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TIBCO BusinessEvents® Enterprise Edition 6.3.1

# Multicast (PGM) Cluster Member Discovery

The discover URL for multicast discovery uses PGM (Pragmatic General Multicast) protocol.

Set the URL value in the Discover URL field of the Legacy ActiveSpaces Cache OM Settings Reference. For multicast discovery, the value is a URL with the following format: tibpgm://destinationPort/network/

The default values equate to the following: `//7888/;239.8.8.9/`

Specify the parameters as follows.

Parameter | Notes
--- | ---
destinationPort | Specifies the destination port used by the PGM transport. Must be the same value on all machines in the cluster. Default value is `7888`.
network | Specifies the IP address of the interface to be used for sending multicast packets, and the multicast group address to be used. The format is as follows: interface; multicast group address The value for interface is unique to a node. It must also be the same in both the discovery and the listen URLs for a node. If there are multiple interfaces on one machine, specify the interface you want to use and do not rely on the default value. The value for multicast group address must be the same on all machines in the cluster. The default value for interface is the first available interface provided by the operating system hosts file for the machine. Note: If the desired interface is not listed in the hosts file then PGM picks the first available interface in the file. (On most operating systems, this file is called the/etc/hosts file.) If the first interface is the loopback interface (127.0.0.1) then PGM fails to start. In this case you would see a stacktrace exception in the log file such as the following:
    SYS_ERROR (multicast_error - (8) grp_iface not a valid multicast interface)
To resolve this issue, either modify the hosts file, or provide the desired interface explicitly in the network argument. The default value for multicast group address is the multicast group address `239.8.8.9`.

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TIBCO BusinessEvents® Enterprise Edition

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