From e5d7b3801df2769ef291cd17917b099f990edaa6 Mon Sep 17 00:00:00 2001
From: Brandon Heller <brandonh@stanford.edu>
Date: Thu, 20 Jun 2013 18:47:27 -0700
Subject: [PATCH] topo: make new minimal Graph object a Graph, not a DiGraph

Fixes another Graph regression relative to NetworkX.

RipL broke because the NetworkX Graph object that was used previously
for topologies is an undirected graph:

>>> import networkx as nx
>>> g=nx.Graph()
>>> g.add_edge(0,1)
>>> g[1]
{0: {}}
>>> g[0]
{1: {}}

There is a separate DiGraph object in NetworkX for directed behavior.

The minimal replacement previously implemented DiGraph behavior.

>>> from mininet.topo import Graph
>>> g2=Graph()
>>> g2.add_edge(0,1)
>>> g2[0]
[1]
>>> g2[1]
[]

This commit restores undirected graph behavior.
---
 mininet/topo.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mininet/topo.py b/mininet/topo.py
index d09004c..fa20e19 100644
--- a/mininet/topo.py
+++ b/mininet/topo.py
@@ -29,6 +29,7 @@ class Graph( object ):
         self.add_node( src )
         self.add_node( dest )
         self.data[ src ].append( dest )
+        self.data[ dest ].append( src )
 
     def nodes( self ):
         "Return list of graph nodes"