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https://issues.apache.org/jira/browse/CLOUDSTACK-10377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16502877#comment-16502877
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ASF GitHub Bot commented on CLOUDSTACK-10377:
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rhtyd commented on issue #2672: CLOUDSTACK-10377: Fix Network restart for Nuage
URL: https://github.com/apache/cloudstack/pull/2672#issuecomment-394958866
 
 
   LGTM, based on code reviews and results I'm okay to merge this as well

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> Nuage VSP regression fails in NetworksWithCleanup test since introduction of 
> fix for CLOUDSTACK-9114 in ACS 4.11&master
> -----------------------------------------------------------------------------------------------------------------------
>
>                 Key: CLOUDSTACK-10377
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-10377
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the 
> default.) 
>    Affects Versions: 4.12, 4.11.1.0
>         Environment: ACS 4.11 or master with Nuage VSP 5.2.x
>            Reporter: Raf Smeets
>            Assignee: Frank Maximus
>            Priority: Major
>
> Nuage VSP regression fails in NetworksWithCleanup test since introduction of 
> fix for CLOUDSTACK-9114 in ACS 4.11&master
> In Nuage Networks QA regression cycle, cloudstackExpress is failing for 
> master & 4.11 in expressrestartNetworksWithCleanup test.
>  The error is Unable to create a deployment.
>  Issue is caused by fixing 
> https://issues.apache.org/jira/browse/CLOUDSTACK-9114
>   
>  Reason is that for non-redundant routers, a strategy was implemented where 
> first a new VR is deployed, then old VR is powered-off/destroyed, and the new 
> VR is again re-programmed. With this strategy, two identical VRs may be up 
> for a brief moment (few seconds) where both can serve traffic, however the 
> new VR performs arp-ping on its interfaces to update neighbours. After the 
> old VR is removed, the new VR is re-programmed which among many things 
> performs another arpping. The theoretical downtime is therefore limited by 
> the arp-cache refresh which can be up to 30 seconds. In my experiments, 
> against various VMware, KVM and XenServer versions I found that the downtime 
> was indeed less than 30s, usually between 5-20 seconds. Compared to older ACS 
> versions, especially in cases where VRs deployment require full volume copy 
> (like in VMware) a 10x-12x improvement was seen.BUT NUAGE PLUGIN FAILS AS IP 
> ADDRESS IS ALREADY IN USE.



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