Creating Routing Tables
Local Network Table
Relay Network Table
PC #1 (local node)
Node #1
PC #1
relay network table
End
Relay
network
network
To go to network #3,
first go to node #3 at
network #1.
The local network table is a table describing the correspondences among unit
numbers of the Communications Units and Boards mounted to each node
(PC or FA Computer).
Example
Note
1. The unit number is set (from 0 to F: 1 to 15) by the rotary switch on the front
of the Ethernet Unit.
2. The network address is the number of the network (from 1 to 127) to which
the Communications Unit or Board is connected. It is set when the local
network table is created.
A relay table is a table that shows the nodes to which data should be sent first
in order to send data to a network that is not connected to the local node. It
shows the correspondence between the address of the final destination net-
work, and the network address and node number of the first relay point of the
path to reach there. When internetwork communications are carried out, the
end network can be reached by following the relay points.
The following example shows a routing table for sending data from PC #1 (the
local node: network address 1, node number 1) to PC #4 (the destination
node: network address 3, node number 2).
PC #2 (relay node)
Node #2
Network #1
PC #2
relay network table
End
Relay
Relay
Relay
network
network
node
node
To go to network #3,
first go to node #2 at
network #2.
Unit #04
Unit #05
Unit #06
Unit #07
Network #1
Network #2
Network #3
Network #4
Node #2
PC #3
Unit #0
(relay node)
Node #1
Unit #1
Node #3
Node #1
Network #3
Network #2
End network
PC #3
relay network table
Local
Unit
network
number
address
(To go to network #3
according to the local
network table, go
through the unit
number of the local
CPU Rack.)
Section 3-8
Local Network Table
Local network
Unit number
address
1
04
2
05
3
06
4
07
PC #4 (destination node)
Node #2
(The network is the same,
so go to node #2 at network #3.)
47