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Cisco Bug: CSCvt98145 - N9K: Orphan port connectivity issues with Fabric Peering in VxLAN EVPN VPC set up

Last Modified

Aug 27, 2020

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases

9.3(3)

Description (partial)

Symptom:
In a Nexus 9000 VxLAN EVPN topologies which have VTEPs in VPC with Fabric Peering(Virtual Peer-link), Orphan ports connected to VTEPs will have connectivity issues between each other. This is due to ARP requests from VTEP which go via PIP tunnel to other remote VPC VTEP are sent out with outer destination MAC of all zeroes(0000.0000.0000) due to hardware programming issue on the VTEP. The Spine switch which receives this frame with outer destination MAC of 0000.0000.0000 will drop causing the hosts to have incomplete ARP entries.

Conditions:
This is a corner case issue which can be seen with a spine reload or VTEP reload and timing issues.
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Bug Details Include

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