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Cisco IOS in a Nutshell, 2nd Edition
book

Cisco IOS in a Nutshell, 2nd Edition

by James Boney
August 2005
Intermediate to advanced content levelIntermediate to advanced
798 pages
31h 12m
English
O'Reilly Media, Inc.
Content preview from Cisco IOS in a Nutshell, 2nd Edition

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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Publisher Resources

ISBN: 0596008694Errata