Bug 1386814

Summary: Raise attention to customers that the use of Linux bridges in Red Hat OpenStack Platform can potentially cause network loops
Product: Red Hat OpenStack Reporter: Andreas Karis <akaris>
Component: documentationAssignee: RHOS Documentation Team <rhos-docs>
Status: CLOSED EOL QA Contact: RHOS Documentation Team <rhos-docs>
Severity: unspecified Docs Contact:
Priority: medium    
Version: 9.0 (Mitaka)CC: bcafarel, dcadzow, kejones, mburns, njohnston, srevivo
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Last Closed: 2019-11-18 16:33:47 UTC Type: Bug
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Description Flags
Failing Templates which use combination of linux_bonds and linux_bridges for LACP
none
Working templates which use ovs_bridges and linux_bonds with LACP mode=4 none

Description Andreas Karis 2016-10-19 16:30:24 UTC 
Lesson Learned: Do not use linux_bridges with linux_bonds for LACP in RHOSP

Result: creates looping in the switches when the nics first come online during deployment causing ports to be shutdown

Recommendation: Documentation should have a note that for LACP configuration, use of Linux Bridges will cause this looping behavior

There is a note about the problems caused by using ovs_bonds with LACP, but it doesn't talk about what to do with the bridges (ovs or linux)?


https://access.redhat.com/documentation/en/red-hat-openstack-platform/9/single/networking-guide/#configure_lacp_port_aggregation

Step 2 has a mention to OVS Bridge, but that's the only place I see it.

I would think it would be good to add a note in this section about not using linux_bridges because it creates loops on the switches when the nics come online
https://access.redhat.com/documentation/en/red-hat-openstack-platform/9/single/director-installation-and-usage/#appe-Bonding_Options
Comment 3 Kevin Jones 2016-10-19 18:09:54 UTC 
Created attachment 1212236 [details]
Failing Templates which use combination of linux_bonds and linux_bridges for LACP
Comment 4 Kevin Jones 2016-10-19 18:10:45 UTC 
Created attachment 1212237 [details]
Working templates which use ovs_bridges and linux_bonds with LACP mode=4
Comment 8 Bernard Cafarelli 2019-11-18 16:33:47 UTC 
After some discussion and link checking, I am closing this bug, as OSP 9 is EOL and 10 has explicit configuration section for bonding options:
https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/10/html/advanced_overcloud_customization/appe-bonding_options