diff --git a/gnatsd.go b/gnatsd.go
index 9c45d2fd..b9c6ff80 100644
--- a/gnatsd.go
+++ b/gnatsd.go
@@ -4,6 +4,9 @@ package main
 
 import (
 	"flag"
+	"fmt"
+	"net"
+	"net/url"
 	"os"
 	"strings"
 
@@ -53,6 +56,7 @@ func main() {
 	flag.BoolVar(&showVersion, "v", false, "Print version information.")
 	flag.IntVar(&opts.ProfPort, "profile", 0, "Profiling HTTP port")
 	flag.StringVar(&opts.RoutesStr, "routes", "", "Routes to actively solicit a connection.")
+	flag.StringVar(&opts.ClusterListenStr, "cluster_listen", "", "Cluster url from which members can solicit routes.")
 	flag.BoolVar(&showTlsHelp, "help_tls", false, "TLS help.")
 
 	flag.BoolVar(&opts.TLS, "tls", false, "Enable TLS.")
@@ -113,6 +117,12 @@ func main() {
 	// Configure TLS based on any present flags
 	configureTLS(&opts)
 
+	// Configure cluster opts if explicitly set via flags.
+	err = configureClusterOpts(&opts)
+	if err != nil {
+		server.PrintAndDie(err.Error())
+	}
+
 	// Create the server with appropriate options.
 	s := server.New(&opts)
 
@@ -189,3 +199,33 @@ func configureTLS(opts *server.Options) {
 		server.PrintAndDie(err.Error())
 	}
 }
+
+func configureClusterOpts(opts *server.Options) error {
+	if opts.ClusterListenStr == "" {
+		return nil
+	}
+
+	clusterUrl, err := url.Parse(opts.ClusterListenStr)
+	h, p, err := net.SplitHostPort(clusterUrl.Host)
+	if err != nil {
+		return err
+	}
+	opts.ClusterHost = h
+	_, err = fmt.Sscan(p, &opts.ClusterPort)
+	if err != nil {
+		return err
+	}
+
+	if clusterUrl.User != nil {
+		pass, hasPassword := clusterUrl.User.Password()
+		if !hasPassword {
+			return fmt.Errorf("Expected cluster password to be set.")
+		}
+		opts.ClusterPassword = pass
+
+		user := clusterUrl.User.Username()
+		opts.ClusterUsername = user
+	}
+
+	return nil
+}
diff --git a/server/opts.go b/server/opts.go
index 2d6368ef..caa0774e 100644
--- a/server/opts.go
+++ b/server/opts.go
@@ -9,12 +9,12 @@ import (
 	"io/ioutil"
 	"net"
 	"net/url"
+	"os"
 	"strconv"
 	"strings"
 	"time"
 
 	"github.com/nats-io/gnatsd/conf"
-	"os"
 )
 
 // Options block for gnatsd server.
@@ -44,6 +44,7 @@ type Options struct {
 	ClusterAuthTimeout float64       `json:"auth_timeout"`
 	ClusterTLSTimeout  float64       `json:"-"`
 	ClusterTLSConfig   *tls.Config   `json:"-"`
+	ClusterListenStr   string        `json:"-"`
 	ProfPort           int           `json:"-"`
 	PidFile            string        `json:"-"`
 	LogFile            string        `json:"-"`