Chapter 10: Boot P/Dhcp Support; Startup Process - 3Com VCX V7111 User Manual

C 10: B
HAPTER
The startup process (illustrated in
(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.

Startup Process

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 (see the
parameters 'IniFileURL' and 'CmpFileURL' described in
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.
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
and can be used for gateway configuration.
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.
3Com VCX V7111 VoIP SIP Gateway User Manual
P/DHCP S
OOT
Figure 90 on page 184) begins when the gateway is reset
Table 42
™
NT DHCP server, are backward-compatible with BootP protocol
UPPORT
on page 115). Thus, the
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