[jboss-jira] [JBoss JIRA] Created: (JBAS-3537) Add a startup switch to configure a multicast port

[Brian Stansberry (JIRA)]

Add a startup switch to configure a multicast port
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                 Key: JBAS-3537
                 URL: http://jira.jboss.com/jira/browse/JBAS-3537
             Project: JBoss Application Server
          Issue Type: Feature Request
      Security Level: Public (Everyone can see)
          Components: Clustering
            Reporter: Brian Stansberry
         Assigned To: Brian Stansberry
             Fix For: JBossAS-5.0.0.CR1


Proper cluster isolation with UDP requires use of a different cluster name, different multicast address and different multicast port.  (See http://wiki.jboss.org/wiki/Wiki.jsp?page=PromiscuousTraffic for why the latter is important.)

The -g and -u switches allow easy configuration of the cluster name and multicast address. But, configuring the port that way wasn't practical, as an AS instance may have many different JChannels.

With the JGroups multiplexer, a switch is a possibility, as by default there will only be one JChannel per server instance.  (If a user wanted to use more than one JChannel, they would need to manually configure the second one to use a different port.)

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