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[Carl Baldwin <carl@xxxxxxxxxxxxx>]

Public bug reported:

This issue has been seen twice causing this related bug [1]. What
happens is the DHCP agent updates the port using the subnet_id but not
the actual ip_address that the port already has. So, the server
allocates a new IP address and throws out the old one.

What it should do is recognize that there is already an IP address on
the port that satisfies the request and avoid the churn.

A previous attempt was made [1] to address this bug but was reverted
because it had a side effect [3].  Need a fix that addresses this issue
without the side-effect.

[1] https://bugs.launchpad.net/neutron/+bug/1622616/
[2] https://review.openstack.org/#/c/369051/
[3] https://bugs.launchpad.net/neutron/+bug/1623800

** Affects: neutron
     Importance: High
     Assignee: Carl Baldwin (carl-baldwin)
         Status: Confirmed


** Tags: l3-ipam-dhcp

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https://bugs.launchpad.net/bugs/1625334

Title:
  Update port with subnet_id in fixed_ips allocates a new IP when
  existing one could be used.

Status in neutron:
  Confirmed

Bug description:
  This issue has been seen twice causing this related bug [1]. What
  happens is the DHCP agent updates the port using the subnet_id but not
  the actual ip_address that the port already has. So, the server
  allocates a new IP address and throws out the old one.

  What it should do is recognize that there is already an IP address on
  the port that satisfies the request and avoid the churn.

  A previous attempt was made [1] to address this bug but was reverted
  because it had a side effect [3].  Need a fix that addresses this
  issue without the side-effect.

  [1] https://bugs.launchpad.net/neutron/+bug/1622616/
  [2] https://review.openstack.org/#/c/369051/
  [3] https://bugs.launchpad.net/neutron/+bug/1623800

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