Sorry for cross-posting!

I would like to inquiry about the roadmap of host network management in oVirt in order to
make sure the ideas to be worked on are welcomed by community.

I did some initial investigation on the following topics. I am not very familiar with them, so the information may contain some inaccuracies or errors.

netcf:

It provides cross-platform network configuration library/tool by converting the XML definition of an interface into local config file. It's already used by libvirt to manage host network interfaces.It supports all network entities including bridge, vlan, bond, nic. And it also supports configuration rollback. The benefit for vdsm is making host network stack configuration easy to port to other distros.

Problems found:
It doesn't restore interface live state during config transaction now. There's a feature request submit for it. There're some advanced settings not supported in netcf, like 'NM_CONTROLLED' and some less used bonding options.

It doesn't provide python binding officially. But we can use libvirt API to integrate it into vdsm. It shouldn't have any impact on engine side.


IEEE 802.1Qbg(VEPA)

It can offload network switching from server to external physical switch. It makes all VMs' traffic visible to physical switch, and therefore the existing switch functions (firewall, QoS etc) can be applied to VM immediately. The offload also frees up the server resource used by switching. Now libvirt supports it by using macvtap as vif and working with lldpad, which registers vif's mac/vlan information to the physical switch. We can just add a 'virtualport' element to an interface XML definition to add a VEPA interface. Probably, to support it in oVirt we still need configure lldpad and query available VSI types for virtualport profile.


quantum

Both the plugins openvswitch and linuxbridge stores abstract network entities (network, port) in database and create bridge/vlan via the tool ip/brctl or ovs-vsctl on demand. Only one bridge is created on one server and one vlan is created for each virtual network. That means that only one nic can be configured for vm network. It doesn't configure nic or bond even if openvswitch also supports bond. Both of traditional network stack configuration and quantum will be supported oVirt for different purpose, right?

   Any comments? Thanks!
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