diff --git a/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectCodec.java b/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectCodec.java
index 08558a8..1154e40 100644
--- a/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectCodec.java
+++ b/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectCodec.java
@@ -28,10 +28,13 @@
 
 import java.util.Set;
 
+/**
+ * Codec for Xconnect.
+ */
 public class XconnectCodec extends JsonCodec<XconnectDesc> {
     private static final String DEVICE_ID = "deviceId";
     private static final String VLAN_ID = "vlanId";
-    private static final String PORTS = "ports";
+    private static final String ENDPOINTS = "endpoints";
 
     private static Logger log = LoggerFactory.getLogger(XconnectCodec.class);
 
@@ -40,8 +43,8 @@
         final ObjectNode result = context.mapper().createObjectNode();
         result.put(DEVICE_ID, desc.key().deviceId().toString());
         result.put(VLAN_ID, desc.key().vlanId().toString());
-        final ArrayNode portNode = result.putArray(PORTS);
-        desc.ports().forEach(port -> portNode.add(port.toString()));
+        final ArrayNode portNode = result.putArray(ENDPOINTS);
+        desc.endpoints().forEach(endpoint -> portNode.add(endpoint.toString()));
 
         return result;
     }
@@ -51,13 +54,14 @@
         DeviceId deviceId = DeviceId.deviceId(json.path(DEVICE_ID).asText());
         VlanId vlanId = VlanId.vlanId(json.path(VLAN_ID).asText());
 
-        Set<String> ports = Sets.newHashSet();
-        JsonNode portNodes = json.get(PORTS);
-        if (portNodes != null) {
-            portNodes.forEach(portNode -> ports.add(portNode.asText()));
+        Set<XconnectEndpoint> endpoints = Sets.newHashSet();
+        JsonNode endpointNodes = json.get(ENDPOINTS);
+        if (endpointNodes != null) {
+            XconnectEndpoint endpoint = XconnectEndpoint.fromString(endpointNodes.asText());
+            endpointNodes.forEach(endpointNode -> endpoints.add(endpoint));
         }
 
         XconnectKey key = new XconnectKey(deviceId, vlanId);
-        return new XconnectDesc(key, ports);
+        return new XconnectDesc(key, endpoints);
     }
 }
diff --git a/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectDesc.java b/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectDesc.java
index e94c1db..1e7a3b2 100644
--- a/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectDesc.java
+++ b/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectDesc.java
@@ -25,17 +25,17 @@
  */
 public class XconnectDesc {
     private XconnectKey key;
-    private Set<String> ports;
+    private Set<XconnectEndpoint> endpoints;
 
     /**
      * Constructs new Xconnect description with given device ID and VLAN ID.
      *
      * @param key Xconnect key
-     * @param ports set of ports
+     * @param endpoints set of endpoints
      */
-    public XconnectDesc(XconnectKey key, Set<String> ports) {
+    public XconnectDesc(XconnectKey key, Set<XconnectEndpoint> endpoints) {
         this.key = key;
-        this.ports = ports;
+        this.endpoints = endpoints;
     }
 
     /**
@@ -48,12 +48,12 @@
     }
 
     /**
-     * Gets ports.
+     * Gets endpoints.
      *
-     * @return set of ports
+     * @return set of endpoints
      */
-    public Set<String> ports() {
-        return ports;
+    public Set<XconnectEndpoint> endpoints() {
+        return endpoints;
     }
 
     @Override
@@ -69,19 +69,19 @@
         }
         final XconnectDesc other = (XconnectDesc) obj;
         return Objects.equals(this.key, other.key) &&
-                Objects.equals(this.ports, other.ports);
+                Objects.equals(this.endpoints, other.endpoints);
     }
 
     @Override
     public int hashCode() {
-        return Objects.hash(key, ports);
+        return Objects.hash(key, endpoints);
     }
 
     @Override
     public String toString() {
         return MoreObjects.toStringHelper(getClass())
                 .add("key", key)
-                .add("ports", ports)
+                .add("endpoints", endpoints)
                 .toString();
     }
 }
diff --git a/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectEndpoint.java b/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectEndpoint.java
new file mode 100644
index 0000000..c7a2242
--- /dev/null
+++ b/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectEndpoint.java
@@ -0,0 +1,64 @@
+/*
+ * Copyright 2019-present Open Networking Foundation
+ *
+ * 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 org.onosproject.segmentrouting.xconnect.api;
+
+/**
+ * Represents cross connect endpoint.
+ */
+public abstract class XconnectEndpoint {
+    public static final String LB_KEYWORD = "LB:";
+    static final String PORT_PATTERN = "^\\d+$";
+    static final String LOAD_BALANCER_PATTERN = "^" + LB_KEYWORD + "\\d+$";
+
+    /**
+     * Types of endpoint.
+     */
+    public enum Type {
+        /**
+         * The endpoint is specified by an port number.
+         */
+        PORT,
+
+        /**
+         * The endpoint is specified by a load balancer.
+         */
+        LOAD_BALANCER
+    }
+
+    /**
+     * Type of this endpoint.
+     *
+     * @return type
+     */
+    public abstract XconnectEndpoint.Type type();
+
+    /**
+     * Constructs XconnectEndpoint from string.
+     *
+     * @param s string
+     * @return XconnectEndpoint
+     * @throws IllegalArgumentException if given string is in a wrong format
+     */
+    public static XconnectEndpoint fromString(String s) {
+        if (s.matches(XconnectEndpoint.PORT_PATTERN)) {
+            return XconnectPortEndpoint.fromString(s);
+        } else if (s.matches(XconnectEndpoint.LOAD_BALANCER_PATTERN)) {
+            return XconnectLoadBalancerEndpoint.fromString(s);
+        } else {
+            throw new IllegalArgumentException("Illegal endpoint format: " + s);
+        }
+    }
+}
diff --git a/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectLoadBalancerEndpoint.java b/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectLoadBalancerEndpoint.java
new file mode 100644
index 0000000..4172292
--- /dev/null
+++ b/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectLoadBalancerEndpoint.java
@@ -0,0 +1,88 @@
+/*
+ * Copyright 2019-present Open Networking Foundation
+ *
+ * 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 org.onosproject.segmentrouting.xconnect.api;
+
+import java.util.Objects;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+/**
+ * Represents a cross connect endpoint specified by load balancer.
+ */
+public final class XconnectLoadBalancerEndpoint extends XconnectEndpoint {
+    private final int key;
+
+    private XconnectLoadBalancerEndpoint(int key) {
+        this.key = key;
+    }
+
+    /**
+     * Returns load balancer key.
+     *
+     * @return load balancer key.
+     */
+    public int key() {
+        return key;
+    }
+
+    /**
+     * Returns an instance of XconnectLoadBalancerEndpoint with given load balancer key.
+     *
+     * @param key load balancer key
+     * @return an instance of XconnectLoadBalancerEndpoint
+     */
+    public static XconnectLoadBalancerEndpoint of(int key) {
+        return new XconnectLoadBalancerEndpoint(key);
+    }
+
+    /**
+     * Gets XconnectLoadBalancerEndpoint from string.
+     *
+     * @param s string
+     * @return XconnectLoadBalancerEndpoint
+     */
+    public static XconnectLoadBalancerEndpoint fromString(String s) {
+        checkArgument(s.matches(LOAD_BALANCER_PATTERN), "String {} does not match {} format", s, LOAD_BALANCER_PATTERN);
+        return new XconnectLoadBalancerEndpoint(Integer.valueOf(s.replaceFirst(LB_KEYWORD, "")));
+    }
+
+    @Override
+    public Type type() {
+        return Type.LOAD_BALANCER;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(key);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof XconnectLoadBalancerEndpoint) {
+            final XconnectLoadBalancerEndpoint other = (XconnectLoadBalancerEndpoint) obj;
+            return Objects.equals(this.key, other.key);
+        }
+        return false;
+    }
+
+    @Override
+    public String toString() {
+        return LB_KEYWORD + String.valueOf(key);
+    }
+}
diff --git a/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectPortEndpoint.java b/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectPortEndpoint.java
new file mode 100644
index 0000000..f26eaf0
--- /dev/null
+++ b/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectPortEndpoint.java
@@ -0,0 +1,90 @@
+/*
+ * Copyright 2019-present Open Networking Foundation
+ *
+ * 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 org.onosproject.segmentrouting.xconnect.api;
+
+import org.onosproject.net.PortNumber;
+
+import java.util.Objects;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+/**
+ * Represents a cross connect endpoint specified by port number.
+ */
+public final class XconnectPortEndpoint extends XconnectEndpoint {
+    private final PortNumber port;
+
+    private XconnectPortEndpoint(PortNumber port) {
+        this.port = port;
+    }
+
+    /**
+     * Returns port number.
+     *
+     * @return port number
+     */
+    public PortNumber port() {
+        return port;
+    }
+
+    /**
+     * Returns an instance of XconnectPortEndpoint with given port number.
+     *
+     * @param port port number
+     * @return an instance of XconnectPortEndpoint
+     */
+    public static XconnectPortEndpoint of(PortNumber port) {
+        return new XconnectPortEndpoint(port);
+    }
+
+    /**
+     * Gets XconnectPortEndpoint from string.
+     *
+     * @param s string
+     * @return XconnectPortEndpoint
+     */
+    public static XconnectPortEndpoint fromString(String s) {
+        checkArgument(s.matches(PORT_PATTERN), "String {} does not match {} format", s, PORT_PATTERN);
+        return new XconnectPortEndpoint(PortNumber.fromString(s));
+    }
+
+    @Override
+    public XconnectEndpoint.Type type() {
+        return Type.PORT;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(port);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof XconnectPortEndpoint) {
+            final XconnectPortEndpoint other = (XconnectPortEndpoint) obj;
+            return Objects.equals(this.port, other.port);
+        }
+        return false;
+    }
+
+    @Override
+    public String toString() {
+        return String.valueOf(port);
+    }
+}
diff --git a/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectService.java b/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectService.java
index fe51b06..2fe6488 100644
--- a/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectService.java
+++ b/app/src/main/java/org/onosproject/segmentrouting/xconnect/api/XconnectService.java
@@ -44,9 +44,9 @@
      *
      * @param deviceId device ID
      * @param vlanId VLAN ID
-     * @param ports set of ports
+     * @param endpoints set of endpoints
      */
-    void addOrUpdateXconnect(DeviceId deviceId, VlanId vlanId, Set<String> ports);
+    void addOrUpdateXconnect(DeviceId deviceId, VlanId vlanId, Set<XconnectEndpoint> endpoints);
 
     /**
      * Deletes Xconnect.