Add port status change command

mininet/cli.py

@@ -33,7 +33,7 @@ Bugs/limitations:
 from subprocess import call
 from cmd import Cmd
 
-from mininet.log import info, output
+from mininet.log import info, output, error
 
 class CLI( Cmd ):
     "Simple command-line interface to talk to nodes."
@@ -147,6 +147,15 @@ class CLI( Cmd ):
         for node in self.nodelist:
             output( '%s\n' % node )
 
+    def do_link( self, args ):
+        "Bring a link up or down."
+        if len(args) != 3:
+            error( 'invalid number of args: link [up down] end1 end2\n' )
+        elif args[ 0 ] not in [ 'up', 'down' ]:
+            error( 'invalid type: link [up down] end1 end2\n' )
+        else:
+            self.mn.link( *args )
+
     def do_exit( self, args ):
         "Exit"
         return 'exited by user command'

mininet/net.py

@@ -483,6 +483,33 @@ class Mininet( object ):
         "Run iperf UDP test."
         return self.iperf( l4Type='UDP', udpBw=udpBw )
 
+    def link( self, type, src, dst ):
+        """Change link status.
+           type: string {up, down}
+           src: string
+           dst: string"""
+        if src not in self.nameToNode:
+            error( 'src not in network: %s\n' % src )
+        elif dst not in self.nameToNode:
+            error( 'dst not in network: %s\n' % dst )
+        else:
+            srcNode = self.nameToNode[ src ]
+            dstNode = self.nameToNode[ dst ]
+            srcID = int( src[ 1: ] )
+            dstID = int( dst[ 1: ] )
+            if self.topo.port( srcID, dstID ) is None:
+                error( 'src and dst not connected: %s %s\n' % ( src, dst) )
+            else:
+                srcPort, dstPort = self.topo.port( srcID, dstID )
+                srcIntf = srcNode.intfs[ srcPort ]
+                dstIntf = dstNode.intfs[ dstPort ]
+                result = srcNode.cmd( [ 'ifconfig', srcIntf, type ] )
+                if result:
+                    error( 'link src status change failed: %s\n' % result )
+                result = dstNode.cmd( [ 'ifconfig', dstIntf, type ] )
+                if result:
+                    error( 'link dst status change failed: %s\n' % result )
+
     def interact( self ):
         "Start network and run our simple CLI."
         self.start()