Hello
Please refer this mail:
http://sourceforge.net/p/ryu/mailman/message/34306184/
legacy switch will not forward lldp packet.
2015-09-02 16:41 GMT+08:00 FIXED-TERM Vardhan Harsha (CR/AEH4) <
[email protected]>:
> Hello Iwase,
>
> I had 2 monitoring Non-SDN switches in between the openvswitches to
> perform measurements and also to have packet traces of the flows in the
> network through Wireshark.
>
> So I read a paper where if you have non-sdn switches in your network in
> between the openvswitches the controller won't be able to see it.
>
> So I disconnected the switches to check the theory and now have only
> openvswitches in my network and all the links are being discovered. And I
> added a rule to drop all lldp packets once all the links are discovered.
>
> My network before:
>
> OVS2-----OVS1------monitoring-------OVS3
> | Switch1 |
> Monitoring----------------------------------------
> Switch2
>
> My network now :
>
> OVS2----OVS1----OVS3
> |---------------------------|
>
>
> I still have a question whether you can write an application so that the
> lldp packets generated by the controller can still be used to discover all
> the links, even when we have a non-sdn switch in between, which will be
> just forwarding the packets.
> Can it be done ?
> Can you guide me regarding the same.
>
> Thanks for your help.
>
>
> Mit freundlichen Grüßen / Best regards
>
> Harsha Vardhan
> Communication Technology (CR/AEH4)
>
> [email protected]
>
>
> -----Original Message-----
> From: Yusuke Iwase [mailto:[email protected]]
> Sent: Mittwoch, 2. September 2015 02:55
> To: FIXED-TERM Vardhan Harsha (CR/AEH4) <
> [email protected]>
> Cc: [email protected]
> Subject: Re: [Ryu-devel] FW: link discovery in multipath topology
>
> Hi,
>
> Would you mind telling us how you figured out your problem?
> I think your information is very helpful for other users who face to the
> similar problem.
>
> Thanks,
> Iwase
>
> On 2015年09月01日 00:31, FIXED-TERM Vardhan Harsha (CR/AEH4) wrote:
> > Hello Iwase,
> >
> > Please ignore my last mail I figured out the problem.
> > Thanks for your help.
> >
> > Mit freundlichen Grüßen / Best regards
> >
> > Harsha Vardhan
> > Communication Technology (CR/AEH4)
> >
> > [email protected]
> >
> >
> > -----Original Message-----
> > From: FIXED-TERM Vardhan Harsha (CR/AEH4)
> > Sent: Montag, 31. August 2015 15:32
> > To: 'Ryu-devel' <[email protected]>
> > Subject: RE: [Ryu-devel] link discovery in multipath topology
> >
> > Hello Iwase,
> >
> > I'm not using simple_switch_13.py app . I'm using another app called
> getswitches.py which I'll be attaching with the mail.
> >
> > The thing is the topology module works well when I need to discover
> links on my virtual network containing loops in mininet, but when I work
> with openVswitches running on 3 three different PCs it doesn’t discover
> all the links.right now link discovery is more important for me.
> >
> > I'm also attaching the ryu traces in both the cases I just
> described.Also with this mail ill be attaching the mininet topology.
> > I would like some guidance regarding this issue.
> >
> > As far as I know I can also add a flow to drop the lldp packets after a
> certain time period, during which all the links can be discovered .
> > Thanks for your help.
> >
> > Mit freundlichen Grüßen / Best regards
> >
> > Harsha Vardhan
> > Communication Technology (CR/AEH4)
> >
> > [email protected]
> >
> >
> > -----Original Message-----
> > From: Yusuke Iwase [mailto:[email protected]]
> > Sent: Freitag, 28. August 2015 10:03
> > To: FIXED-TERM Vardhan Harsha (CR/AEH4)
> > <[email protected]>
> > Cc: [email protected]
> > Subject: Re: [Ryu-devel] link discovery in multipath topology
> >
> > Hi,
> >
> > On 2015年08月27日 18:02, FIXED-TERM Vardhan Harsha (CR/AEH4) wrote:
> >> Hello all,
> >>
> >>
> >>
> >> I’m trying to perform link discovery in my multipath topology using the
> ryu built-in topology module.
> >>
> >> But when I use this there is lldp multicast storm and also not all the
> links are discovered .
> >>
> >> Can you please guide me how to go about changing the code so as to
> discover all the links as well as to stop lldp multicast storm.
> >>
> >> My topology is as following :
> >>
> >>
> >>
> >>
> >> --------------OVS1------------
> >>
> >> |
> |
> >>
> >> |
> |
> >>
> >> OVS2-----------------------OVS3
> >>
> >>
> >>
> >> Thanks for the help.
> >
> > Did you get the following ryu-manager log?
> > ...
> > packet in 2 4a:92:a6:d1:d2:3d 33:33:00:00:00:16 3 packet in 2
> 16:d3:fb:a7:82:03 33:33:00:00:00:16 3 EVENT ofp_event->SimpleSwitch13
> EventOFPPacketIn EVENT ofp_event->SimpleSwitch13 EventOFPPacketIn EVENT
> ofp_event->SimpleSwitch13 EventOFPPacketIn EVENT ofp_event->SimpleSwitch13
> EventOFPPacketIn packet in 3 4a:92:a6:d1:d2:3d 33:33:00:00:00:16 2 packet
> in 3 4a:92:a6:d1:d2:3d 33:33:00:00:00:02 2 packet in 3 16:d3:fb:a7:82:03
> 33:33:00:00:00:02 2 packet in 3 4a:92:a6:d1:d2:3d 33:33:00:00:00:16 2 ...
> >
> > On my environment, IPv6 multicast packets seem to be a cause of the
> multicast storm.
> >
> > How about installing the following flow entry into each switch at switch
> features event?
> > priority=65535,dl_dst=33:33:00:00:00:00/ff:ff:00:00:00:00
> > actions=drop
> >
> > e.g.)
> > $ git diff
> > diff --git a/ryu/app/simple_switch_13.py b/ryu/app/simple_switch_13.py
> > index 3e7c598..c0e4f02 100644
> > --- a/ryu/app/simple_switch_13.py
> > +++ b/ryu/app/simple_switch_13.py
> > @@ -21,6 +21,7 @@ from ryu.ofproto import ofproto_v1_3 from
> > ryu.lib.packet import packet from ryu.lib.packet import ethernet
> > from ryu.lib.packet import ether_types
> > +from ryu.topology import api
> >
> >
> > class SimpleSwitch13(app_manager.RyuApp):
> > @@ -48,6 +49,11 @@ class SimpleSwitch13(app_manager.RyuApp):
> > ofproto.OFPCML_NO_BUFFER)]
> > self.add_flow(datapath, 0, match, actions)
> >
> > + match = parser.OFPMatch(eth_dst=('33:33:00:00:00:00',
> > + 'ff:ff:00:00:00:00'))
> > + actions = []
> > + self.add_flow(datapath, 65535, match, actions)
> > +
> > def add_flow(self, datapath, priority, match, actions,
> buffer_id=None):
> > ofproto = datapath.ofproto
> > parser = datapath.ofproto_parser
> >
> > Then, run ryu-manager with this command.
> > $ ryu-manager --observe-links --verbose ryu.app.simple_switch_13
> >
> > Thanks,
> > Iwase
> >
> >
> >>
> >>
> >>
> >> Mit freundlichen Grüßen / Best regards
> >>
> >> *Harsha Vardhan
> >> *Communication Technology (CR/AEH4)
> >>
> >> [email protected]
> >> <mailto:[email protected]>
> >>
> >>
> >>
> >> ---------------------------------------------------------------------
> >> -
> >> --------
> >>
> >>
> >>
> >> _______________________________________________
> >> Ryu-devel mailing list
> >> [email protected]
> >> https://lists.sourceforge.net/lists/listinfo/ryu-devel
> >>
> > ----------------------------------------------------------------------
> > -------- _______________________________________________
> > Ryu-devel mailing list
> > [email protected]
> > https://lists.sourceforge.net/lists/listinfo/ryu-devel
> >
>
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--
Yi Tseng (a.k.a Takeshi)
Taiwan National Chiao Tung University
Department of Computer Science
W2CNLab
http://blog.takeshi.tw
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