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Cisco Bug: CSCum27065 - 511-SIT: PVRSTAG doesn't send BPDU packet after RPFO

Last Modified

Jul 21, 2018

Products (7)

  • Cisco Carrier Routing System
  • Cisco IOS XR Software
  • Cisco ASR 9922 Router
  • Cisco ASR 9010 Router
  • Cisco ASR 9006 Router
  • Cisco ASR 9001 Router
  • Cisco ASR 9912 Router

Known Affected Releases

4.3.2.CE 4.3.3.CE 4.3.4.CE 5.1.1.CE

Description (partial)

Basic Description:
Following an RP switchover, the pvstag-io process tries to replay its connections with the packet infrastructure. If this fails (e.g. because the packet infrastructure is not ready), a timer is started to replay the connections. When this timer fires, the timer handling code does not correctly handle it and ends up in a tight loop repeatedly servicing the same timer. The timer cannot be cleaned up because the process never returns to its event loop to process any results from the packet infrastructure registration. This means that no PDUs are sent out, and the process does not respond to management requests.

Following an RP switchover, PVRSTAG/PVSTAG PDUs are not sent out and PV(R)STAG manageability commands time out. CPU usage is also increased with pvstag-io showing a high CPU usage.

Seen when performing a failover with PV(R)STAG configured on a bundle subinterface.

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