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Bug 2232380

Summary:	OVN router policies do not support ecmp symmetric reply
Product:	Red Hat Enterprise Linux Fast Datapath	Reporter:	Dumitru Ceara <dceara>
Component:	ovn23.09	Assignee:	OVN Team <ovnteam>
Status:	CLOSED NEXTRELEASE	QA Contact:	Jianlin Shi <jishi>
Severity:	unspecified	Docs Contact:
Priority:	medium
Version:	FDP 23.J	CC:	ctrautma, i.maximets, jiji, mmichels, pdiak, pepalani, surya
Target Milestone:	---	Keywords:	FutureFeature
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Enhancement
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2024-02-14 21:16:13 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Dumitru Ceara 2023-08-16 14:55:29 UTC

Description of problem:

OVN gateway routers support "ecmp_symmetric_reply" behavior for ecmp static routes since v20.09.0 (https://github.com/ovn-org/ovn/commit/4fdca656857d4a5caeec35ae813888cb9e403e5e)

However, the routing decision can be overridden through re-route logical router policies.  These, in turn, support specifying multiple next-hops (ECMP) since v21.03.0 (https://github.com/ovn-org/ovn/commit/35b00c7e79900787e510bb203c5cddfb895f6c4f).

It's desirable that router policies also support the "ecmp_symmetric_reply" semantics, in order to allow reply traffic to always be sent out on the same path on which the initiating traffic was received.

This behavior should be on-demand, opt-in, configurable through a new Logical_Router_Policy option, e.g. "ecmp_symmetric_reply".

Comment 1 OVN Bot 2024-02-14 21:16:11 UTC

This issue is being closed as an automatic process due to the issue's age. If you wish to re-open this issue, please do so in Jira (https://issues.redhat.com) in the 'FDP' project. Please be sure to set the component to the latest OVN version where this issue is known to occur. If this is a feature request or improvement, please set the component to 'OVN'.

Comment 2 Ilya Maximets 2024-02-15 14:31:30 UTC

FWIW, this issue was addressed as part of https://issues.redhat.com/browse/FDP-42 .