Hi Samantha, It is most likely your OVS configuration which is not connecting two interfaces on switches A and B properly. I am assuming your A and B are on the same machine. Below is the answer to your question regarding how controller determines connectivity between two switches.
The OpenDayLight sends LLDP packets on each interface of the switch with a signature (custom TLV) containing the outgoing interface name. When the LLDP packet is received by the peer switch, being a OF switch, it punts this LLDP packet back to Controller via "Packet In" message. Controller looks for the signature determines that it is the same packet it had sent out on a switch A and now it is received by switch B. Controller has the outgoing switch, outgoing interface, incoming switch, and incoming interface. This is all the information needed to form the topology. Thanks Maurice From: samantha Andares <sam.anda...@hotmail.com<mailto:sam.anda...@hotmail.com>> Date: Wednesday, June 11, 2014 10:59 AM To: "discuss@openvswitch.org<mailto:discuss@openvswitch.org>" <discuss@openvswitch.org<mailto:discuss@openvswitch.org>> Subject: [ovs-discuss] How does the controller determines that 2 ovs-switch are connected? Hi all, I understand that might be a question more related to the controller, but at this point, i am not sure. So, basically, i have such a configuration: -------- --------- ---------------- | A | -eth0--> eth0 -| B | -eth4 ----- LAN ------eth4 | Controller | -------- --------- ----------------- node A and B are 2 ovs-switch.... I can get both A and B to connect to the controller, but the controller, in my case OpenDaylight, does not draw a line between A and B... meaning it doens't know they are connected together, right?.... how can we have both connected? If i had a br0:1 interface on A with the LAN subnet that is between B and the controller, it shows that br0:1 address as a host connected to B for that address. Anyone knows why it doesn't see a link between A and B or why it sees br0:1 as a host? Does anyone know how the controller determines if 2 nodes are connected to each other (in my case I would expect it to see that eth0 in br0 of A is connected to eth0 in br0 of B)... maybe by knowing that i could fix that up ... thanks, sam
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