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Ben,</div>
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Much thanks for your quick reply.</div>
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1) Yes, I DID check the logs located at <span style="margin: 0px; font-size: 14.6667px; color: rgb(51, 51, 51); background-color: rgb(255, 255, 255); display: inline !important">/usr/local/ovs/var/log/openvswitch. The message is just the same as the one popped
up for ovs-vsctl command.</span></div>
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<span style="margin: 0px; font-size: 14.6667px; color: rgb(51, 51, 51); background-color: rgb(255, 255, 255); display: inline !important"> Following is the pieces from the log files.</span></div>
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<p style="margin: 0px; font: 12px Helvetica">2019-01-22T16:34:08.333Z|00051|bridge|WARN|could not open network device port1 (No such device)</p>
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2) I also tried with the older version 2.0.0 and the results are different with newer version such as 2.11.90. Please see the following blocks.</div>
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a) for the version 2.11.90. The error message will occure since port1 does not exist.</div>
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<p style="margin: 0px; font: 12px Helvetica">[root@localhost ovs]# ovs-vsctl --version</p>
<p style="margin: 0px; font: 12px Helvetica">ovs-vsctl (Open vSwitch) 2.11.90</p>
<p style="margin: 0px; font: 12px Helvetica">DB Schema 7.16.1</p>
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<p style="margin: 0px; font: 12px Helvetica">[root@localhost ovs]# ovs-vsctl show</p>
<p style="margin: 0px; font: 12px Helvetica">ad38d546-6cbc-4291-89f9-f2b4adb2f68d</p>
<p style="margin: 0px; font: 12px Helvetica"><span style="margin: 0px"> <span> </span></span>Bridge "br0"</p>
<p style="margin: 0px; font: 12px Helvetica"><span style="margin: 0px"> <span> </span></span>Port "br0"</p>
<p style="margin: 0px; font: 12px Helvetica"><span style="margin: 0px"> <span> </span></span>Interface "br0"</p>
<p style="margin: 0px; font: 12px Helvetica"><span style="margin: 0px"> <span> </span></span>type: internal</p>
<p style="margin: 0px; font: 12px Helvetica"><span style="margin: 0px"> <span> </span></span>ovs_version: "2.11.90"</p>
<p style="margin: 0px; font: 12px Helvetica">[root@localhost ovs]# ovs-vsctl add-port br0 port1</p>
<p style="margin: 0px; font: 12px Helvetica">ovs-vsctl: Error detected while setting up 'port1': could not open network device port1 (No such device).<span style="margin: 0px"> <span> </span></span>See ovs-vswitchd log for details.</p>
<p style="margin: 0px; font: 12px Helvetica">ovs-vsctl: The default log directory is "/usr/local/var/log/openvswitch".</p>
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b) For version 2.0.0. The error message will not occur even if the port1 was NOT pre-created. </p>
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<p style="margin: 0px; font: 12px Helvetica">root@localhost ~]# ovs-vsctl --version</p>
<p style="margin: 0px; font: 12px Helvetica">ovs-vsctl (Open vSwitch) 2.0.0</p>
<p style="margin: 0px; font: 12px Helvetica">Compiled Apr 19 2018 17:57:34</p>
<p style="margin: 0px; font: 12px Helvetica">[root@localhost ~]# ovs-vsctl add-br br0</p>
<p style="margin: 0px; font: 12px Helvetica">[root@localhost ~]# ovs-vsctl add-port br0 port1</p>
<p style="margin: 0px; font: 12px Helvetica">[root@localhost ~]# ovs-vsctl show</p>
<p style="margin: 0px; font: 12px Helvetica">3bfbc88a-0329-4594-b21d-2d9fd8d97c27</p>
<p style="margin: 0px; font: 12px Helvetica"><span style="margin: 0px"> <span> </span></span>Bridge "br0"</p>
<p style="margin: 0px; font: 12px Helvetica"><span style="margin: 0px"> <span> </span></span>Port "br0"</p>
<p style="margin: 0px; font: 12px Helvetica"><span style="margin: 0px"> <span> </span></span>Interface "br0"</p>
<p style="margin: 0px; font: 12px Helvetica"><span style="margin: 0px"> <span> </span></span>type: internal</p>
<p style="margin: 0px; font: 12px Helvetica"><span style="margin: 0px"> <span> </span></span>Port "port1"</p>
<p style="margin: 0px; font: 12px Helvetica"><span style="margin: 0px"> <span> </span></span>Interface "port1"</p>
<p style="margin: 0px; font: 12px Helvetica"><span style="margin: 0px"> <span> </span></span>ovs_version: "2.0.0"</p>
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<p style="margin-top: 0px; margin-bottom: 0px">Thanks</p>
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<p style="margin-top: 0px; margin-bottom: 0px">Pei</p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>发件人:</b> Ben Pfaff <blp@ovn.org><br>
<b>发送时间:</b> 2019年1月24日 11:51<br>
<b>收件人:</b> pei Jikui<br>
<b>抄送:</b> ovs-discuss@openvswitch.org<br>
<b>主题:</b> Re: [ovs-discuss] Help about "ovs-vsctl add-port" command</font>
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<div class="PlainText">On Thu, Jan 24, 2019 at 03:10:48AM +0000, pei Jikui wrote:<br>
> 1) When I tried to add a port in ovs-version 2.8.1 via "ovs-vsctl add-port br0 port1" command, the following error hint occurred.<br>
> <br>
> "ovs-vsctl: Error detected while setting up 'poas': could not open network device poas (No such device). See ovs-vswitchd log for details.<br>
> ovs-vsctl: The default log directory is "/usr/local/ovs/var/log/openvswitch"."<br>
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We wrote this error message to encourage people to look at the log. It<br>
even says where the log is so that you can look at it more easily.<br>
Despite that, you have not told us what is in the log. Can you explain<br>
how the error message could make this clearer? We really are trying to<br>
be helpful here, but numerous people read the error message and don't<br>
actually pay any attention to it. Why?<br>
<br>
> 2) While the same command works well in ovs version2.0.0.<br>
> <br>
> 3) I googled and there is a answer saying that before adding a port into ovs, the port must be seen via "ifconfig -a" which mean it must exist before being added into ovs.<br>
> <br>
> Is the answer 3) is right? If yes, this is a behavior change from 2.0.0.? If 3) is not the right answer, how I could fix this?<br>
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3) is right and it has not changed since the very first version of OVS<br>
in 2009.<br>
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