[ovs-discuss] problem about vlan

[韩金朋]

hi,friend:
I have four vm on host.

Bridge "kvmbr0"
        Port "vnet1"
            tag: 10
            Interface "vnet1"
        Port "kvmbr0"
            Interface "kvmbr0"
                type: internal
        Port "eth0"
            Interface "eth0"
        Port "vnet3"
            tag: 30
            Interface "vnet3"
        Port "vnet2"
            tag: 10
            Interface "vnet2"
        Port "vnet0"
            tag: 10
            Interface "vnet0"
    ovs_version: "1.7.1"

vm1:10.190.30.2(vnet1)
vm3:10.190.30.5(vnet3)
I want to make vm1 communicate with vm3 by modifying the vlan tag.I used ovs-ofctl command add flow 
ovs-ofctl add-flow br0 cookie=1,nw_src=10.190.30.2,nw_dst=10.190.30.5,ip,actions=mod_vlan_vid:9,NORMALbut it did not work. You tell me the vnet1 and vnet3 is access port ,not trunk port,but I can not find in the documentation how to define a port access port or trunk port .Plus vlan tag on the port is access port, without is the trunk port? I read ovs-vswitchd.conf.db.5 document , at Port Table part,VLAN Configuration:vlan_mode :  optional string, one of access, native−tagged,native−untagged, or trunkthen I set vnet1 and vnet3 vlan mode is trunk,they can communication,did not set any flow.when I read FAQ,Q: My OpenFlow controller doesn't see the VLANs that I expect.

A: The configuration for VLANs in the Open vSwitch database (e.g. via
   ovs-vsctl) only affects traffic that goes through Open vSwitch's
   implementation of the OpenFlow "normal switching" action.  By
   default, when Open vSwitch isn't connected to a controller and
   nothing has been manually configured in the flow table, all traffic
   goes through the "normal switching" action.  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.

   You can use "normal switching" as a component of your OpenFlow
   actions, e.g. by putting "normal" into the lists of actions on
   ovs-ofctl or by outputting to OFPP_NORMAL from an OpenFlow
   controller.  In situations where this is not suitable, you can
   implement VLAN handling yourself, e.g.:

       - 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 can add
         the appropriate VLAN tag with the "mod_vlan_vid" action.

       - 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 can
         strip the VLAN tag with the "strip_vlan" action.this tell me "implement VLAN handling yourself",OpenvSwitch does not support inter-vlan communication or I use ovs-ofctl command implement VLAN handling.please answer,thanks.




韩金朋
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