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[mininet-discuss] Maybe a bug in mininet

Vinllen Chen cvinllen at gmail.com
Wed May 27 18:48:08 PDT 2015


Hi, Dear all:

    I create 4 switch in mininet, and then connect to controller, but
controller can only get 2 datapath:

# mn --custom tor_topo.py --topo mytopo --mac
--switch=ovsk,protocols=OpenFlow13 --controller=remote
*** Creating network
*** Adding controller
Unable to contact the remote controller at 127.0.0.1:6633
*** Adding hosts:
h1 h2 h3 h4
*** Adding switches:
aaa1 aaa2 top1 top2
*** Adding links:
(aaa1, top1) (aaa1, top2) (aaa2, top1) (aaa2, top2) (h1, aaa1) (h2, aaa1)
(h3, aaa2) (h4, aaa2)
*** Configuring hosts
h1 h2 h3 h4
*** Starting controller
c0
*** Starting 4 switches
aaa1 aaa2 top1 top2 ...
*** Starting CLI:

    #ryu-manage flow.py
loading app flowmod2ovs.py
loading app ryu.controller.ofp_handler
instantiating app None of DPSet
creating context dpset
instantiating app flowmod2ovs.py of OfdpaTe
instantiating app ryu.controller.ofp_handler of OFPHandler
DPSET: Multiple connections from 0000000000000002
=Event DP=
dpid: 2
('127.0.0.1', 53878)
in dp event
=Event DP=
dpid: 1
('127.0.0.1', 53880)
in dp event
DPSET: Multiple connections from 0000000000000001

    It looks like the other 2 switch have same datapath.
    But if i change the switch name: top1 top2 top3 top4, i can get 4
datapath id successfully, so i think it maybe mininet's bug.
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