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http://svn.apache.org/viewvc/incubator/activemq/site/what-is-the-difference-between-discovery-multicast-and-zeroconf.html?rev=431859&view=auto
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incubator/activemq/site/what-is-the-difference-between-discovery-multicast-and-zeroconf.html
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incubator/activemq/site/what-is-the-difference-between-discovery-multicast-and-zeroconf.html
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(producer or consumer) establishing a &apos;transport connector&apos; to the 
broker or a broker establishing &apos;network connector&apos; to another broker 
without explicit static configuration of broker (IP or hostname).</P>
+
+<P>The scheme &apos;multicast&apos; refers to either listening for or 
advertising discovery events on a multicast address. zeroconf is similar to 
multicast, expect for protocol specific to Apple&apos;s Rendezvous 
(bonjour).</P>
+
+<H3><A 
name="Whatisthedifferencebetweendiscovery%2Cmulticastandzeroconf-Broker"></A>Broker</H3>
+
+<DIV class="code"><DIV class="codeContent">
+<PRE class="code-java">&lt;networkConnectors&gt;
+     &lt;networkConnector name=<SPAN class="code-quote">&quot;<SPAN 
class="code-keyword">default</SPAN>&quot;</SPAN> uri=<SPAN 
class="code-quote">&quot;multicast:<SPAN class="code-comment">//<SPAN 
class="code-keyword">default</SPAN>&quot;</SPAN>/&gt;
+</SPAN>   &lt;/networkConnectors&gt;</PRE>
+</DIV></DIV>
+
+<P>The above configuration in the broker xml file will make it automatically 
establish network connectors to other brokers that advertise themselves on the 
multicast address: when this broker gets a discovery event from another broker, 
the event has information that enables it to establish network connector to 
that broker.</P>
+
+<P>Self-advertisement is facilitated by the following config:</P>
+
+
+<DIV class="code"><DIV class="codeContent">
+<PRE class="code-java">&lt;transportConnectors&gt;
+      &lt;transportConnector name=<SPAN class="code-quote">&quot;<SPAN 
class="code-keyword">default</SPAN>&quot;</SPAN> uri=<SPAN 
class="code-quote">&quot;tcp:<SPAN 
class="code-comment">//localhost:61616&quot;</SPAN> discoveryUri=<SPAN 
class="code-quote">&quot;multicast://<SPAN 
class="code-keyword">default</SPAN>&quot;</SPAN>/&gt;
+</SPAN>   &lt;/transportConnectors&gt;</PRE>
+</DIV></DIV>
+
+<H3><A 
name="Whatisthedifferencebetweendiscovery%2Cmulticastandzeroconf-Client"></A>Client</H3>
+
+<P>An example usage of discovery on the client side (using the transport 
&apos;discovery&apos; that uses discovery agent) ...</P>
+
+
+<DIV class="code"><DIV class="codeContent">
+<PRE class="code-java">&lt;transportConnectors&gt;
+      &lt;transportConnector name=<SPAN class="code-quote">&quot;<SPAN 
class="code-keyword">default</SPAN>&quot;</SPAN> uri=<SPAN 
class="code-quote">&quot;discovery:(multicast:<SPAN 
class="code-comment">//<SPAN 
class="code-keyword">default</SPAN>)&quot;</SPAN>/&gt;
+</SPAN>   &lt;/transportConnectors&gt;</PRE>
+</DIV></DIV>
+
+<P>ps: discovery (which is a confusing name) is just like a 
&apos;reliable&apos; transport such as <A 
href="failover-transport-reference.html" title="Failover Transport 
Reference">failover</A>. If it is unable to connect to a broker, it will try 
another broker (assuming it<BR>
+heard its advertisement over multicast).</P></DIV>
+          
+                  </DIV>
+        </TD>
+      </TR>
+      </TABLE>     
+      </DIV>
+    </DIV>
+    <DIV id="site-footer">
+          Added by     <A 
href="http://goopen.org/confluence/users/viewuserprofile.action?username=jstrachan";>James
 Strachan</A>,
+    last edited by     <A 
href="http://goopen.org/confluence/users/viewuserprofile.action?username=jstrachan";>James
 Strachan</A> on Aug 16, 2006
+                  &nbsp;(<A 
href="http://goopen.org/confluence/pages/diffpages.action?pageId=9676&originalId=9677";>view
 change</A>)
+              
+      (<A 
href="http://goopen.org/confluence/pages/editpage.action?pageId=9676";>edit 
page</A>)
+    </DIV>
+
+  </BODY>
+
+</HTML>
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