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[Bug 2129750] [NEW] [OVN] Error when using tunnelled external networks and multihoming GW routers

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Rodolfo Alonso <2129750@xxxxxxxxxxxxxxxxxx>
Date: Fri, 24 Oct 2025 10:35:31 -0000
Reply-to: Bug 2129750 <2129750@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx

Public bug reported:

The Neutron API fails when adding a second external tunnelled network to
a router, with the following error:
https://paste.opendev.org/show/bMNXb8L1t4iJbl2J1EPW/

If one single network is used, the Neutron API works fine. If physical
external networks (flat, VLAN) are used, the Neutron API works fine too.

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2129750

Title:
  [OVN] Error when using tunnelled external networks and multihoming GW
  routers

Status in neutron:
  New

Bug description:
  The Neutron API fails when adding a second external tunnelled network
  to a router, with the following error:
  https://paste.opendev.org/show/bMNXb8L1t4iJbl2J1EPW/

  If one single network is used, the Neutron API works fine. If physical
  external networks (flat, VLAN) are used, the Neutron API works fine
  too.

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