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So from my perspective I can tell that problem is completely in architecture and even without something outside of Neutron we cannot solve that.
<div class="">Two releases ago I started to work on hardening that feature but all my ideas was killed by Armando and Assaf. The decided that adding outside dependency will open the doors for a new bugs from dependencies into Neutron [1].</div>
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<div class="">You need to know that there are two outstanding bugs in this feature. There is a internal and outside connectivity split brain. [2] this patch made by me is “fixing” part of the problem. It allows you specify additional tests to verify connectivity
from router to GW.</div>
<div class="">Also there is a problem with connectivity between network nodes. It’s more problematic and like you said it’s unsolvable in my opinion without using external mechanism.</div>
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<div class="">If there will be any need to help with anything I would love to help with sharing my knowledge about this feature and what exactly is not working. If anyone needs any help with anything about this please ping me on email or IRC.</div>
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<div class="">[1] <a href="https://bugs.launchpad.net/neutron/+bug/1375625/comments/31" class="">https://bugs.launchpad.net/neutron/+bug/1375625/comments/31</a></div>
<div class="">[2] <a href="https://review.openstack.org/#/c/273546/" class="">https://review.openstack.org/#/c/273546/</a></div>
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<div class="">Lubosz</div>
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<div class="">On Feb 13, 2017, at 4:10 AM, Anna Taraday <<a href="mailto:akamyshnikova@mirantis.com" class="">akamyshnikova@mirantis.com</a>> wrote:</div>
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<div class="">
<div dir="ltr" class="">To avoid dependency of data plane on control plane it is possible to deploy a separate key-value storage cluster on data plane side, using the same network nodes.
<div class="">I'm proposing to make some changes to enable experimentation in this field, we are yet to come up with any other concrete solution.</div>
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<br class="">
<div class="gmail_quote">
<div dir="ltr" class="">On Mon, Feb 13, 2017 at 2:01 PM <<a href="mailto:cristi.calin@orange.com" class="">cristi.calin@orange.com</a>> wrote:<br class="">
</div>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div lang="EN-US" link="blue" vlink="purple" class="gmail_msg">
<div class="m_6440967129772186155WordSection1 gmail_msg">
<p class="MsoNormal gmail_msg"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" class="gmail_msg">Hi,<u class="gmail_msg"></u><u class="gmail_msg"></u></span></p>
<p class="MsoNormal gmail_msg"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" class="gmail_msg"><u class="gmail_msg"></u> <u class="gmail_msg"></u></span></p>
<p class="MsoNormal gmail_msg"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" class="gmail_msg"><u class="gmail_msg"></u> <u class="gmail_msg"></u></span></p>
<p class="MsoNormal gmail_msg"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" class="gmail_msg">We also operate using Juno with the VRRP HA implementation and at had to patch through several bugs before getting to the Mitaka
release.<u class="gmail_msg"></u><u class="gmail_msg"></u></span></p>
<p class="MsoNormal gmail_msg"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" class="gmail_msg">An pluggable, drop-in alternative would be highly appreciated. However our experience has been that the decoupling of VRRP from
the control plane is actually a benefit as when the control plane is down the traffic is not affected.<u class="gmail_msg"></u><u class="gmail_msg"></u></span></p>
<p class="MsoNormal gmail_msg"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" class="gmail_msg">In a solution where the L3 HA implementation becomes tied to the availability of the control plane (etcd cluster or any other KV
store) then an operator would have to account for extra failure scenarios for the KV store which would affect multiple routers than the outage of a single L3 node which is the case we usually have to account now.<u class="gmail_msg"></u><u class="gmail_msg"></u></span></p>
<p class="MsoNormal gmail_msg"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" class="gmail_msg"><u class="gmail_msg"></u> <u class="gmail_msg"></u></span></p>
<p class="MsoNormal gmail_msg"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" class="gmail_msg"><u class="gmail_msg"></u> <u class="gmail_msg"></u></span></p>
<p class="MsoNormal gmail_msg"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" class="gmail_msg">Just my $.02<u class="gmail_msg"></u><u class="gmail_msg"></u></span></p>
<p class="MsoNormal gmail_msg"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" class="gmail_msg"><u class="gmail_msg"></u> <u class="gmail_msg"></u></span></p>
<p class="MsoNormal gmail_msg"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" class="gmail_msg">Cristian<u class="gmail_msg"></u><u class="gmail_msg"></u></span></p>
<p class="MsoNormal gmail_msg"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d" class="gmail_msg"><u class="gmail_msg"></u> <u class="gmail_msg"></u></span></p>
<p class="MsoNormal gmail_msg"><b class="gmail_msg"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"" class="gmail_msg">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"" class="gmail_msg"> Anna Taraday [mailto:<a href="mailto:akamyshnikova@mirantis.com" class="gmail_msg" target="_blank">akamyshnikova@mirantis.com</a>]
<br class="gmail_msg">
<b class="gmail_msg">Sent:</b> Monday, February 13, 2017 11:45 AM<br class="gmail_msg">
<b class="gmail_msg">To:</b> OpenStack Development Mailing List (not for usage questions)<br class="gmail_msg">
<b class="gmail_msg">Subject:</b> Re: [openstack-dev] [Neutron] Alternative approaches for L3 HA<u class="gmail_msg"></u><u class="gmail_msg"></u></span></p>
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<div lang="EN-US" link="blue" vlink="purple" class="gmail_msg">
<div class="m_6440967129772186155WordSection1 gmail_msg">
<p class="MsoNormal gmail_msg"><u class="gmail_msg"></u> <u class="gmail_msg"></u></p>
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<p class="MsoNormal gmail_msg">In etcd for each HA router we can store key which will identify which agent is active. L3 agents will "watch" this key.<br class="gmail_msg">
All these tools have leader election mechanism which can be used to get agent which is active for current HA router. <u class="gmail_msg"></u><u class="gmail_msg"></u></p>
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<p class="MsoNormal gmail_msg"><u class="gmail_msg"></u> <u class="gmail_msg"></u></p>
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<div class="gmail_msg">
<p class="MsoNormal gmail_msg">On Mon, Feb 13, 2017 at 7:02 AM zhi <<a href="mailto:changzhi1990@gmail.com" class="gmail_msg" target="_blank">changzhi1990@gmail.com</a>> wrote:<u class="gmail_msg"></u><u class="gmail_msg"></u></p>
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<p class="MsoNormal gmail_msg">Hi, we are using L3 HA in our production environment now. Router instances communicate to each other by VRRP protocol. In my opinion, although VRRP is a control plane thing, but the real VRRP traffic is using data plane nic so
that router namespaces can not talk to each other sometimes when the data plan is busy. If we were used etcd (or other), does every router instance register one "id" in etcd ?<u class="gmail_msg"></u><u class="gmail_msg"></u></p>
<div class="gmail_msg">
<p class="MsoNormal gmail_msg"><u class="gmail_msg"></u> <u class="gmail_msg"></u></p>
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<div class="gmail_msg">
<p class="MsoNormal gmail_msg"><u class="gmail_msg"></u> <u class="gmail_msg"></u></p>
</div>
<div class="gmail_msg">
<p class="MsoNormal gmail_msg">Thanks <u class="gmail_msg"></u><u class="gmail_msg"></u></p>
</div>
<div class="gmail_msg">
<p class="MsoNormal gmail_msg">Zhi Chang <u class="gmail_msg"></u><u class="gmail_msg"></u></p>
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<p class="MsoNormal gmail_msg">__________________________________________________________________________<br class="gmail_msg">
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<p class="MsoNormal gmail_msg">-- <u class="gmail_msg"></u><u class="gmail_msg"></u></p>
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<p class="MsoNormal gmail_msg">Regards,<br class="gmail_msg">
Ann Taraday<u class="gmail_msg"></u><u class="gmail_msg"></u></p>
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<div dir="ltr" class="">Regards,<br class="">
Ann Taraday</div>
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