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OSDOCS-13187:Manually setting the MTU value #93116

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OSDOCS-13187:Manually setting the MTU value #93116

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6 changes: 6 additions & 0 deletions modules/microshift-nw-topology.adoc
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Expand Up @@ -9,6 +9,12 @@ OVN-Kubernetes provides an overlay-based networking implementation. This overlay

To configure the MTU, you must set an equal-to or less-than value than the MTU of the physical interface on the host. A less-than value for the MTU makes room for the required information that is added to the tunnel header before it is transmitted.

[IMPORTANT]

====
The MTU value of the OVN overlay networking in {microshift-short} must be 100 bytes smaller than the MTU value of the base network. If no MTU value is configured, {microshift-short} autoconfigures the value using the MTU value of the default gateway (IPV4 or V6) of the host. If the auto-configuration does not work correctly, the MTU value can be configured manually. For example, if the MTU value of the network is `9000`, the OVN MTU size must be set to `8900`.
====

OVS runs as a systemd service on the {microshift-short} node. The OVS RPM package is installed as a dependency to the `microshift-networking` RPM package. OVS is started immediately when the `microshift-networking` RPM is installed.

.{product-title} network topology
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