diff --git a/core/common/src/main/java/org/onosproject/common/DefaultTopology.java b/core/common/src/main/java/org/onosproject/common/DefaultTopology.java
index bdf7d73..08b5245 100644
--- a/core/common/src/main/java/org/onosproject/common/DefaultTopology.java
+++ b/core/common/src/main/java/org/onosproject/common/DefaultTopology.java
@@ -25,12 +25,16 @@
 import org.onlab.graph.DijkstraGraphSearch;
 import org.onlab.graph.GraphPathSearch;
 import org.onlab.graph.GraphPathSearch.Result;
+import org.onlab.graph.SRLGGraphSearch;
+import org.onlab.graph.SuurballeGraphSearch;
 import org.onlab.graph.TarjanGraphSearch;
 import org.onlab.graph.TarjanGraphSearch.SCCResult;
 import org.onosproject.net.AbstractModel;
 import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.DefaultDisjointPath;
 import org.onosproject.net.DefaultPath;
 import org.onosproject.net.DeviceId;
+import org.onosproject.net.DisjointPath;
 import org.onosproject.net.Link;
 import org.onosproject.net.Path;
 import org.onosproject.net.provider.ProviderId;
@@ -46,6 +50,7 @@
 import org.onosproject.net.topology.TopologyVertex;
 
 import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
@@ -67,6 +72,9 @@
 
     private static final DijkstraGraphSearch<TopologyVertex, TopologyEdge> DIJKSTRA = new DijkstraGraphSearch<>();
     private static final TarjanGraphSearch<TopologyVertex, TopologyEdge> TARJAN = new TarjanGraphSearch<>();
+    private static final SuurballeGraphSearch<TopologyVertex, TopologyEdge> SUURBALLE =
+            new SuurballeGraphSearch<>();
+
 
     private final long time;
     private final long creationTime;
@@ -314,6 +322,142 @@
         }
         return builder.build();
     }
+    /**
+     /**
+     * Returns the set of pre-computed shortest disjoint path pairs between source and
+     * destination devices.
+     *
+     * @param src source device
+     * @param dst destination device
+     * @return set of shortest disjoint path pairs
+     */
+    Set<DisjointPath> getDisjointPaths(DeviceId src, DeviceId dst) {
+        return getDisjointPaths(src, dst, null);
+    }
+
+    /**
+     * Computes on-demand the set of shortest disjoint path pairs between source and
+     * destination devices.
+     *
+     * @param src    source device
+     * @param dst    destination device
+     * @param weight link weight function
+     * @return set of disjoint shortest path pairs
+     */
+    Set<DisjointPath> getDisjointPaths(DeviceId src, DeviceId dst, LinkWeight weight) {
+        final DefaultTopologyVertex srcV = new DefaultTopologyVertex(src);
+        final DefaultTopologyVertex dstV = new DefaultTopologyVertex(dst);
+        Set<TopologyVertex> vertices = graph.getVertexes();
+        if (!vertices.contains(srcV) || !vertices.contains(dstV)) {
+            // src or dst not part of the current graph
+            return ImmutableSet.of();
+        }
+
+        GraphPathSearch.Result<TopologyVertex, TopologyEdge> result =
+                SUURBALLE.search(graph, srcV, dstV, weight, ALL_PATHS);
+        ImmutableSet.Builder<DisjointPath> builder = ImmutableSet.builder();
+        for (org.onlab.graph.Path<TopologyVertex, TopologyEdge> path : result.paths()) {
+            builder.add(networkDisjointPath((org.onlab.graph.DisjointPathPair<TopologyVertex, TopologyEdge>) path));
+        }
+        return builder.build();
+    }
+
+    /**
+     * Computes on-demand the set of shortest disjoint risk groups path pairs between source and
+     * destination devices.
+     *
+     * @param src           source device
+     * @param dst           destination device
+     * @param riskProfile   map representing risk groups for each edge
+     * @return  set of shortest disjoint paths
+     */
+    Set<DisjointPath> getSRLGDisjointPathsD(DeviceId src, DeviceId dst, Map<TopologyEdge, Object> riskProfile) {
+        return getSRLGDisjointPathsD(src, dst, null, riskProfile);
+    }
+
+    /**
+     * Computes on-demand the set of shortest disjoint risk groups path pairs between source and
+     * destination devices.
+     *
+     * @param src       source device
+     * @param dst       destination device
+     * @param weight    edge weight object
+     * @param riskProfile   map representing risk groups for each edge
+     * @return set of shortest disjoint paths
+     */
+    Set<DisjointPath> getSRLGDisjointPathsD(DeviceId src, DeviceId dst, LinkWeight weight, Map<TopologyEdge,
+            Object> riskProfile) {
+        final DefaultTopologyVertex srcV = new DefaultTopologyVertex(src);
+        final DefaultTopologyVertex dstV = new DefaultTopologyVertex(dst);
+        Set<TopologyVertex> vertices = graph.getVertexes();
+        if (!vertices.contains(srcV) || !vertices.contains(dstV)) {
+            // src or dst not part of the current graph
+            return ImmutableSet.of();
+        }
+
+        SRLGGraphSearch<TopologyVertex, TopologyEdge> srlg = new SRLGGraphSearch<>(riskProfile);
+        GraphPathSearch.Result<TopologyVertex, TopologyEdge> result =
+                srlg.search(graph, srcV, dstV, weight, ALL_PATHS);
+        ImmutableSet.Builder<DisjointPath> builder = ImmutableSet.builder();
+        for (org.onlab.graph.Path<TopologyVertex, TopologyEdge> path : result.paths()) {
+            builder.add(networkDisjointPath((org.onlab.graph.DisjointPathPair<TopologyVertex, TopologyEdge>) path));
+        }
+        return builder.build();
+    }
+
+    /**
+     * Computes on-demand the set of shortest disjoint risk groups path pairs between source and
+     * destination devices.
+     *
+     * @param src       source device
+     * @param dst       destination device
+     * @param weight    edge weight object
+     * @param riskProfile   map representing risk groups for each link
+     * @return set of shortest disjoint paths
+     */
+    Set<DisjointPath> getSRLGDisjointPaths(DeviceId src, DeviceId dst, LinkWeight weight,
+                                           Map<Link, Object> riskProfile) {
+        Map<TopologyEdge, Object> riskProfile2 = new HashMap<>();
+        for (Link l : riskProfile.keySet()) {
+            riskProfile2.put(new TopologyEdge() {
+                final Link cur = l;
+
+                public Link link() {
+                    return cur;
+                }
+
+                public TopologyVertex src() {
+                    return new TopologyVertex() {
+                        public DeviceId deviceId() {
+                            return src;
+                        }
+                    };
+                }
+
+                public TopologyVertex dst() {
+                    return new TopologyVertex() {
+                        public DeviceId deviceId() {
+                            return dst;
+                        }
+                    };
+                }
+            }, riskProfile.get(l));
+        }
+        return getSRLGDisjointPathsD(src, dst, weight, riskProfile2);
+    }
+
+    /**
+     * Computes on-demand the set of shortest disjoint risk groups path pairs between source and
+     * destination devices.
+     *
+     * @param src       source device
+     * @param dst       destination device
+     * @param riskProfile   map representing risk groups for each link
+     * @return set of shortest disjoint paths
+     */
+    Set<DisjointPath> getSRLGDisjointPaths(DeviceId src, DeviceId dst, Map<Link, Object> riskProfile) {
+        return getSRLGDisjointPaths(src, dst, null, riskProfile);
+    }
 
     // Converts graph path to a network path with the same cost.
     private Path networkPath(org.onlab.graph.Path<TopologyVertex, TopologyEdge> path) {
@@ -324,6 +468,11 @@
         return new DefaultPath(CORE_PROVIDER_ID, links, path.cost());
     }
 
+    private DisjointPath networkDisjointPath(org.onlab.graph.DisjointPathPair<TopologyVertex, TopologyEdge> path) {
+        return new DefaultDisjointPath(CORE_PROVIDER_ID,
+                                       (DefaultPath) networkPath(path.path1), (DefaultPath) networkPath(path.path2));
+    }
+
     // Searches for SCC clusters in the network topology graph using Tarjan
     // algorithm.
     private SCCResult<TopologyVertex, TopologyEdge> searchForClusters() {