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Mediant 2000 SIP User’s Manual 10. BootP/DHCP Support
Version 4.4 167 July 2005
10 BootP/DHCP Support
10.1 Startup Process
The startup process (illustrated in Figure 10-1 on page 168) begins when the gateway is reset
(physically or from the Web / SNMP) and ends when the operational software is running. In the
startup process, the network parameters, software and configuration files are obtained.
After the gateway powers up or after it is physically reset, it broadcasts a BootRequest message
to the network. If it receives a reply (from a BootP server), it changes its network parameters (IP
address, subnet mask and default gateway address) to the values provided. If there is no reply
from a BootP server and if DHCP is enabled (DHCPEnable = 1), the gateway initiates a standard
DHCP procedure to configure its network parameters.
After changing the network parameters, the gateway attempts to load the cmp and various
configuration files from the TFTP server’s IP address, received from the BootP/DHCP servers. If
a TFTP server’s IP address isn’t received, the gateway attempts to load the software (cmp) file
and / or configuration files from a preconfigured TFTP server (refer to the parameters ‘IniFileURL’
and ‘CmpFileURL’ described in Table
6-1 on page 90). Thus, the gateway can obtain its network
parameters from BootP or DHCP servers and its software and configuration files from a different
TFTP server (preconfigured in ini file).
If BootP/DHCP servers are not found or when the gateway is reset from the Web / SNMP, it
retains its network parameters and attempts to load the software (cmp) file and / or configuration
files from a preconfigured TFTP server.
If a preconfigured TFTP server doesn’t exist, the gateway operates using the existing software
and configuration files loaded on its non-volatile memory.
Note that after the operational software runs, if DHCP is configured, the gateway attempts to
renew its lease with the DHCP server.
Note 1: Though DHCP and BootP servers are very similar in operation, the DHCP
server includes some differences that could prevent its operation with BootP
clients. However, many DHCP servers, such as Windows
™
NT DHCP server,
are backward-compatible with BootP protocol and can be used for gateway
configuration.
Note 2: The time duration between BootP/DHCP requests is set to 1 second by
default. This can be changed by the BootPDelay ini file parameter. Also, the
number of requests is 3 by default and can be changed by BootPRetries ini
file parameter. (Both parameters can also be set using the BootP command
line switches).