[ovs-discuss] tunctl tap device attached to openvswitch bridge, why the type changed to system interface

张伟 zhangwqh at 126.com
Sat Nov 22 08:40:06 UTC 2014

I think I have some understanding for the relation between n_links and dst[start..end]. dst[start..end] stores the selected link. 2^(end-start+1)-1 >= n_links. At first, I thought n_links represents the ofports, it seems not. What is the relation between n_links and ofports. Eg, 
I want ofports 2, 5, 6, 8, 9 as the multipath links. How I should define the n_links, and make multipath only select a ofport from 2, 5, 6, 8 and 9? 
I check the bundle feature. It has the parameter slave_type, slaves:[s1, s2, ...]. We can define slave_type is ofport, and define the ofports we want 2, 5, 6, 8, 9. 
However, how multipath works.  How should we define this? 

At 2014-11-22 06:50:31, "Ben Pfaff" <blp at nicira.com> wrote:
>On Fri, Nov 21, 2014 at 10:28:02AM +0800, ???? wrote:
>> I have two physical machines A and B. Each machine I want to create
>> a tap device and vxlan device, configure the flow entries according
>> my requirement. I want to successfully ping the tap device on
>> machine B from the tap device on machine A.
>> However, if I use tunctl -t tap0 to create the tap device and then
>> attach to the openvswitch. When I check the tap device type, it is
>> empty. From the man, the empty means system type. Usually the
>> physical eth has the system type. When I use ovs-vsctl add-port
>> bridge-name device-name -- set Interface device-name type=internal
>> to create the device and attach, it works. From google, internal
>> type actually is the tap device. This is my confused question: why I
>> directly use tunctl to create the tap device and attach to the
>> bridge, my tap device will directly drop the packets.
>Internal devices are not tap devices, unless you are using the
>userspace switch (datapath_type=netdev), so they do not behave
>> I want to configure the multipath feature using ovs-ofctl add-flow
>> command line. However, I do not clearly know how to do that. Can you
>> give me some advice? Where I can check and find how to use it? I
>> have checked the man ovs-ofctl and man 5 ovs-vswitchd.conf.db and
>> did not find useful information.
>What information do you want?  It sounds like you have already read
>the documentation.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://openvswitch.org/pipermail/ovs-discuss/attachments/20141122/ed2dc3db/attachment-0002.html>

More information about the discuss mailing list