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Cisco Bug: CSCun39803 - OTV Drops ARP Broadcasts due to corrupt Flood List Pointer

Last Modified

Dec 17, 2018

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases

15.3(3)S 15.4(1)S

Description (partial)

Intermittent connectivity loss between hosts at different OTV sites.  Pinging from one host to the other more than 8 times restores connectivity for about 8-10 minutes.  Packet captures show ARP request broadcasts from a host at one site not being received by the host at the other site for about 7-8s, and then suddenly starting to work.

This problem has a tendency to get worse over time, with more and more hosts being affected over the course of a week or two until connectivity between sites is essentially gone.

Additionally ARP requests both arriving from an Overlay interface or from the inside interface could be lost.

ASR1K running 15.4 or 15.3 code, possibly earlier code, with OTV configured.
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