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Cisco Bug: CSCvu53480 - N9K VXLAN EVPN - static route VRF leaking issue upon recursive lookup

Last Modified

Sep 24, 2020

Products (67)

  • Cisco Nexus 9000 Series Switches
  • Cisco Nexus 3636C-R Switch
  • Cisco Nexus 3548 Switch
  • Cisco Nexus 93600CD-GX Switch
  • Cisco Nexus 3548-X Switch
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 92348GC-X Switch
  • Cisco Nexus 9396PX Switch
  • Cisco Nexus 92160YC-X Switch
  • Cisco Nexus 3132Q-V Switch
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Known Affected Releases

9.2(1) 9.2(2) 9.2(3) 9.2(4) 9.3(1) 9.3(2) 9.3(3) 9.3(4)

Description (partial)

Symptom:
In a VXLAN fabric, route leaked in between VRF may not contain the tunnel information, leading to traffic sent without VXLAN header in the fabric. 

This issue is related to recursive lookup, where NH for the destination IP is reachable over the fabric.
The issue is only present when the route to reach the recursive NH is a static route leaked from the VRF where the NH resides.

The presence of this static route may be justified by the fact that the NH can move around the fabric/VTEPs.

Conditions:
+ NXOS release: 9.2(1), 9.2(2), 9.2(3), 9.2(4), 9.3(1), 9.3(2), 9.3(3), 9.3(4)

+ Vxlan Fabric

+ Host reachable using recursive route leaked from another VRF

+ The NH for the recursive resides on another VTEP

+ Static route present and leaked locally to point toward NH

+ The leaking of the static route is done using route-target import/exports
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Bug Details Include

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