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Cisco Bug: CSCtd72416 - REI: ASR1k observing VFR tracebacks during test of malformed fragments

Last Modified

Dec 17, 2015

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases


Description (partial)


An error message with a traceback is observed on router console that has the format, %FRAG-3-REASSEMBLY_DBG: Reassembly/VFR encountered an error: VFR failed at refrag:, first fragment length 370, non-first frag total length 608. The length values may change depending on the actual fragmented packets received by the router.


The ip virtual reassembly (VFR) feature is enabled on the interface that receives  malformed fragmented packets. VFR drops such problem packets as they cannot be correctly processed and generates the error message as a warning.
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