[one-users] Isolated VMs on different Hosts can't communicate - ONE 4.8, OVS 2.0.1

[Hüning, Christian]

Hi there,

 

I have a cluster of 5 hosts running with openNebula 4.8 and just recently
configured OpenvSwitch on all these nodes.

Networking is working just fine. This holds also true for VLAN isolation,
but just as long as the VMs belonging to the isolated Virtual Network reside
on the same physical host. When I move these VMs to different hosts, they
can’t communicate with each other anymore. Non-isolated nodes can
communicate to everywhere without problems.

 

Is that intentional? I chose OpenVswitch because the ONE docs say it
requires no support from the switch hardware (or more specifically it says
802.1Q would require support).

 

A colleague suggested it might have to do with the switch not forwarding the
tagged packets from Open vSwitch. Can that be the cause? Does OVS even tag
the packets?

 

Here’s my environment:

OpenNebula 4.8

Open vSwitch 2.0.1

Cisco Switch

Host OS: Ubuntu Server 14.04 LTS (latest patches)

 

Output from ‘ovs-vsctl show’:

  Bridge "br0"

        Port "vnet3"

            Interface "vnet3"

        Port "bond0"

            Interface "bond0"

        Port "vnet1"

            Interface "vnet1"

        Port "vnet2"

            Interface "vnet2"

        Port "vnet5"

            Interface "vnet5"

        Port "br0"

            Interface "br0"

                type: internal

        Port "vnet0"

            Interface "vnet0"

        Port "vnet4"

            Interface "vnet4"

    ovs_version: "2.0.1"

 

Where “br0” is my ovs bridge interface which has the external ‘real’ IP
address configured and “bond0” is a link aggregated dual Gbit interface
which is the port for “br0”

 

I would greatly appreciate some suggestions or ideas on this, since I am a
bit lost.

Cheers,

Christian

 

 

-----------------------------------------------

Christian Hüning, BSc.

Fakultät Technik und Informatik, Department Informatik

Berliner Tor 7

20099 Hamburg

Web: http://www.mars-group.org

 

 

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