Note: This bug is displayed in read-only format because the product is no longer active in Red Hat Bugzilla.

Bug 1396481

Summary:	Unable to set global_physnet_mtu
Product:	Red Hat OpenStack	Reporter:	Jakub Libosvar <jlibosva>
Component:	openstack-neutron	Assignee:	Brent Eagles <beagles>
Status:	CLOSED WONTFIX	QA Contact:	Toni Freger <tfreger>
Severity:	medium	Docs Contact:
Priority:	low
Version:	8.0 (Liberty)	CC:	abregman, amuller, beagles, chrisw, nyechiel, srevivo, tfreger
Target Milestone:	async	Keywords:	Triaged, ZStream
Target Release:	8.0 (Liberty)
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:	1393351	Environment:
Last Closed:	2018-07-17 14:23:11 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:
Bug Depends On:	1393351
Bug Blocks:	1386319, 1394845

Comment 1 Arie Bregman 2016-11-22 12:56:25 UTC

TripleO (OSP < 10) allows you to specify 'NeutronTenantMtu' which sets path_mtu in neutron.conf, but that applies only for tunneled networks.

We need the 'NeutronGlobalPhysnetMtu' which introduced in OSP 10, to allow setting the MTU for flat and vlan networks (global_physnet_mtu).

Comment 2 Brent Eagles 2016-11-22 14:09:56 UTC

My patch that undid some of the tangled mess with regards to dhcp options would have been better off leaving the hieradata setting alone. It was either already directed to global_physnet_mtu at that point or was changed later

Comment 3 Assaf Muller 2016-12-19 13:16:01 UTC

Is this relevant still for OSP 8?

Comment 5 Brent Eagles 2017-02-08 19:50:28 UTC

Unless I am missing something, OSP 8 doesn't actually have global_physnet_mtu so ultimately we need a mechanism which produces similar results. FWICT that is segment_mtu? What's the actual impact/use of network_device_mtu in that release? I'm guessing it should be labelled "considered harmful".

Comment 7 Assaf Muller 2018-07-17 14:23:11 UTC

Director sets up MTU correctly on OSP 10+, we are not able to fix this in older versions due to where the branches are in their lifecycle and our own team's Engineering capacity.