Reviewed:  
https://review.opendev.org/c/openstack/neutron-dynamic-routing/+/882560
Committed: 
https://opendev.org/openstack/neutron-dynamic-routing/commit/06232f0b2c555578bb983c5cefcd8a573761f87a
Submitter: "Zuul (22348)"
Branch:    master

commit 06232f0b2c555578bb983c5cefcd8a573761f87a
Author: Felix Huettner <[email protected]>
Date:   Mon May 8 11:53:55 2023 +0200

    Ignore disabled routers for advertising
    
    currently if a router is set to disabled the dragents still advertise
    the routes. This causes the upstream routers to still know these routes
    and try to forward packets to a non existing router.
    
    By removing these routes we allow these upstream routers do directly
    drop the traffic to these addresses instead of trying to forward it to
    neutron routers.
    
    Closes-Bug: 2018737
    
    Change-Id: Icd6803769f37a04bf7581afb9722c78a44737374


** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/2018737

Title:
  neutron-dynamic-routing announces routes for disabled routers

Status in neutron:
  Fix Released

Bug description:
  neutron routers can be disabled, thereby basically removing them from their 
l3 agents.
  They will no longer accept, process or forward packets once they are disabled.

  Currently if a router is set to disabled the dragents still advertise the 
routes to its networks and floating ips.
  Even though the router is actually not active and can not handle these 
packets.
  This causes the upstream routers to still know these routes and try to 
forward packets to this disabled router.

  For example for internet network this causes unneeded traffic on the upstream 
routers and the network nodes.
  They will receive traffic that they forward to the network node which then 
will drop this traffic as the router is gone.

  It would be ideal if routes for disabled routers are no longer advertised by 
the dragents.
  This would cause upstream routers to loose the routes to these network/fips 
and allow them to drop the traffic as early as possible.

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