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if the topology is like this:

h1 <----------> s1 <--------------> h2

then the flood flow at s1 is sufficient to provide the communication.

flow :

url :

http://localhost:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/table/0/flow/111

Body:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<flow
    xmlns="urn:opendaylight:flow:inventory">
    <instructions>
        <instruction>
           <order>0</order>
            <apply-actions>
                <action>
                  <order>0</order>
                    <output-action>
                      <output-node-connector>FLOODF</output-node-connector>
                  </output-action>
                </action>
            </apply-actions>
        </instruction>
    </instructions>
    <table_id>0</table_id>
    <id>111</id>
    <cookie_mask>10</cookie_mask>
    <installHw>false</installHw>
    <hard-timeout>0</hard-timeout>
    <cookie>10</cookie>
    <idle-timeout>0</idle-timeout>
    <flow-name>FloodFlow</flow-name>
    <priority>2</priority>
    <barrier>false</barrier>
</flow>

if the topology is like this:

h1 <----------> s1 <--------------> h2

then the flood flow at s1 is sufficient to provide the communication.

flow :

url :

http://localhost:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/table/0/flow/111

Body:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<flow
    xmlns="urn:opendaylight:flow:inventory">
    <instructions>
        <instruction>
           <order>0</order>
            <apply-actions>
                <action>
                  <order>0</order>
                    <output-action>
                      <output-node-connector>FLOODF</output-node-connector>
<output-node-connector>FLOOD</output-node-connector>
                  </output-action>
                </action>
            </apply-actions>
        </instruction>
    </instructions>
    <table_id>0</table_id>
    <id>111</id>
    <cookie_mask>10</cookie_mask>
    <installHw>false</installHw>
    <hard-timeout>0</hard-timeout>
    <cookie>10</cookie>
    <idle-timeout>0</idle-timeout>
    <flow-name>FloodFlow</flow-name>
    <priority>2</priority>
    <barrier>false</barrier>
</flow>