[ovs-discuss] OVS vlan tag and dl_vlan in the flow entry

[Hong Wayne]

Hi Ben:


Thanks for your replying.

After my test, when I set two Open vSwitch with VLAN using ovs-vsctl
command like below:

OVS1:
#sudo ovs-vsctl add-port br-int eth1 trunks=15
#sudo ovs-vsctl add-port br-int vnet0_1 tag=15 (VM1)

OVS2:
#sudo ovs-vsctl add-port br-int eth1 trunks=15
#sudo ovs-vsctl add-port br-int vnet0_2 tag=15 (VM2)

And I connect two of trunk ports(eth1) using physical wire. Two of OVS all
connect to POX Controller.

In my case when VM1 ping VM2, Do I need to add the VLAN tag through the
Controller with mod_vlan_vid and strip the VLAN tag with strip_vlan when
packet come back?

Sorry, I got some confused about the VLAN setting.



2013/2/7 Ben Pfaff <blp at nicira.com>

> On Wed, Feb 06, 2013 at 08:11:45PM +0800, Hong Wayne wrote:
> > I already read the FAQ before, but my doubt is about the difference
> between
> > dl_vlan in flow entry and the vlan tag using by ovs-vsctl command.
> >
> > In FAQ (Q: My OpenFlow controller doesn't see the VLANs that I expect.)
> >
> > The sentences for ''But, if you set up OpenFlow flows on your own,
> through
> > a controller or using ovs-ofctl or through other means, then you have to
> > implement VLAN handling yourself.''
> >
> > Does it means the way to ''set dl_valn field'' through Controller or
> > commands? So I need to modify the action field to "normal" into the lists
> > of actions to take dl_vlan effect?
>
> If a packet comes in on an access port, and the flow table needs to send
> it out on a trunk port, then the flow will need to add the VLAN tag with
> mod_vlan_vid.  Conversely, if a packet comes in on a trunk port, and the
> flow table needs to send it out on an access port, then the flow will
> need to strip the VLAN tag with strip_vlan.
>
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