CTI 2572-A, Installation And Operation Manual

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CTI 2572-A Installation and Operation Guide V1.3 111
You may also exclude IP addresses within the
scope range using the Add Exclusions dialog
box. In the example, the IP addresses from
192.168.1.100 through 192.168.1.120 are
excluded.
It is important to make sure that all addresses
on the subnet that are specified by some other
method (such as manual configuration) be
excluded from the scope. If these are not
excluded, the DHCP server may attempt to
assign these addresses to another network
station, resulting in duplicate IP address
assignments.
Establish Reservations
The reservations facility allows you to specify a fixed IP address that will be assigned to a particular
network station.
NOTE:
Every 2572A that uses DHCP should have
a unique reserved IP address
Figure 20 shows an example of creating a
reservation. In the IP address box, enter
the IP address which you want to assign to
the module. In the example, the IP address
is set to 192.168.1.56.
In the MAC Address box, enter
0020252572 followed by the value to
which the Module ID switch will be set. In
the example, the Module ID switch will be
set to 56.
In this example, when you startup a 2572-A
module with the Module ID set to 56, the
IP address of 192.168.1.56 will
automatically be assigned to it. Also, the
subnet mask of the scope (255.255.255.0) will be assigned.
NOTE:
In the above example, the value of the last octet of the IP address matches the Module ID value.
Although this direct correspondence is not required, it is a helpful method in keeping track of module
IP assignments.
Figure 19. DHCP Scope Exclusions
Figure 20. DHCP Reservation Dialog Box