Avaya Business Communications Manager 5.0 - Planning and Engineering User Manual Page 270

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270 DHCP overview
Nortel Business Communications Manager 5.0
Planning and Engineering
NN40170-200 01.03 Standard
August 2009
Copyright © 2009 Nortel Networks
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.
You are allowed to disable the DHCP on the integrated router card and enable
the DHCP server on the BCM50 main module. However, if the router card is
not present, then the DHCP server is enabled on the main module to serve
only the IP Phones.
Attention: If you change your LAN IP address to a different subnet address
the system does not provide a default DHCP server address range.
Therefore, the invalid DHCP server address ranges that were on your LAN
subnet are removed.
DHCP default configuration
These network scenarios explain the BCM DHCP functionality.
BCM models
The default DHCP status is assigned to Enabled - IP Phones Only. By default,
the BCM is a DHCP client. There are two cases.
DHCP server on the Main Module
On BCM and BCM50 models, the DHCP server is on the main module.
DHCP network scenarios
Refer to the following section:
BCM configured as DHCP client is unable to reach external DHCP server
(page 271)
BCM using a dynamic address is changed to a static address
If you manually change a dynamic IP address to a static IP address, the VoIP
information for the BCM Lan changes as well.
For example, the S1 and S2 IP addresses for a BCM LAN are dynamically
assigned to 47.166.50.80. If you change the BCM LAN IP address to the static
IP address 47.166.50.114, the S1 and S2 IP addresses also change to
47.166.50.114. If you assign the S1 and S2 IP address manually, and the
address is different from the BCM customer LAN address, these addresses
are not updated.
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