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Chapter 4 Determining DHCP server configuration and IP address
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If an external DHCP server is present
If an external DHCP is present, then the BCM50 system uses the IP configuration supplied by the
external DHCP server.
In this case, the DHCP server on the main unit only supplies IP Phones with IP configuration
information. It does not supply any other devices with IP settings. This means that the
administrator does not need to set up the external DHCP server to supply configuration settings to
the IP Phones.
The DHCP server on the main unit must configure a range of IP addresses to supply to the
IP Phones. It uses the top 20 percent of a subnet.
For example:
If the external DHCP server supplies the following IP address to the BCM50: 177.218.21.45
(subnet mask is 255.255.255.0); then the BCM50 DHCP server reserves the following range:
177.218.21.200 – 177.218.21.254.
This default range can be verified and changed using Element Manager.
The administrator must ensure that this range agrees with the network configuration — the range is
not used by the external DHCP server.
BCM50a or BCM50e (with integrated router)
By default, the BCM50a main unit or BCM50e
main unit is configured with a dynamic IP address,
meaning that it requests an IP configuration from a DHCP server. Since the integrated router has a
DHCP server, this DHCP server responds to the request.
By default, the router LAN IP address is 192.168.1.1, and the IP address assigned to the BCM50
system is the first IP address in the DHCP pool. If the DHCP pool started at 192.168.1.190, then
the BCM50 is 192.168.1.190 even though the router is 192.168.1.1. So the BCM50 system
receives the IP address 192.168.1.2 (subnet mask is 255.255.255.0) from the DHCP server on the
integrated router.
The DHCP server on the integrated router supplies the information (primary and secondary TPS
server information, VLAN ids) to the IP Phones enabling them to connect to the BCM50. If the IP
address of the integrated router is changed, then the IP address reserved for the BCM50 is
automatically changed. The DHCP server on the integrated router automatically updates the S1
and S2 IP address.
Warning:
The DHCP server on the main unit is enabled by default. If your
network already contains a DHCP server, then disable the DHCP server on the
main unit. Refer to
“To disable the DHCP server on the main unit” on page 69
for
more information on disabling the DHCP server.
Summary of Contents for BCM50
Page 1: ...Part No N0027152 01 08 April 2005 BCM50 Installation and Maintenance Guide ...
Page 8: ...8 Task List N0027152 01 N0027152 01 ...
Page 16: ...16 Contents N0027152 01 N0027152 01 ...
Page 34: ...34 Chapter 1 Getting started with BCM50 N0027152 01 N0027152 01 ...
Page 58: ...58 Chapter 2 Introducing the BCM50 hardware N0027152 01 N0027152 01 ...
Page 70: ...70 Chapter 4 Determining DHCP server configuration and IP address N0027152 01 N0027152 01 ...
Page 74: ...74 Chapter 5 Installing the BCM50 system N0027152 01 N0027152 01 ...
Page 96: ...96 Chapter 8 Installing an expansion unit N0027152 01 N0027152 01 ...
Page 116: ...116 Chapter 10 Installing telephones and peripherals N0027152 01 N0027152 01 ...
Page 122: ...122 Chapter 11 Installing the analog terminal adapter N0027152 01 N0027152 01 ...
Page 126: ...126 Chapter 12 Configuring the BCM50 system N0027152 01 N0027152 01 ...
Page 148: ...148 Chapter 15 Using the Startup Profile to configure parameters N0027152 01 N0027152 01 ...
Page 158: ...158 Chapter 17 Connecting the BCM50 system to the LAN and WAN N0027152 01 N0027152 01 ...
Page 168: ...168 Chapter 19 Replacing the BCM50 system components N0027152 01 N0027152 01 ...
Page 172: ...172 Chapter 20 Replacing a power supply N0027152 01 N0027152 01 ...
Page 178: ...178 Chapter 21 Replacing a main unit N0027152 01 N0027152 01 ...
Page 182: ...182 Chapter 22 Replacing a media bay module N0027152 01 N0027152 01 ...
Page 214: ...214 Appendix E DTM wiring chart N0027152 01 N0027152 01 ...
Page 220: ...220 Appendix G GATM wiring chart N0027152 01 N0027152 01 ...
Page 224: ...224 Appendix H 4x16 wiring charts N0027152 01 N0027152 01 ...
Page 240: ...240 Appendix K System region attributes N0027152 01 N0027152 01 ...
Page 246: ...246 Index N0027152 01 N0027152 01 ...