18
NOTE:
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 to the 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.
Configuration procedure
Ste
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 switch. 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. Restore the default
settings for the null
interface.
default Optional
Displaying and maintaining loopback and null
interfaces
Task Command
Remarks
Display information about
loopback interfaces.
display interface [ loopback ] [ brief [ down ] ] [ |
{ begin | exclude | include } regular-expression ]
display interface loopback interface-number [ brief ]
[ | { begin | exclude | include } regular-expression ]
Available in any view
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