
Configuring and Customizing IP
303528-A Rev 00
4-13
Allowing an All-Zero or All-One Subnet Address
By default, for IP, an address with a subnet portion of all zeros or all ones is an
illegal address.
You can configure IP to allow an all-zero and all-one subnet address. Enable this
feature with caution, however, for it can result in an ambiguous address. For
example, if an all-zero subnet address and an all-zero broadcast address are both
valid, the router cannot distinguish an all-subnets broadcast from a directed
broadcast for the zero subnet.
Using the BCC
Navigate to the IP global prompt and enter:
all-subnets enabled
For example:
ip# all-subnets enabled
ip#
Using Site Manager
Site Manager Procedure
You do this System responds
1. In the Configuration Manager window,
choose
Protocols
.
The Protocols menu opens.
2. Choose
IP
. The IP menu opens.
3. Choose
Global
. The Edit IP Global Parameters window
opens.
4. Set the
Zero Subnet Enable
parameter.
Site Manager: Zero Subnet Enable
parameter: page A-42
5. Click on
OK
. Site Manager returns you to the
Configuration Manager window.
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