@@ -455,13 +455,18 @@ Miscellaneous Tips

 Non-Standard MTU on the Physical Network

 ----------------------------------------

-DevStack defaults to assume that the MTU on the physical network

-is 1500.  A different MTU can be specified by adding the following to

-the `localrc` part of `local.conf` on each machine.

+Neutron by default uses a MTU of 1500 bytes, which is

+the standard MTU for Ethernet.

+

+A different MTU can be specified by adding the following to

+the Neutron section of `local.conf`. For example,

+if you have network equipment that supports jumbo frames, you could

+set the MTU to 9000 bytes by adding the following

 ::

-    Q_ML2_PLUGIN_PATH_MTU=1500

+    [[post-config|/$Q_PLUGIN_CONF_FILE]]

+    global_physnet_mtu = 9000

 Disabling Next Generation Firewall Tools

@@ -40,12 +40,6 @@ Q_ML2_PLUGIN_EXT_DRIVERS=${Q_ML2_PLUGIN_EXT_DRIVERS-port_security}

 # L3 Plugin to load for ML2

 ML2_L3_PLUGIN=${ML2_L3_PLUGIN:-neutron.services.l3_router.l3_router_plugin.L3RouterPlugin}

-# Underlying path MTU for physical network managing br-tun; use '-' instead of

-# ':-' to allow people to explicitly override this to blank, to disable

-# automatic MTU calculation for tunnelled tenant networks

-Q_ML2_PLUGIN_PATH_MTU=${Q_ML2_PLUGIN_PATH_MTU-1500}

-

-

 function populate_ml2_config {

     CONF=$1

     SECTION=$2

@@ -83,12 +77,6 @@ function neutron_plugin_configure_service {

         echo "WARNING - The ml2 plugin is using local tenant networks, with no connectivity between hosts."

     fi

-    # Enable ml2 mtu calculation mechanism for networks by providing path mtu

-    # value for physical devices that are used for br-tun traffic

-    if [[ "$ENABLE_TENANT_TUNNELS" == "True" ]] && [[ "$Q_ML2_PLUGIN_PATH_MTU" != "" ]]; then

-        iniset /$Q_PLUGIN_CONF_FILE ml2 path_mtu "$Q_ML2_PLUGIN_PATH_MTU"

-    fi

-

     # Allow for overrding VLAN configuration (for example, to configure provider

     # VLANs) by first checking if Q_ML2_PLUGIN_VLAN_TYPE_OPTIONS is set.

     if [ "$Q_ML2_PLUGIN_VLAN_TYPE_OPTIONS" == "" ]; then