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Cisco Bug: CSCul57490 - ISM drops non-first fragments get dropped for GRE / PPTP traffic

Last Modified

Apr 07, 2017

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases


Description (partial)

Intermittently non-first fragments gets dropped for GRE / PPTP traffic when passed through ISM card.

Issue is observed when consecutive fragmented packets with same (src-dst) & (ip identifier) reach ISM. It is a rare scenario for real world traffic. Usually IP identifier for different fragmented packets for same source-destination will be unique.
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