openvswitch: functionality sanity test

Instructions for creating a simple bridge that will take
over eth0.  You cannot be executing out of an nfs-mounted
filesystem while setting up the bridge.

Signed-off-by: Joe Slater <jslater@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>

docs/vswitch_test.sh

@@ -0,0 +1,36 @@
+#!/bin/sh
+
+# runqemu defaults for the first "guest"
+#
+my_inet4="192.168.7.2"
+my_gw="192.168.7.1"
+
+# create a bridge
+#
+ovs-vsctl add-br br-int
+
+# Add a physical interface to your virtual bridge for connectivity off box.
+# If your rootfs is nfs mounted (on eth0), you will die after attaching it
+# to the bridge.
+#
+ovs-vsctl add-port br-int eth0
+
+# Zero out your eth0 interface and slap it on the bridge interface.
+#
+ifconfig eth0 0
+ifconfig br-int ${my_inet4} netmask 255.255.255.0
+
+# Change your default route.  If you don't do this, nothing will
+# be reachable.
+#
+route add default gw ${my_gw} br-int
+
+(You can then check that the connection works.)
+
+# The bridge configuration is persistant, so if something goes wrong
+# and you reboot, it will still be messed up.  Destroy the bridge,
+# then add a route, or reboot.
+#
+ovs-vsctl del-br br-int
+ifconfig eth0 ${my_inet4}
+route add default gw ${my_gw} eth0