
Important OSM/ESM Functions
2-15
Industrial Ethernet OSM/ESM Network Management
C79000-G8976-C137-08
2.13 BOOTP/DHCP
If there is a BOOTP or DHCP server in your network, the OSM/ESM can
automatically obtain the following from the server:
S the IP address,
S the subnet mask,
S the IP address of the default gateway,
S the IP address of the TFTP server,
S the configuration file (Section 2.17) / or the firmware file name
If the BOOTP/DHCP function is activated on the OSM/ESM (default), BOOTP and
DHCP are always started after starting up the device.
BOOTP and DHCP can only be activated/deactivated together. When started, the
OSM/ESM sends both BOOTP and DHCP frames. If a BOOTP and a DHCP
server reply in the network, the DHCP server will be given priority by the
OSM/ESM.
Note
The BOOTP/DHCP process delays the startup of the device by approximately 40
seconds if the BOOTP/DHCP server is not obtainable. For this reason,
BOOTP/DHCP is deactivated as soon as an IP address is set using WBM, CLI,
direct SNMP access or the Primary Setup Tool.
Note
DHCP provides a mechanism that allows a client to lease an IP address for a
limited lease time. When the lease time expires, the OSM/ESM can no longer be
contacted using its previous IP address. If you use DHCP, please check the
(default) settings of the DHCP server regarding the lease time.
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