Using ActiveMQ > Configuring Transports > ActiveMQ Connection URIs > Multicast Transport Reference
The Multicast transport allows clients to connect to a remote ActiveMQ broker using multicast
Note that by default Multicast is not reliable; datagrams can be lost so you should add a reliability layer to ensure the JMS contract can be implemented on a non-reliable transport.
multicast://address:port?transportOptions
| Option Name | Default Value | Description |
|---|---|---|
| group | default | specify a unique group name that can segregate multicast traffic |
| minmumWireFormatVersion | 0 | The minimum version wireformat that is allowed |
| trace | false | Causes all commands that are sent over the transport to be logged |
| useLocalHost | true | When true, it causes the local machines name to resolve to “localhost”. |
| datagramSize | 4 * 1024 | Specifies the size of a datagram |
| timeToLive | -1 | The time to live of datagrams. Set greater than 1 to send packets beyond the local network. (NOTE: This won't work for IPv4 addresses without setting the property java.net.preferIPv4Stack=true. For more info see the IPv6 User Guide for JDK) |
| loopBackMode | false | Should loopback mode be used |
| wireFormat | default | The name of the WireFormat to use |
| wireFormat.* | All the properties with this prefix are used to configure the wireFormat. See Configuring Wire Formats for more information |
To use the default value of “multicast://239.255.2.3:6155” with a default multicast group name of “default” from MulticastDiscoveryAgent use
multicast://default
To specify the IP address and port use
multicast://224.1.2.3:6255
To specify a multicast group name other than the default name of “default” use
multicast://224.1.2.3:6255?group=mygroupname