examples: Restoring old examples that can be restored and fixing existing ones
diff --git a/examples/topologies/topo-grid-3x3-red-queues.txt b/examples/topologies/topo-grid-3x3-red-queues.txt
new file mode 100644
index 0000000..b87a0bf
--- /dev/null
+++ b/examples/topologies/topo-grid-3x3-red-queues.txt
@@ -0,0 +1,61 @@
+# topo-grid-3x3.txt
+
+# /--------\ /-\ /-\
+# |Consumer|<---->| |<------->| |
+# \--------/ \-/ \-/
+# ^ ^ ^
+# | | | 1Mbps/10ms delay
+# v v v
+# /-\ /-\ /-\
+# | |<-------->| |<------->| |
+# \-/ \-/ \-/
+# ^ ^ ^
+# | | |
+# v v v
+# /-\ /-\ /--------\
+# | |<-------->| |<---->|Producer|
+# \-/ \-/ \--------/
+
+# any empty lines and lines starting with '#' symbol is ignored
+#
+# The file should contain exactly two sections: router and link, each starting with the corresponding keyword
+#
+# router section defines topology nodes and their relative positions (e.g., to use in visualizer)
+router
+
+# each line in this section represents one router and should have the following data
+# node comment yPos xPos
+Node0 NA 3 1
+Node1 NA 3 2
+Node2 NA 3 3
+Node3 NA 2 1
+Node4 NA 2 2
+Node5 NA 2 3
+Node6 NA 1 1
+Node7 NA 1 2
+Node8 NA 1 3
+# Note that `node` can be any string. It is possible to access to the node by name using Names::Find, see examples.
+
+# link section defines point-to-point links between nodes and characteristics of these links
+link
+
+# Each line should be in the following format (only first two are required, the rest can be omitted)
+# srcNode dstNode bandwidth metric delay queue
+# bandwidth: link bandwidth
+# metric: routing metric
+# delay: link delay
+# queue: comma-separated list, specifying class for Queue (on both sides of the link) and necessary attributes
+# error: comma-separated list, specifying class for ErrorModel and necessary attributes
+Node0 Node1 1Mbps 1 10ms ns3::RedQueue,MeanPktSize=100
+Node0 Node3 1Mbps 1 10ms ns3::RedQueue,MeanPktSize=100
+Node1 Node2 1Mbps 1 10ms ns3::RedQueue,MeanPktSize=100
+Node1 Node4 1Mbps 1 10ms ns3::RedQueue,MeanPktSize=100
+Node2 Node5 1Mbps 1 10ms ns3::RedQueue,MeanPktSize=100
+Node3 Node4 1Mbps 1 10ms ns3::RedQueue,MeanPktSize=100
+Node3 Node6 1Mbps 1 10ms ns3::RedQueue,MeanPktSize=100
+Node4 Node5 1Mbps 1 10ms ns3::RedQueue,MeanPktSize=100
+Node4 Node7 1Mbps 1 10ms ns3::RedQueue,MeanPktSize=100
+Node5 Node8 1Mbps 1 10ms ns3::RedQueue,MeanPktSize=100
+Node6 Node7 1Mbps 1 10ms ns3::RedQueue,MeanPktSize=100
+Node7 Node8 1Mbps 1 10ms ns3::RedQueue,MeanPktSize=100
+