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Cisco Bug: CSCvt02599 - Add support for additional Local Subnets for SNAT

Last Modified

May 16, 2020

Products (1)

  • Cisco Application Policy Infrastructure Controller (APIC)

Known Affected Releases

5.0(0.272a)

Description (partial)

Symptom:
Cisco ACI CNI is enabling SNAT for subnets that are "local" to the cluster VRF table. A local subnet is defined as a subnet in the same VRF table as the Kubernetes cluster.

Conditions:
Cisco ACI CNI gets the list of "local" subnets from the directly attached leaf switches.

Since Cisco ACI deploys subnets on-demand, it is possible to be in a situation where the subnet is local, but is not deployed on the leaf switches where the K8S nodes are connected and Cisco ACI CNI will not install a "DO NOT" SNAT rule for the subnet.
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