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[Yusuf Güngör <2020349@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Hi everyone, we gets random connection lost issues for ALL bgp peers.
Logs attached to issue.

May 20, 2023 @ 12:26:51.276	controller-04	BGP Peer 10.210.48.2 for remote_as=64611 went DOWN.
May 20, 2023 @ 12:26:51.279	controller-04	Connection to peer 10.210.48.3 lost, reason: unpack_from requires a buffer of at least 1 bytes for unpacking 1 bytes at offset 0 (actual buffer size is 0) Resetting retry connect loop: False

Do you have any idea? Thanks.

Environment Details:
 Openstack Version: Wallaby (cluster installed via kolla-ansible)
 OS Version: Ubuntu 20.04.2 LTS Hosts. (Kernel:5.4.0-90-generic)
 Neutron Version: 18.1.2.dev118 ["neutron-server", "neutron-dhcp-agent", "neutron-openvswitch-agent", "neutron-l3-agent", "neutron-bgp-dragent", "neutron-metadata-agent"]
 There exist 5 controller+network node.
 OpenvSwitch used in DVR mode and router HA is disabled. (l3_ha = false)
 We are using a single centralized neutron router for connecting all tenant networks to provider network.
 We are using bgp_dragent to announce unique tenant networks.
 Tenant network type: vxlan
 External network type: vlan

** Affects: neutron
     Importance: Undecided
         Status: New

** Attachment added: "bgp-logs.txt"
   https://bugs.launchpad.net/bugs/2020349/+attachment/5674675/+files/bgp-logs.txt

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https://bugs.launchpad.net/bugs/2020349

Title:
  Neutron Dynamic Routing : Connection to peers lost

Status in neutron:
  New

Bug description:
  Hi everyone, we gets random connection lost issues for ALL bgp peers.
  Logs attached to issue.

  May 20, 2023 @ 12:26:51.276	controller-04	BGP Peer 10.210.48.2 for remote_as=64611 went DOWN.
  May 20, 2023 @ 12:26:51.279	controller-04	Connection to peer 10.210.48.3 lost, reason: unpack_from requires a buffer of at least 1 bytes for unpacking 1 bytes at offset 0 (actual buffer size is 0) Resetting retry connect loop: False

  Do you have any idea? Thanks.

  Environment Details:
   Openstack Version: Wallaby (cluster installed via kolla-ansible)
   OS Version: Ubuntu 20.04.2 LTS Hosts. (Kernel:5.4.0-90-generic)
   Neutron Version: 18.1.2.dev118 ["neutron-server", "neutron-dhcp-agent", "neutron-openvswitch-agent", "neutron-l3-agent", "neutron-bgp-dragent", "neutron-metadata-agent"]
   There exist 5 controller+network node.
   OpenvSwitch used in DVR mode and router HA is disabled. (l3_ha = false)
   We are using a single centralized neutron router for connecting all tenant networks to provider network.
   We are using bgp_dragent to announce unique tenant networks.
   Tenant network type: vxlan
   External network type: vlan

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