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[LIU Yulong <yulong@xxxxxxxxxxxxx>]

Public bug reported:

The ovs-agent will lost some tunnels to other nodes, for instance to DHCP node or L3 node, these lost tunnels can sometimes cause VM failed to boot or dataplane down.
When subnets or security group ports quantity reaches 2000+, this issue can be seen in high probability.

This is a subproblem of bug #1813703, for more information, please see the summary:
https://bugs.launchpad.net/neutron/+bug/1813703

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1813715

Title:
  [L2][scale issue] ovs-agent meet unexpected tunnel lost

Status in neutron:
  New

Bug description:
  The ovs-agent will lost some tunnels to other nodes, for instance to DHCP node or L3 node, these lost tunnels can sometimes cause VM failed to boot or dataplane down.
  When subnets or security group ports quantity reaches 2000+, this issue can be seen in high probability.

  This is a subproblem of bug #1813703, for more information, please see the summary:
  https://bugs.launchpad.net/neutron/+bug/1813703

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