Bug 2231273

Summary:	[RFE] Request to support OVN L3 HA when external network failure.
Product:	Red Hat OpenStack	Reporter:	youngcheol <yocha>
Component:	python-networking-ovn	Assignee:	Miro Tomaska <mtomaska>
Status:	NEW ---	QA Contact:	Eran Kuris <ekuris>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	16.2 (Train)	CC:	apevec, fyanac, lhh, majopela, mlavalle, scohen
Target Milestone:	---	Keywords:	FutureFeature
Target Release:	---	Flags:	mtomaska: needinfo? (yocha)
Hardware:	Unspecified
OS:	Unspecified
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Fixed In Version:		Doc Type:	If docs needed, set a value
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Last Closed:		Type:	Bug
Regression:	---	Mount Type:	---
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description youngcheol 2023-08-11 08:06:21 UTC

Description of problem:

OVN Layer 3 high availability can not detect External network failures.
but there is a request to make it work and automatically HA.


https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/16.2/html/networking_guide/assembly_work-with-ovn_rhosp-network#l3-ha-ovn_work-ovn
Note: 
  External network failures are not detected as would happen with an ML2-OVS configuration.
  
L3 HA for OVN supports the following failure modes:
  - The gateway node becomes disconnected from the network (tunneling interface).
  - ovs-vswitchd stops (ovs-switchd is responsible for BFD signaling)
  - ovn-controller stops (ovn-controller removes itself as a registered node).
  
  
  

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Comment 2 Miro Tomaska 2023-08-22 20:43:46 UTC

Hi YoungCheol,

I have looked into the documentation you linked and I am not sure where the Note comes from. As far as I can tell, ML2/OVS backend also does not have ability to detect issues on the external(to openstack) network.
Is this documentation Note the only source you have indicating that ML2/OVS has such capability? I can work with documentation to have that fixed. Thank you