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Chapter 6. Multicast Protocol
Abstract
Multicast is an unreliable protocol that allows clients to connect to brokers using IP multicast.
URI syntax
Example 6.1, “Multicast URI” shows the syntax for a Multicast connection.
Example 6.1. Multicast URI
multicast://Host:[Port]?transportOptions
Transport options
The Multicast protocol supports the following transport options:
| Property | Default | Description |
|---|---|---|
group | default | Specifies a unique group name that can segregate multicast traffic. |
minmumWireFormatVersion | 0 | Specifies the minimum wire format version that is allowed. |
trace | false | Causes all commands sent over the transport to be logged. |
useLocalHost | true | When true, causes the local machine's name to resolve to localhost. |
datagramSize | 4 * 1024 | Specifies the size of a datagram. |
timeToLive | -1 | Specifies the time to live of datagrams. Set greater than 1 to send packets beyond the local network. [a] |
loopBackMode | false | Specifies whether loopback mode is used. |
wireFormat | The name of the wire format to use. | |
wireFormat.* | All the properties with this prefix are used to configure the wireFormat. See Table A.1, “Wire Format Options Supported by OpenWire Protocol” for more information. | |
jms.* | All the properties with this prefix are used to configure client connections to a broker. See Appendix B, Client Connection Options for more information. | |
[a]
This won't work for IPv4 addresses without setting the property java.net.preferIPv4Stack=true.
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