First setup working

.gitignore

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+logs/

two-nodes/conf/zebra-R1.conf

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+! -*- zebra -*-
+
+hostname R1
+
+interface lo
+  ip address 10.0.0.1/32
+
+interface R1-eth1
+  ip address 10.0.1.1/24
+
+log file /tmp/R1.log

two-nodes/conf/zebra-R2.conf

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+! -*- zebra -*-
+
+hostname R2
+
+interface lo
+  ip address 10.0.0.2/32
+
+interface R2-eth1
+  ip address 10.0.1.2/24
+
+log file /tmp/R2.log

two-nodes/net.py

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+#!/usr/bin/env python
+
+from mininet.topo import Topo
+from mininet.net import Mininet
+from mininet.cli import CLI
+from mininet.node import Switch, Node
+
+import os
+
+class Router(Switch):
+    """Defines a new router that is inside a network namespace so that the
+    individual routing entries don't collide.
+    """
+    ID = 0
+    def __init__(self, name, **kwargs):
+        kwargs['inNamespace'] = True
+        Switch.__init__(self, name, **kwargs)
+        Router.ID += 1
+        self.switch_id = Router.ID
+
+    @staticmethod
+    def setup():
+        return
+
+    def defaultIntf( self ):
+        if hasattr(self, "controlIntf") and self.controlIntf:
+            return self.controlIntf
+        else:
+            return Node.defaultIntf(self)
+
+    def start(self, controllers):
+        pass
+
+    def stop(self):
+        self.deleteIntfs()
+
+
+class NetTopo(Topo):
+    """The network topology.
+    """
+    def __init__(self):
+        # Add default members to class.
+        super(NetTopo, self ).__init__()
+
+        # The topology has one router per AS
+	routers = [
+            self.addSwitch('R1'),
+            self.addSwitch('R2'),
+        ]
+        hosts = []
+
+        # Setup the links as follows:
+        #
+        # R1 --- R2
+        #
+        self.addLink('R1', 'R2')
+
+        return
+
+
+def main():
+    os.system("rm -f /tmp/R*.log /tmp/R*.pid logs/*")
+    os.system("mn -c >/dev/null 2>&1")
+    os.system("killall -9 zebra > /dev/null 2>&1")
+
+    net = Mininet(topo=NetTopo(), switch=Router)
+    net.start()
+    for router in net.switches:
+        # Enable IP forwarding
+        router.cmd("sysctl -w net.ipv4.ip_forward=1")
+        router.waitOutput()
+
+        # Start Zebra (routing table daemon)
+        router.cmd("/usr/lib/frr/zebra -f conf/zebra-%s.conf -d -i /tmp/zebra-%s.pid > logs/%s-zebra-stdout 2>&1" % (router.name, router.name, router.name))
+        router.waitOutput()
+
+        # Delete spare loopback address for convenience
+        router.cmd("ip addr del 127.0.0.1/8 dev lo")
+        router.waitOutput()
+
+    CLI(net)
+    net.stop()
+    os.system("killall -9 zebra")
+
+
+if __name__ == "__main__":
+    main()