Technical data

Administration Guide A-15
MulticastTest
The MulticastTest utility helps you debug multicast problems when configuring a
WebLogic Cluster. The utility sends out multicast packets and returns information
about how effectively multicast is working on your network. Specifically,
MulticastTest displays the following types of information via standard output:
1. A confirmation and sequence ID for each message sent out by this server.
2. The sequence and sender ID of each message received from any clustered server,
including this server.
3. A missed-sequenced warning when a message is received out of sequence.
4. A missed-message warning when an expected message is not received.
To use
MulticastTest, start one copy of the utility on each node on which you want
to test multicast traffic.
Warning: Do NOT run the
MulticastTest utility by specifying the same multicast
address (the
-a parameter) as that of a currently running WebLogic
Cluster. The utility is intended to verify that multicast is functioning
properly before starting your clustered WebLogic Servers.
For information about setting up multicast, see the configuration documentation for the
operating system/hardware of the WebLogic Server host. For more information about
configuring a cluster, see Using WebLogic Server Clusters.
Syntax
$ java utils.MulticastTest -n name -a address [-p portnumber]
[-t timeout] [-s send]
Argument Definition
-n name
Required. A name that identifies the sender of the sequenced
messages. Use a different name for each test process you start.
-a address
Required. The multicast address on which: (a) the sequenced
messages should be broadcast; and (b) the servers in the clusters are
communicating with each other. (The default for any cluster for
which a multicast address is not set is 237.0.0.1.)