Main Module Dhcp Client; Main Module Dhcp Server; Dhcp Network Scenarios - Nortel BCM50 Configuration Manual

476 Chapter 65 DHCP overview
If you intend to use the BCM50a or BCM50e as a DHCP server, configure the router to be the
DHCP server, as described in the BCM 4.0a Integrated Router Configuration Guide
(NN40020-500) or the BCM 4.0e Integrated Router Configuration Guide (NN40020-501). The
main module disables its own DHCP server if the route-embedded DHCP server is active.

Main Module DHCP client

The main module can act as a DHCP client. As a DHCP client, the Core Module gets an IP address
from another DHCP server on the network. If no other DHCP server is available, the Main Module
uses a static IP address, if one is provided.

Main Module DHCP server

The main module has a DHCP server that provides DHCP and vendor-specific information to IP
sets. It also provides DHCP information to other devices on the LAN, in the event that no other
DHCP Server, such as a router, is available.

DHCP network scenarios

These network scenarios explain the BCM DHCP functionality.
No external DHCP server
With the DHCP Status set to Enabled (Automatic), which is the default, the BCM first attempts
to get a dynamic IP address from a DHCP server. When it does not get a response, it uses the IP
address 192.168.1.2/255.255.255.0. The system goes through the process of looking for a dynamic
IP address each time it reboots. By default, the DHCP server is setup to give out an address range
of 192.168.1.200 - 192.168.1.254.
The BCM DHCP server services all devices requesting DHCP information, such as NortelIP
phones and PCs. This is equivalent to setting the DHCP Status to Enabled (All Devices).
In this situation, the default VoIP settings are:
• S1 IP address: 192.168.1.2
• S1 Port number: 7000
• S1 Action: 1
• S1 Retry count: 1
• S2 IP address: 192.168.1.2
• S2 Port: 7000
• S2 Action: 1
NN40020-603 NN40020-603