Added SDN-IP CLI command to show the BGP neighbors:

  onos:bgp-neighbors
OR
  onos:bgp-neighbors -n <NeighborID>
  onos:bgp-neighbors --neighbor <NeighborID>

Change-Id: I4e4185d9484384d9e3aa5304c897410b23a24238

@@ -30,6 +30,7 @@ import org.onlab.onos.core.CoreService;
 import org.onlab.onos.net.host.HostService;
 import org.onlab.onos.net.intent.IntentService;
 import org.onlab.onos.sdnip.bgp.BgpRouteEntry;
+import org.onlab.onos.sdnip.bgp.BgpSession;
 import org.onlab.onos.sdnip.bgp.BgpSessionManager;
 import org.onlab.onos.sdnip.config.SdnIpConfigReader;
 import org.slf4j.Logger;
@@ -97,6 +98,11 @@ public class SdnIp implements SdnIpService {
     }
 
     @Override
+    public Collection<BgpSession> getBgpSessions() {
+        return bgpSessionManager.getBgpSessions();
+    }
+
+    @Override
     public Collection<BgpRouteEntry> getBgpRoutes() {
         return bgpSessionManager.getBgpRoutes();
     }

@@ -18,12 +18,20 @@ package org.onlab.onos.sdnip;
 import java.util.Collection;
 
 import org.onlab.onos.sdnip.bgp.BgpRouteEntry;
+import org.onlab.onos.sdnip.bgp.BgpSession;
 
 /**
  * Service interface exported by SDN-IP.
  */
 public interface SdnIpService {
     /**
+     * Gets the BGP sessions.
+     *
+     * @return the BGP sessions
+     */
+    public Collection<BgpSession> getBgpSessions();
+
+    /**
      * Gets the BGP routes.
      *
      * @return the BGP routes

+/*
+ * Copyright 2014 Open Networking Laboratory
+ *
+ * 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.onlab.onos.sdnip.cli;
+
+import java.util.Collection;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.apache.karaf.shell.commands.Command;
+import org.apache.karaf.shell.commands.Option;
+import org.onlab.onos.cli.AbstractShellCommand;
+import org.onlab.onos.sdnip.SdnIpService;
+import org.onlab.onos.sdnip.bgp.BgpSession;
+
+/**
+ * Command to show the BGP neighbors.
+ */
+@Command(scope = "onos", name = "bgp-neighbors",
+         description = "Lists the BGP neighbors")
+public class BgpNeighborsListCommand extends AbstractShellCommand {
+    @Option(name = "-n", aliases = "--neighbor",
+            description = "BGP neighbor to display information about",
+            required = false, multiValued = false)
+    private String bgpNeighbor;
+
+    private static final String FORMAT_NEIGHBOR_LINE1 =
+        "BGP neighbor is %s, remote AS %d, local AS %d";
+    private static final String FORMAT_NEIGHBOR_LINE2 =
+        "  Remote router ID %s, IP %s, BGP version %d, Hold time %d";
+    private static final String FORMAT_NEIGHBOR_LINE3 =
+        "  Local router ID %s, IP %s, BGP version %d, Hold time %d";
+
+    @Override
+    protected void execute() {
+        SdnIpService service = get(SdnIpService.class);
+        Collection<BgpSession> bgpSessions = service.getBgpSessions();
+
+        if (bgpNeighbor != null) {
+            // Print a single neighbor (if found)
+            BgpSession foundBgpSession = null;
+            for (BgpSession bgpSession : bgpSessions) {
+                if (bgpSession.getRemoteBgpId().toString().equals(bgpNeighbor)) {
+                    foundBgpSession = bgpSession;
+                    break;
+                }
+            }
+            if (foundBgpSession != null) {
+                printNeighbor(foundBgpSession);
+            } else {
+                print("BGP neighbor %s not found", bgpNeighbor);
+            }
+            return;
+        }
+
+        // Print all neighbors
+        printNeighbors(bgpSessions);
+    }
+
+    /**
+     * Prints all BGP neighbors.
+     *
+     * @param bgpSessions the BGP sessions for the neighbors to print
+     */
+    private void printNeighbors(Collection<BgpSession> bgpSessions) {
+        if (outputJson()) {
+            print("%s", json(bgpSessions));
+        } else {
+            for (BgpSession bgpSession : bgpSessions) {
+                printNeighbor(bgpSession);
+            }
+        }
+    }
+
+    /**
+     * Prints a BGP neighbor.
+     *
+     * @param bgpSession the BGP session for the neighbor to print
+     */
+    private void printNeighbor(BgpSession bgpSession) {
+        print(FORMAT_NEIGHBOR_LINE1,
+              bgpSession.getRemoteBgpId().toString(),
+              bgpSession.getRemoteAs(),
+              bgpSession.getLocalAs());
+        print(FORMAT_NEIGHBOR_LINE2,
+              bgpSession.getRemoteBgpId().toString(),
+              bgpSession.getRemoteAddress().toString(),
+              bgpSession.getRemoteBgpVersion(),
+              bgpSession.getRemoteHoldtime());
+        print(FORMAT_NEIGHBOR_LINE3,
+              bgpSession.getLocalBgpId().toString(),
+              bgpSession.getLocalAddress().toString(),
+              bgpSession.getLocalBgpVersion(),
+              bgpSession.getLocalHoldtime());
+    }
+
+    /**
+     * Produces a JSON array of BGP neighbors.
+     *
+     * @param bgpSessions the BGP sessions with the data
+     * @return JSON array with the neighbors
+     */
+    private JsonNode json(Collection<BgpSession> bgpSessions) {
+        ObjectMapper mapper = new ObjectMapper();
+        ArrayNode result = mapper.createArrayNode();
+
+        for (BgpSession bgpSession : bgpSessions) {
+            result.add(json(mapper, bgpSession));
+        }
+        return result;
+    }
+
+    /**
+     * Produces JSON object for a BGP neighbor.
+     *
+     * @param mapper the JSON object mapper to use
+     * @param bgpSession the BGP session with the data
+     * @return JSON object for the route
+     */
+    private ObjectNode json(ObjectMapper mapper, BgpSession bgpSession) {
+        ObjectNode result = mapper.createObjectNode();
+
+        result.put("remoteAddress", bgpSession.getRemoteAddress().toString());
+        result.put("remoteBgpVersion", bgpSession.getRemoteBgpVersion());
+        result.put("remoteAs", bgpSession.getRemoteAs());
+        result.put("remoteHoldtime", bgpSession.getRemoteHoldtime());
+        result.put("remoteBgpId", bgpSession.getRemoteBgpId().toString());
+        //
+        result.put("localAddress", bgpSession.getLocalAddress().toString());
+        result.put("localBgpVersion", bgpSession.getLocalBgpVersion());
+        result.put("localAs", bgpSession.getLocalAs());
+        result.put("localHoldtime", bgpSession.getLocalHoldtime());
+        result.put("localBgpId", bgpSession.getLocalBgpId().toString());
+
+        return result;
+    }
+}

@@ -17,6 +17,9 @@
 
   <command-bundle xmlns="http://karaf.apache.org/xmlns/shell/v1.1.0">
     <command>
+      <action class="org.onlab.onos.sdnip.cli.BgpNeighborsListCommand"/>
+    </command>
+    <command>
       <action class="org.onlab.onos.sdnip.cli.BgpRoutesListCommand"/>
     </command>
     <command>