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RS400 63 ROS™ v3.5
2.2.3.2 Address Learning
Address Learning for TIN
Address learning is implemented for the TIN protocol and learned entries are viewable in
Dynamic Device Address Table.
Address Learning for TIN Mode 1
When a message with unknown source address is received from the IP network, it is learned on
the IP address and IP port. If a message with the same source address is received from another
IP address and/or IP port, the address will be relearned.
Aging time will be reset whenever a unicast TIN message is received from a particular source
address.
The address will be removed from the table when aging time expires.
Address Learning for TIN Mode 2
When a message with unknown source address is received from the IP network, it is learned on
the IP address. If a message with the same source address is received from another IP address
and/or IP port, it will be learned again, and another entry will be created in the Dynamic Device
Address Table (TIN addresses will be duplicated).
Aging time will be reset whenever a unicast TIN message is received from particular source
address.
The address will be removed from the table when aging time expires.
Address Learning for DNP
For DNP protocol both, local and remote concept of address learning is implemented. Source
addresses are learned from messages received from the network for specific IP Address.
Source addresses from messages received from the serial ports are learned for specific local
serial port.
Although DNP protocol can be configured for TCP or UDP transport, UDP transport is used
during the address learning phase as it supports all types of IP addresses: unicast, multicast
and broadcast.
When a message with unknown source address is received from the local serial port, address is
learned on that port and local IP address.
When a message with unknown source address is received from the IP network, on IP interface
that is configured as learning interface, it is learned on the IP address of the sender and serial
port is unknown.
When a message with unknown destination address is received from serial port, an UDP
broadcast datagram is sent to all listeners on IP port configured for DNP protocol on IP interface
that is configured as learning interface. This message will be received also on the device that
just sent it.
When a message with unknown destination address is received from the IP network, it is sent to
all DNP serial ports.