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My understanding is that we have a global gre_sys device for all the gre vports. All the traffics will be sent and received by this gre_sys device, based on the different parameters carried in the packets, the packets will further be delivered to different
gre vports.</div>
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And this also works for other type of tunnel interfaces such as vxlan_sys genev_sys etc ...</div>
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Is my understanding right?</div>
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Thanks.</div>
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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> pei Jikui <jkpei@hotmail.com><br>
<b>发送时间:</b> 2019年4月16日 10:48<br>
<b>收件人:</b> Gregory Rose; ovs-discuss@openvswitch.org<br>
<b>主题:</b> 回复: [ovs-discuss] gre_sys vxlan_sys . genev_sys etc interfaces</font>
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Much thanks for the help.</div>
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What're the scenarios that OVS uses these devices to send and receive the packets?</div>
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Thanks</div>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>发件人:</b> Gregory Rose <gvrose8192@gmail.com><br>
<b>发送时间:</b> 2019年4月15日 23:51<br>
<b>收件人:</b> pei Jikui; ovs-discuss@openvswitch.org<br>
<b>主题:</b> Re: [ovs-discuss] gre_sys vxlan_sys . genev_sys etc interfaces</font>
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<div class="x_x_moz-cite-prefix">On 4/15/2019 2:38 AM, pei Jikui wrote:<br>
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hi,</div>
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During the initialization of ovs, lots of interfaces such as gre_sys,genev_sys,vxlan_sys will be created and could be shown by "ip a".</div>
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My question is , why does ovs create these interfaces and how it uses them in which kinds of scenarios?</div>
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The Linux kernel has "fully backed" devices for net name spaces. These are those devices.<br>
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- Greg<br>
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Much thanks.</div>
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