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]>
>
>
>
> ------------------------------------------------------------------------------
>
>
>
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