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Configure Basic Functions of Null Interface

Configuration Condition

No

Configure Basic Functions of Null Interface

Table 6–2 Configure basic functions of Null interface

Step

Command

Description

Enter the global configuration mode

configure terminal

-

Enter Null interface configuration mode

interface null 0

Mandatory

Configure prohibiting sending the error packet of ICMP unreachable no ip unreachables

Optional
By default, prohibit sending the error packet of ICMP unreachable.

note


  • Null interface just supports configuring permitting or prohibiting sending the error packet of ICMP unreachable.
  • The packet reaching Null interface is dropped and it is not necessary to send the error of ICMP unreachable.