2.6. OpenStack Networking

This section outlines the top new features for the Networking service.

Full support for Distributed Virtual Routing: DVR is now fully supported in Red Hat OpenStack Platform 10. Users are able to choose between centralized routing (the default), and DVR. With DVR, each Compute node manages routing functionality.
Users are advised to refer to the documentation, and carefully plan whether centralized routing or DVR better suits their needs and overall network architecture.
DSCP Markings: Open vSwitch can now add DSCP marks to outbound network traffic, as defined in RFC 2474.
Enhanced NFV Datapath with Director Integration: Red Hat OpenStack Platform 10 adds support for SR-IOV PF passthrough (using vnic_type=direct-physical), in addition to VF passthrough. SR-IOV deployment can now be automated using the director. In addition, OVS-DPDK 2.5 is now fully supported and integrated with director.
Warning
Do not upgrade to the Red Hat Enterprise Linux 7.3 kernel without also upgrading from Open vSwitch (OVS) 2.4.0 to OVS 2.5.0. If only the kernel is upgraded, then OVS will stop functioning.
Networking VLAN Aware Virtual Machines: Certain types of virtual machines require the ability to pass VLAN-tagged traffic over one interface, which is now represented as a `trunk` networking port. To create a trunk for use by a virtual machine, users must create a single parent port and one or more sub-ports. All of the ports and respective networks will be available to the interface, which should tag traffic on its interface using 802.1q.

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