initially signaled correctly with configured min-bandwidth and the tunnels remain stable. Once a given set of RSVP/TE tunnels receives traffic and the Head-End router updates the min-bandwidth, it leads to some problems on the Spirent side. Tunnel signaling breaks and the RSVP process gets stopped. Environment Spirent TestCetner 5.30 and older. RSVP/TE Explanation/Resolution The issue occurred because while raising the events, STC will not make sure all of the data structures are valid. In some rare cases, as there were no safety checks in the code, it leads to a crash. The fix to this issue is available in STC GA's starting in version 5.31. Root Cause The crash happens basically due to access violation and segmentation fault.