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Cisco Bug: CSCul57214 - process pvstag-io crashed when added vlan in pvrst

Last Modified

Jul 20, 2018

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

5.1.0.CE

Description (partial)

Basic description:
If a subinterface is configured on a PVRST-protected port, but the associated VLAN is not configured as protected by PVRST, then the data structures inside the pvstag-io process can become inconsistent when the port is unconfigured from PVRST. Data structures are created to track the VLAN, but when the port is deleted, these data structures are not cleaned up, and incorrectly reference the parent port data structure (which no longer exists). If the port and VLAN are subsequently configured for PVRST, then the old port data structure will be accessed, causing the pvstag-io process to abnormally terminate.

Symptom:
Symptom:
pvstag-io process abnormally terminates. If the protected port is a bundle interface, the standby process will continuously restart, outputting error messages about checkpoint data not being found.

Conditions:
Condition:
Configure PVRST on a port which also includes VLANs which are not protected by PVRST. Remove the PVRST port configuration. Subsequent attempts to configure PVRST on the port & VLAN which was not previously protected will trigger the issue.
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