From 3878c000fe5da0e972cceb629990420be9a1e699 Mon Sep 17 00:00:00 2001
From: Bob Lantz <rlantz@cs.stanford.edu>
Date: Thu, 10 Jul 2014 00:38:18 -0700
Subject: [PATCH] Add nodelib.py, a library of new node types

---
 mininet/nodelib.py | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 mininet/nodelib.py

diff --git a/mininet/nodelib.py b/mininet/nodelib.py
new file mode 100644
index 0000000..6c27f28
--- /dev/null
+++ b/mininet/nodelib.py
@@ -0,0 +1,45 @@
+"""
+Package: nodelib
+
+Node Library for Mininet
+
+This contains additional node types which you may find to be useful
+"""
+
+from mininet.net import Mininet
+from mininet.topo import Topo
+from mininet.node import Switch
+from mininet.log import setLogLevel, info
+
+class LinuxBridge( Switch ):
+    "Linux Bridge (with optional spanning tree)"
+
+    nextPrio = 100  # next bridge priority for spanning tree
+
+    def __init__( self, name, stp=False, prio=None, **kwargs ):
+        """stp: use spanning tree protocol? (default False)
+           prio: optional explicit bridge priority for STP"""
+        self.stp = stp
+        if prio:
+            self.prio = prio
+        else:
+            self.prio = LinuxBridge.nextPrio
+            LinuxBridge.nextPrio += 1
+        Switch.__init__( self, name, **kwargs )
+
+    def start( self, controllers ):
+        self.cmd( 'ifconfig', self, 'down' )
+        self.cmd( 'brctl delbr', self )
+        self.cmd( 'brctl addbr', self )
+        if self.stp:
+            self.cmd( 'brctl setbridgeprio', self.prio )
+            self.cmd( 'brctl stp', self, 'on' )
+        for i in self.intfList():
+            if self.name in i.name:
+                self.cmd( 'brctl addif', self, i )
+        self.cmd( 'ifconfig', self, 'up' )
+
+    def stop( self ):
+        self.cmd( 'ifconfig', self, 'down' )
+        self.cmd( 'brctl delbr', self )
+