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Cisco IOS in a Nutshell, 2nd Edition by James Boney

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Name

ip subnet-zero — global

Synopsis

ip subnet-zero
no ip subnet-zero

Configures

The zero subnet

Default

Enabled in recent versions of IOS (12.X)

Description

When subnetting a network, the 0 subnet (the subnet whose subnet bits are all 0) is normally not allowed because of potential confusion between the subnet address and the network address. In practice, this confusion is rarely an issue. This command allows the router to use the all-zeros subnet.

Example

The following command enables the zero subnet:

ip subnet-zero

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