R3303-HP HSR6800 Routers Interface Configuration Guide

88
You can configure settings such as IP addresses and IP routes on loopback interfaces. For more
information, see Layer 3—IP Services Configuration Guide and Layer 3—IP Routing Configuration
Guide.
Configuring a null interface
Introduction
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 leading 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 device. You cannot remove or create a null
interface.
Configuration procedure
To enter null interface view:
Ste
p
Command Remarks
1. Enter system view.
system-view
N/A
2. Enter null interface
view.
interface null 0
The Null 0 interface is the default null interface
on your device. It cannot be manually created
or removed.
3. Set the interface
description.
description text
Optional.
By default, the description of a null interface is
interface name Interface.
4. Set the intended
bandwidth for the null
interface.
bandwidth bandwidth-value Optional.
Displaying and maintaining loopback and null
interfaces