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It turns out there are a couple of reasons why you might still want to use Calico in preference to amazon-vpc-cni-k8s plugin:
With amazon-vpc-cni-k8s plugin, the total number of pods per host instance (Kubernetes node) is limited to the number of ENIs multiplied by the number of secondary IPs per ENI – which varies depending on the size of the instance (see this table). For small instances, this can be quite a low number – for example, on a c1.medium you will only be able to launch 10 pods. In contrast, Calico has no limit on the number of pods per node.
The amazon-vpc-cni-k8s plug-in allocates the maximum number of IPs to a given node at start of day, which may reduce efficiency of address use. In contrast, Calico allows the full IP pool space to be used across all nodes.VT
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