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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