Back to bug 1836998
| Who | When | What | Removed | Added |
|---|---|---|---|---|
| James Smith | 2020-05-19 16:26:20 UTC | CC | jamsmith | |
| Doc Text | Because of a core OVN bug, virtual machines with floating IP (FIP) addresses cannot route to other networks in an ML2/OVN deployment with distributed virtual routing (DVR) enabled. Core OVN sets a bad next hop when routing SNAT IPv4 traffic from a VM with a floating ip with DVR enabled. Instead of the gateway IP, OVN sets the destination IP. As a result, the router sends an ARP request for outer unknown IP instead of routing it to the gateway. + Before deploying a new overcloud with ML2/OVN, disable DVR by setting `NeutronEnableDVR: false` in an environment file. + If you have ML2/OVN in an existing deployment, perform the following steps: + . Set the enable_distributed_floating_ip parameter in the [ovs] section of neutron.conf to False . Update the floating ip that requires external SNAT to work via Neutron API (e.g. by changing its description) + NOTE: Disabling DVR causes traffic to be centralized. All L3 traffic will go through the controller/network nodes. This may have an impact on scale, data plane performance and throughput. | |||
| Doc Type | If docs needed, set a value | Known Issue | ||
| James Smith | 2020-05-19 19:32:24 UTC | Doc Text | Because of a core OVN bug, virtual machines with floating IP (FIP) addresses cannot route to other networks in an ML2/OVN deployment with distributed virtual routing (DVR) enabled. Core OVN sets a bad next hop when routing SNAT IPv4 traffic from a VM with a floating ip with DVR enabled. Instead of the gateway IP, OVN sets the destination IP. As a result, the router sends an ARP request for outer unknown IP instead of routing it to the gateway. + Before deploying a new overcloud with ML2/OVN, disable DVR by setting `NeutronEnableDVR: false` in an environment file. + If you have ML2/OVN in an existing deployment, perform the following steps: + . Set the enable_distributed_floating_ip parameter in the [ovs] section of neutron.conf to False . Update the floating ip that requires external SNAT to work via Neutron API (e.g. by changing its description) + NOTE: Disabling DVR causes traffic to be centralized. All L3 traffic will go through the controller/network nodes. This may have an impact on scale, data plane performance and throughput. | Because of a core OVN bug, virtual machines with floating IP (FIP) addresses cannot route to other networks in an ML2/OVN deployment with distributed virtual routing (DVR) enabled. Core OVN sets a bad next hop when routing SNAT IPv4 traffic from a VM with a floating ip with DVR enabled. Instead of the gateway IP, OVN sets the destination IP. As a result, the router sends an ARP request for an unknown IP instead of routing it to the gateway. + Before deploying a new overcloud with ML2/OVN, disable DVR by setting `NeutronEnableDVR: false` in an environment file. + If you have ML2/OVN in an existing deployment, perform the following steps: + . Set the `enable_distributed_floating_ip parameter` in the [ovs] section of neutron.conf to False. You should also set `NeutronEnableDVR: false` in an environment file used in any re-deployments so that the next re-deployment does not re-enable DVR. . Update the floating IP that requires external SNAT to work through the Neutron API (for example, by changing its description). + NOTE: Disabling DVR causes traffic to be centralized. All L3 traffic goes through the controller/network nodes. This may affect scale, data plane performance, and throughput. |
| lorenzo bianconi | 2020-05-27 10:15:39 UTC | Depends On | 1840605 | |
| lorenzo bianconi | 2020-05-31 22:19:37 UTC | Depends On | 1836976 | |
| Jakub Libosvar | 2021-03-05 12:09:09 UTC | Assignee | amuller | rhos-maint |
| Assaf Muller | 2021-06-15 17:25:05 UTC | CC | amuller | |
| Lon Hohberger | 2021-07-09 16:28:33 UTC | Assignee | rhos-maint | rhos-maint |
| Red Hat One Jira (issues.redhat.com) | 2022-03-24 14:07:32 UTC | Link ID | Red Hat Issue Tracker OSP-5208 | |
| Eran Kuris | 2023-07-18 10:44:23 UTC | Status | NEW | CLOSED |
| Resolution | --- | WONTFIX | ||
| Last Closed | 2023-07-18 10:44:23 UTC |
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