What is the application of Null0 interface?
The characteristics of Null0 interface: It does not forward or receive any communication and discard the communication sent to it.
The application of Null0 interface:
1、Null0 prevents loop.
2、For safety, null0 interface provides chosen way of filter communication. Import unwanted information to Null0 interface to avoid the use of access list.
3、It is used for load balance of BGP.
4、It can prevent route flapping.