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Cisco Bug: CSCvt64910 - MTU value returned to pfi-protect in asr9k CXR platform is incorrect

Last Modified

Sep 02, 2020

Products (11)

  • Cisco ASR 9000 Series Aggregation Services Routers
  • Cisco ASR 9910 Router
  • Cisco ASR 9922 Router
  • Cisco IOS XR Software
  • Cisco ASR 9010 Router
  • Cisco ASR 9904 Router
  • Cisco ASR 9006 Router
  • Cisco ASR 9001 Router
  • Cisco ASR 9901 Router
  • Cisco ASR 9912 Router
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Known Affected Releases


Description (partial)

In ASR9k CXR systems, MTU value used by pfi-protect component is incorrect. (Correct MTU value for ASR9k is 1084, but value used is 7708). Due to this issue, if more than 3 interfaces flaps in quick succession, bfd_agent process can bulk more than 3 "BFD session down"  notifications in one message and then that  notification would fail, which in term causes FIB/forwarding  transient inconsistency

For this problem to trigger, there need to be at least 4 "BFD session down" events that should occur in very quick succession. This problem is very specific to asr9k CXR platform, and this problem is not present in any other XR platforms.
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