Avaya BCM 4.0 Networking Przewodnik Konfiguracji Strona 594

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594 Chapter 65 Configuring DHCP
N0060606N0060606
If you configured the DHCP mode for DHCP Server, then configure the LAN scope attributes as
follows. If the DHCP mode is DHCP RelayAgent refer to “LAN settings for DHCP Relay Agent”
on page 607.
Configuring Address ranges for a Local Scope
Address ranges allow you to specify the valid IP addresses for the DHCP clients.
By default, the DHCP server on the BCM will have to configure a range of IP addresses to supply
the IP Sets. It defaults to use the top 60% of a subnet. For example, if an external DHCP server
supplies the following IP address to the BCM: 177.218.21.45 with a subnet of 255.255.255.0, then
the DHCP server will configure itself to reserve the following range
177.218.21.100-177.218.21.254. If the IP address of the subnet falls inside the factory default
range or the maximum hosts that can be supported is less than 254, then the maximum range which
can fit and excludes the IP address of the subnet will be chosen.
Example:
IP address 177.218.21.145 with a subnet of 255.255.255.0
The following range is reserved 177.218.21.1 - 177.218.21.144
IP address 177.218.21.145 with a subnet 255.255.255.192
The following range is reserved 177.218.21.146 - 177.281.21.190
This default can be checked and changed using Element Manager.
Note: If your BCM system has multiple LAN interfaces, you can see multiple DHCP
scopes under DHCP. They are named LAN1 and LAN2. This section describes
configuring DHCP for LAN1. Follow the same instructions to configure the parameters
for LAN2.
Note: When DNS is disabled in BCM, the DNS Server box must be set to the IP address
of a remote DNS server.
Warning: Whenever you make changes to the address range, the DHCP
server may become unavailable to clients for a brief period of time. When
making changes, consider doing so at a time that will minimize the effect
on users.
Note: You must add at least one Address range to use DHCP server.
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