diff --git a/of-save/ctl/src/main/java/net/onrc/onos/of/ctl/IOFSwitch.java b/of-save/ctl/src/main/java/net/onrc/onos/of/ctl/IOFSwitch.java
new file mode 100644
index 0000000..8015f3f
--- /dev/null
+++ b/of-save/ctl/src/main/java/net/onrc/onos/of/ctl/IOFSwitch.java
@@ -0,0 +1,582 @@
+/**
+ *    Copyright 2011, Big Switch Networks, Inc.
+ *    Originally created by David Erickson, Stanford University
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *    not use this file except in compliance with the License. You may obtain
+ *    a copy of the License at
+ *
+ *         http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ *    License for the specific language governing permissions and limitations
+ *    under the License.
+ **/
+
+package net.onrc.onos.of.ctl;
+
+import java.io.IOException;
+import java.util.Collection;
+import java.util.Date;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.Future;
+
+import net.onrc.onos.of.ctl.debugcounter.IDebugCounterService;
+import net.onrc.onos.of.ctl.debugcounter.IDebugCounterService.CounterException;
+import net.onrc.onos.of.ctl.util.OrderedCollection;
+
+import org.jboss.netty.channel.Channel;
+import org.projectfloodlight.openflow.protocol.OFActionType;
+import org.projectfloodlight.openflow.protocol.OFCapabilities;
+import org.projectfloodlight.openflow.protocol.OFDescStatsReply;
+import org.projectfloodlight.openflow.protocol.OFFeaturesReply;
+import org.projectfloodlight.openflow.protocol.OFMessage;
+import org.projectfloodlight.openflow.protocol.OFPortDesc;
+import org.projectfloodlight.openflow.protocol.OFPortDescStatsReply;
+import org.projectfloodlight.openflow.protocol.OFPortStatus;
+import org.projectfloodlight.openflow.protocol.OFStatsReply;
+import org.projectfloodlight.openflow.protocol.OFStatsRequest;
+import org.projectfloodlight.openflow.protocol.OFVersion;
+import org.projectfloodlight.openflow.types.U64;
+
+
+public interface IOFSwitch {
+
+    /**
+     * OF1.3 switches should support role-request messages as in the 1.3 spec.
+     * OF1.0 switches may or may not support the Nicira role request extensions.
+     * To indicate the support, this property should be set by the associated
+     * OF1.0 switch driver in the net.onrc.onos.core.drivermanager package.
+     * The property will be ignored for OF1.3 switches.
+     */
+    public static final String SWITCH_SUPPORTS_NX_ROLE = "supportsNxRole";
+
+
+    //************************
+    // Channel related
+    //************************
+
+    /**
+     * Disconnects the switch by closing the TCP connection. Results in a call
+     * to the channel handler's channelDisconnected method for cleanup
+     * @throws IOException
+     */
+    public void disconnectSwitch();
+
+    /**
+     * Writes to the OFMessage to the output stream.
+     *
+     * @param m
+     * @param bc
+     * @throws IOException
+     */
+    public void write(OFMessage m) throws IOException;
+
+    /**
+     * Writes the list of messages to the output stream.
+     *
+     * @param msglist
+     * @param bc
+     * @throws IOException
+     */
+    public void write(List<OFMessage> msglist) throws IOException;
+
+    /**
+     * Gets the date the switch connected to this controller.
+     *
+     * @return the date
+     */
+    public Date getConnectedSince();
+
+    /**
+     * Gets the next available transaction id.
+     *
+     * @return the next transaction ID
+     */
+    public int getNextTransactionId();
+
+    /**
+     * Checks if the switch is still connected.
+     * Only call while holding processMessageLock
+     *
+     * @return whether the switch is still disconnected
+     */
+    public boolean isConnected();
+
+    /**
+     * Sets whether the switch is connected.
+     * Only call while holding modifySwitchLock
+     *
+     * @param connected whether the switch is connected
+     */
+    public void setConnected(boolean connected);
+
+    /**
+     * Flushes all flows queued for this switch in the current thread.
+     * NOTE: The contract is limited to the current thread
+     */
+    public void flush();
+
+    /**
+     * Sets the Netty Channel this switch instance is associated with.
+     * <p>
+     * Called immediately after instantiation
+     *
+     * @param channel the channel
+     */
+    public void setChannel(Channel channel);
+
+    //************************
+    // Switch features related
+    //************************
+
+    /**
+     * Gets the datapathId of the switch.
+     *
+     * @return the switch buffers
+     */
+    public long getId();
+
+    /**
+     * Gets a string version of the ID for this switch.
+     *
+     * @return string version of the ID
+     */
+    public String getStringId();
+
+    /**
+     * Gets the number of buffers.
+     *
+     * @return the number of buffers
+     */
+    public int getNumBuffers();
+
+    public Set<OFCapabilities> getCapabilities();
+
+    public byte getNumTables();
+
+    /**
+     * Returns an OFDescStatsReply message object. Use the methods contained
+     * to retrieve switch descriptions for Manufacturer, Hw/Sw version etc.
+     */
+    public OFDescStatsReply getSwitchDescription();
+
+    /**
+     * Cancel features reply with a specific transaction ID.
+     * @param transactionId the transaction ID
+     */
+    public void cancelFeaturesReply(int transactionId);
+
+    /**
+     * Gets the OFActionType set.
+     * <p>
+     * getActions has relevance only for an OpenFlow 1.0 switch.
+     * For OF1.3, each table can support different actions
+     *
+     * @return the action set
+     */
+    public Set<OFActionType> getActions();
+
+    public void setOFVersion(OFVersion ofv);
+
+    public OFVersion getOFVersion();
+
+
+    //************************
+    //  Switch port related
+    //************************
+
+    /**
+     * the type of change that happened to an open flow port.
+     */
+    public enum PortChangeType {
+        /** Either a new port has been added by the switch, or we are
+         * adding a port we just deleted (via a prior notification) due to
+         * a change in the portNumber-portName mapping.
+         */
+        ADD,
+        /** some other feature of the port has changed (eg. speed)*/
+        OTHER_UPDATE,
+        /** Either a port has been deleted by the switch, or we are deleting
+         * a port whose portNumber-portName mapping has changed. Note that in
+         * the latter case, a subsequent notification will be sent out to add a
+         * port with the new portNumber-portName mapping.
+         */
+        DELETE,
+        /** Port is up (i.e. enabled). Presumably an earlier notification had
+         * indicated that it was down. To be UP implies that the port is
+         * administratively considered UP (see ofp_port_config) AND the port
+         * link is up AND the port is no longer blocked (see ofp_port_state).
+         */
+        UP,
+        /** Port is down (i.e. disabled). Presumably an earlier notification had
+         * indicated that it was up, or the port was always up.
+         * To be DOWN implies that the port has been either
+         * administratively brought down (see ofp_port_config) OR the port
+         * link is down OR the port is blocked (see ofp_port_state).
+         */
+        DOWN,
+    }
+
+    /**
+     * Describes a change of an open flow port.
+     */
+    public static class PortChangeEvent {
+        public final OFPortDesc port;
+        public final PortChangeType type;
+        /**
+         * @param port
+         * @param type
+         */
+        public PortChangeEvent(OFPortDesc port,
+                               PortChangeType type) {
+            this.port = port;
+            this.type = type;
+        }
+        /* (non-Javadoc)
+         * @see java.lang.Object#hashCode()
+         */
+        @Override
+        public int hashCode() {
+            final int prime = 31;
+            int result = 1;
+            result = prime * result + ((port == null) ? 0 : port.hashCode());
+            result = prime * result + ((type == null) ? 0 : type.hashCode());
+            return result;
+        }
+        /* (non-Javadoc)
+         * @see java.lang.Object#equals(java.lang.Object)
+         */
+        @Override
+        public boolean equals(Object obj) {
+            if (this == obj) {
+                return true;
+            }
+            if (obj == null) {
+                return false;
+            }
+            if (getClass() != obj.getClass()) {
+                return false;
+            }
+            PortChangeEvent other = (PortChangeEvent) obj;
+            if (port == null) {
+                if (other.port != null) {
+                    return false;
+                }
+            } else if (!port.equals(other.port)) {
+                return false;
+            }
+            if (type != other.type) {
+                return false;
+            }
+            return true;
+        }
+        /* (non-Javadoc)
+         * @see java.lang.Object#toString()
+         */
+        @Override
+        public String toString() {
+            return "[" + type + " " + port.toString() + "]";
+        }
+    }
+
+
+    /**
+     * Get list of all enabled ports. This will typically be different from
+     * the list of ports in the OFFeaturesReply, since that one is a static
+     * snapshot of the ports at the time the switch connected to the controller
+     * whereas this port list also reflects the port status messages that have
+     * been received.
+     *
+     * @return Unmodifiable list of ports not backed by the underlying collection
+     */
+    public Collection<OFPortDesc> getEnabledPorts();
+
+    /**
+     * Get list of the port numbers of all enabled ports. This will typically
+     * be different from the list of ports in the OFFeaturesReply, since that
+     * one is a static snapshot of the ports at the time the switch connected
+     * to the controller whereas this port list also reflects the port status
+     * messages that have been received.
+     *
+     * @return Unmodifiable list of ports not backed by the underlying collection
+     */
+    public Collection<Integer> getEnabledPortNumbers();
+
+    /**
+     * Retrieve the port object by the port number. The port object
+     * is the one that reflects the port status updates that have been
+     * received, not the one from the features reply.
+     *
+     * @param portNumber
+     * @return port object
+     */
+    public OFPortDesc getPort(int portNumber);
+
+    /**
+     * Retrieve the port object by the port name. The port object
+     * is the one that reflects the port status updates that have been
+     * received, not the one from the features reply.
+     *
+     * @param portName
+     * @return port object
+     */
+    public OFPortDesc getPort(String portName);
+
+    /**
+     * Add or modify a switch port. This is called by the core controller
+     * code in response to a OFPortStatus message.
+     *
+     * OFPPR_MODIFY and OFPPR_ADD will be treated as equivalent. The OpenFlow
+     * spec is not clear on whether portNames are portNumbers are considered
+     * authoritative identifiers. We treat portNames <-> portNumber mappings
+     * as fixed. If they change, we delete all previous conflicting ports and
+     * add all new ports.
+     *
+     * @param ps the port status message
+     * @return the ordered Collection of changes "applied" to the old ports
+     * of the switch according to the PortStatus message. A single PortStatus
+     * message can result in multiple changes.
+     * If portName <-> portNumber mappings have
+     * changed, the iteration order ensures that delete events for old
+     * conflicting appear before before events adding new ports
+     */
+    public OrderedCollection<PortChangeEvent> processOFPortStatus(OFPortStatus ps);
+
+    /**
+     * Get list of all ports. This will typically be different from
+     * the list of ports in the OFFeaturesReply, since that one is a static
+     * snapshot of the ports at the time the switch connected to the controller
+     * whereas this port list also reflects the port status messages that have
+     * been received.
+     *
+     * @return Unmodifiable list of ports
+     */
+    public Collection<OFPortDesc> getPorts();
+
+    /**
+     * @param portName
+     * @return Whether a port is enabled per latest port status message
+     * (not configured down nor link down nor in spanning tree blocking state)
+     */
+    public boolean portEnabled(int portName);
+
+    /**
+     * @param portNumber
+     * @return Whether a port is enabled per latest port status message
+     * (not configured down nor link down nor in spanning tree blocking state)
+     */
+    public boolean portEnabled(String portName);
+
+    /**
+     * Compute the changes that would be required to replace the old ports
+     * of this switch with the new ports.
+     * @param ports new ports to set
+     * @return the ordered collection of changes "applied" to the old ports
+     * of the switch in order to set them to the new set.
+     * If portName <-> portNumber mappings have
+     * changed, the iteration order ensures that delete events for old
+     * conflicting appear before before events adding new ports
+     */
+    public OrderedCollection<PortChangeEvent>
+            comparePorts(Collection<OFPortDesc> ports);
+
+    /**
+     * Replace the ports of this switch with the given ports.
+     * @param ports new ports to set
+     * @return the ordered collection of changes "applied" to the old ports
+     * of the switch in order to set them to the new set.
+     * If portName <-> portNumber mappings have
+     * changed, the iteration order ensures that delete events for old
+     * conflicting appear before before events adding new ports
+     */
+    public OrderedCollection<PortChangeEvent>
+            setPorts(Collection<OFPortDesc> ports);
+
+    //*******************************************
+    //  IOFSwitch object attributes
+    //************************
+
+    /**
+     * Gets attributes of this switch.
+     *
+     * @return attributes of the switch
+     */
+    public Map<Object, Object> getAttributes();
+
+    /**
+     * Checks if a specific switch property exists for this switch.
+     *
+     * @param name name of property
+     * @return value for name
+     */
+    boolean hasAttribute(String name);
+
+    /**
+     * Gets properties for switch specific behavior.
+     *
+     * @param name name of property
+     * @return 'value' for 'name', or null if no entry for 'name' exists
+     */
+    Object getAttribute(String name);
+
+    /**
+     * Sets properties for switch specific behavior.
+     *
+     * @param name  name of property
+     * @param value value for name
+     */
+    void setAttribute(String name, Object value);
+
+    /**
+     * Removes properties for switch specific behavior.
+     *
+     * @param name name of property
+     * @return current value for name or null (if not present)
+     */
+    Object removeAttribute(String name);
+
+    //************************
+    //  Switch statistics
+    //************************
+
+    /**
+     * Delivers the statistics future reply.
+     *
+     * @param reply the reply to deliver
+     */
+    public void deliverStatisticsReply(OFMessage reply);
+
+    /**
+     * Cancels the statistics reply with the given transaction ID.
+     *
+     * @param transactionId the transaction ID
+     */
+    public void cancelStatisticsReply(int transactionId);
+
+    /**
+     * Cancels all statistics replies.
+     */
+    public void cancelAllStatisticsReplies();
+
+    /**
+     * Gets a Future object that can be used to retrieve the asynchronous.
+     * OFStatisticsReply when it is available.
+     *
+     * @param request statistics request
+     * @return Future object wrapping OFStatisticsReply
+     * @throws IOException
+     */
+    public Future<List<OFStatsReply>> getStatistics(OFStatsRequest<?> request)
+            throws IOException;
+
+    //************************
+    //  Switch other utilities
+    //************************
+
+    /**
+     * Clears all flowmods on this switch.
+     */
+    public void clearAllFlowMods();
+
+    /**
+     * Gets the current role of this controller for this IOFSwitch.
+     */
+    public Role getRole();
+
+    /**
+     * Sets this controller's Role for this IOFSwitch to role.
+     *
+     * @param role
+     */
+    public void setRole(Role role);
+
+    /**
+     * Gets the next generation ID.
+     * <p>
+     * Note: relevant for role request messages in OF1.3
+     *
+     * @return next generation ID
+     */
+    public U64 getNextGenerationId();
+
+
+    /**
+     * Set debug counter service for per-switch counters.
+     * Called immediately after instantiation.
+     * @param debugCounters
+     * @throws CounterException
+     */
+    public void setDebugCounterService(IDebugCounterService debugCounter)
+            throws CounterException;
+
+    /**
+     * Start this switch driver's sub handshake. This might be a no-op but
+     * this method must be called at least once for the switch to be become
+     * ready.
+     * This method must only be called from the I/O thread
+     * @throws IOException
+     * @throws SwitchDriverSubHandshakeAlreadyStarted if the sub-handshake has
+     * already been started
+     */
+    public void startDriverHandshake() throws IOException;
+
+    /**
+     * Check if the sub-handshake for this switch driver has been completed.
+     * This method can only be called after startDriverHandshake()
+     *
+     * This methods must only be called from the I/O thread
+     * @return true if the sub-handshake has been completed. False otherwise
+     * @throws SwitchDriverSubHandshakeNotStarted if startDriverHandshake() has
+     * not been called yet.
+     */
+    public boolean isDriverHandshakeComplete();
+
+    /**
+     * Pass the given OFMessage to the driver as part of this driver's
+     * sub-handshake. Must not be called after the handshake has been completed
+     * This methods must only be called from the I/O thread
+     * @param m The message that the driver should process
+     * @throws SwitchDriverSubHandshakeCompleted if isDriverHandshake() returns
+     * false before this method call
+     * @throws SwitchDriverSubHandshakeNotStarted if startDriverHandshake() has
+     * not been called yet.
+     */
+    public void processDriverHandshakeMessage(OFMessage m);
+
+    /**
+     * Set the flow table full flag in the switch.
+     * XXX S Rethink this for multiple tables
+     */
+    public void setTableFull(boolean isFull);
+
+    /**
+     * Save the features reply for this switch.
+     *
+     * @param featuresReply
+     */
+    public void setFeaturesReply(OFFeaturesReply featuresReply);
+
+    /**
+     * Save the portset for this switch.
+     *
+     * @param portDescReply
+     */
+    public void setPortDescReply(OFPortDescStatsReply portDescReply);
+
+    //************************
+    //  Message handling
+    //************************
+    /**
+     * Handle the message coming from the dataplane.
+     *
+     * @param m the actual message
+     */
+    public void handleMessage(OFMessage m);
+
+
+}