Definition

TP (short for transport) is the base class for all transport protocols, including TCP, UDP and TCP-NIO. All parameters that are listed here can be used in all subclasses.

A transport protocol is a protocol that is responsible for actually sending messages on the network and receiving them from the network.

Configuration Parameters

persistent_ports="true" Whether or not to maintain the list of recently used ports in stable storage

persistent_ports_file="/tmp/jgroups-ports.txt" The fully qualified filename of the file in which persistent ports are maintained

ports_expiry_time="30000" The time in ms after which ports are removed and can subsequently be reused

For more information read this (reincarnation section)