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Bug 2308346

Summary:	[17.1][BGP]Outage when frr is restarted in OSP nodes
Product:	Red Hat OpenStack	Reporter:	Luca Miccini <lmiccini>
Component:	ovn-bgp-agent	Assignee:	OSP Team <rhos-maint>
Status:	CLOSED MIGRATED	QA Contact:	Candido Campos <ccamposr>
Severity:	high	Docs Contact:
Priority:	high
Version:	17.1 (Wallaby)	CC:	ccamposr, dalvarez, gregraka, jlibosva, lmartins, lmiccini, rhos-maint
Target Milestone:	z4	Keywords:	Triaged
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Known Issue
Doc Text:	In RHOSP 17.1 dynamic routing environments, restarting the Free Range Routing (FRR) container can cause unexpected network disruption. This disruption occurs because during a restart, some OVN BGP agent and FRR configurations erroneously delete the routes for transferring networking packets and the configurations must re-learn these routes. + Workaround: . Ensure that you have configured your leaf nodes with the graceful restart options. + For more information, see link:https://docs.redhat.com/en/documentation/red_hat_openstack_platform/17.1/html/configuring_dynamic_routing_in_red_hat_openstack_platform/deploy-overcloud-rhosp-dynamic-routing_rhosp-bgp#proc_config-leaf-networks_deploy-overcloud[Configuring the leaf networks] in _Configuring dynamic routing in Red Hat OpenStack Platform_. . Restart the `ovn-bgp-agent` container immediately after restarting the `frr` container, and wait for the agent to synchronize after it reloads its new configuration that include the graceful restart options.	Story Points:	---
Clone Of:	2290396	Environment:
Last Closed:	2024-12-10 23:01:20 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2290396
Bug Blocks:

Description Luca Miccini 2024-08-28 14:58:57 UTC

+++ This bug was initially created as a clone of Bug #2290396 +++

Description of problem:
When frr is restarted the frr dynamic config is deleted and not recovered until sync process reload it

Workaround:

restart ovn-bgp-agent just after frr restart.