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HP A3100-8 v2 SI Configuration Manual: Null Interface; Introduction To Null Interface; Configuring Null 0 Interface

A3100 v2 switch series layer 2 - lan switching.
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To do...
Restore the default settings for the
interface
NOTE:
You can configure settings such as IP addresses and IP routes on loopback interfaces. For more
information, see the
Guide
.

Null interface

Introduction to null interface

A null interface is a completely software-based logical interface, and is always up. However, you cannot
use it to forward data packets or configure an IP address or link-layer protocol on it. With a null interface
specified as the next hop of a static route to a specific network segment, any packets routed to the
network segment are dropped. The null interface provides a simpler way to filter packets than ACL. You
can filter uninteresting traffic by transmitting it to a null interface instead of applying an ACL.
For example, by executing the ip route-static 92.101.0.0 255.255.0.0 null 0 command (which configures
a static route that leads to null interface 0), you can have all the packets destined to the network segment
92.101.0.0/16 discarded.
Only one null interface, Null 0, is supported on your switch. You cannot remove or create a null interface.

Configuring null 0 interface

Follow these steps to enter null interface view:
To do...
Enter system view
Enter null interface view
Set a description for the
null interface
Restore the default settings
of the interface
Use the command...
default
Layer 3—IP Services Configuration Guide
Use the command...
system-view
interface null 0
description text
default
Remarks
Optional
Layer 3—IP Routing Configuration
and
Remarks
Required
The Null 0 interface is the default null interface
on your switch. It cannot be manually created or
removed.
Optional
By default, the description of an interface is the
interface name followed by the "Interface"
string.
Optional
15

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