1b- SRIOV bypasses vrouter for passthrough networking
SR-IOV or sriov interfaces have both physical functions (PFs) and multiple virtual functions (VFs).
Intel SR-IOV Explanation:
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https://www.juniper.net/documentation/en_US/contrail4.0/topics/concept/sriov-with-vrouter-vnc.html
virtio: https://wiki.libvirt.org/page/Virtio
virtio like vmxnet3 and xenvirt are part of the DPDK stack
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