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Cisco Bug: CSCuw40975 - GRE tunnel terminating on N3K drops OSPF packets with ttl not 1 in hw

Last Modified

Apr 17, 2017

Products (8)

  • Cisco Nexus 3000 Series Switches
  • Cisco Nexus 3064 Switch
  • Cisco Nexus 3016 Switch
  • Cisco Nexus 3172TQ Switch
  • Cisco Nexus 3064-T Switch
  • Cisco Nexus 3048 Switch
  • Cisco Nexus 3132Q Switch
  • Cisco Nexus 3172 Switch

Known Affected Releases


Description (partial)

Establishing an OSPF neighbor over a tunnel interface terminating on a Nexus 3100 switch will fail if the sending device is transmitting the OSPF packets with a TTL value greater than 1.

These OSPF packets will be dropped in hardware and not sent to the cpu for further processing.

The GRE tunnel must be terminating on the Nexus 3100 switch, and the GRE payload must be an ip OSPF packet  with the TTL set to a value other than 1.
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Bug Details Include

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