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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
Step
Enter system view.
1.
Enter null interface
2.
view.
Set the interface
3.
description.
Restore the default
4.
settings for the null
interface.
Displaying and maintaining loopback and null
interfaces
Task
Display information about
loopback interfaces.
Command
system-view
interface null 0
description text
default
Command
display interface [ loopback ] [ brief [ down |
description ] ] [ | { begin | exclude | include }
regular-expression ]
display interface loopback 0 [ brief
[ description ] ] [ | { begin | exclude | include }
regular-expression ]
16
Remarks
N/A
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 a null interface is
interface name Interface.
Optional
Remarks
Available in any view
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