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Cisco Bug: CSCum29958 - An N5K configured for ip directed-broadcast causes duplicate packets

Last Modified

Mar 04, 2018

Products (5)

  • Cisco Nexus 5000 Series Switches
  • Cisco Nexus 5548P Switch
  • Cisco Nexus 5596UP Switch
  • Cisco Nexus 5548UP Switch
  • Cisco Nexus 5596T Switch

Known Affected Releases

6.0(2)N2(1) 6.0(2)N2(2)

Description (partial)

Duplicate packets are being reported when traffic is sent to the directed broadcast address where a Nexus 5000 is the last hop router.

Two nexus 5000's as the last hop routers configured for ip directed-broadcast.  One Nexus 5000 receives the packet and routes it appropriately while the other Nexus 5000 receives the traffic, already on the destination subnet, switches it at layer 2 but also kicks the traffic to the CPU for processing.  In software this Nexus 5000 routes the packet again and forwards the traffic back onto the destination subnet, resulting in duplicate packets being seen.
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