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Renewing DCHP – DHCP may lease addresses to clients
indefinitely or for a specific period of time. If the address expires
or the switch is moved to another network segment, you will lose
management access to the switch. In this case, you can reboot the
switch or submit a client request to restart DHCP service.
Web – If the address assigned by DHCP is no longer functioning,
you will not be able to renew the IP settings via the Web interface.
You can only restart DHCP service via the Web interface if the
current address is still available.
CLI – Enter the following command to restart DHCP service.
Configuring User Authentication
Use the Passwords or Radius menu to restrict management access
based on specified user names and passwords. You can manually
configure access rights on the switch (Passwords menu), or you
can use a remote access authentication server based on the
RADIUS protocol (Radius menu).

Configuring the Logon Password

The guest only has read access for most configuration parameters.
However, the administrator has write access for all parameters
governing the onboard agent. You should therefore assign a new
administrator password as soon as possible, and store it in a safe
place. (If for some reason your password is lost, you can reload
the factory default settings to restore the default password as
described in “Upgrading Firmware via the Serial Port” on page
B-1.)
Console#ip dhcp restart 3-81