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However, typically, in Kubernetes each pod only has one network interface (apart from a loopback) which is not enough for a production ready telco network function. For this problem, there is an open-source solution, Multus, that can solve it. Multus is a container network interface (CNI) plugin for Kubernetes that enables attaching multiple network interfaces to pods. With Multus, you can create a multi-homed pod that has multiple interfaces. Multus CNI has already support many network CNIs, including Calico, Flannel, Userspace CNI (oveovs-dpdk/vpp), OVN-Multi CNI, SRIOV-NIC CNI and SMartNIC CNI. Developers can specify different network CNI for different network planes to realize container multi network planes. For example, control network plane can chose traditional CNIs with lower performance like Calico, Flannel; while data/user network plane can chose CNIs with better forwarding performance, for example SRIOV-NIC CNI.
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