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[Arjun Baindur <xagent@xxxxxxxxx>]

Public bug reported:

Using Rocky, with OVS. Live migrated a VM on regular VLAN based provider
network. Network connectivity was stopped, no GARP packets observed on
tcpdump. Things started working after VM initiated traffic, causing MAC
to be relearned.

Looking at the code, send_ip_addr_adv_notif(), in ip_lib.py is
responsible for using arping utility to send out a GARP. But this is
only referenced in l3-agent code. This is a provider network. No
routers, no floating IPs.


I see this very old bug in OVN: https://bugs.launchpad.net/networking-ovn/+bug/1545897

But we are not using OVN, and that fix was fixed in OVN code itself.
This is Openstack with OVS agent.

How is live migration and GARP handled for fixed IPs?

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1866139

Title:
  GARP not sent on provider network after live migration

Status in neutron:
  New

Bug description:
  Using Rocky, with OVS. Live migrated a VM on regular VLAN based
  provider network. Network connectivity was stopped, no GARP packets
  observed on tcpdump. Things started working after VM initiated
  traffic, causing MAC to be relearned.

  Looking at the code, send_ip_addr_adv_notif(), in ip_lib.py is
  responsible for using arping utility to send out a GARP. But this is
  only referenced in l3-agent code. This is a provider network. No
  routers, no floating IPs.

  
  I see this very old bug in OVN: https://bugs.launchpad.net/networking-ovn/+bug/1545897

  But we are not using OVN, and that fix was fixed in OVN code itself.
  This is Openstack with OVS agent.

  How is live migration and GARP handled for fixed IPs?

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