Allied Telesis AT-S101 - Manual (Page 28)

Chapter 2: Basic Switch Parameters
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3. From the pull-down menu next to the DHCP Mode field, select Enable
or Disable.
By default, this field is set to Disable.
4. Click Apply.
If you enable the DHCP client, the web server connection to the switch
is lost.
If you disable the DHCP client, note the new System IP Address
value that you assigned to the switch. Record this value for future use.
Caution
Enabling or disabling DHCP ends your management session.
Caution
If you do not select Save Configuration to Flash, the DHCP mode
reverts to its default setting of 192.168.1.1 when you power cycle
the switch.
5. Log on to the switch with the new IP address and immediately save
your configuration by selecting Save Configuration to Flash from the
menu on the left side of the page.
If you enable DHCP and then save your configuration, you save the IP
address on the DHCP server.
If you disable DHCP, enter a new IP address, and then save your
configuration, you have saved the DHCP setting and the new IP
address on the switch.