A blackhole entry configures the switch to discard packets with a specified MAC destination address.
Blackhole entries are useful as a security measure or in special circumstances where a specific source or destination address must be discarded. Blackhole entries can be created through the CLI, or they can be created by the switch when a port‘s learning limit has been exceeded.
Blackhole entries are treated like permanent entries in the event of a switch reset or power off/on cycle. Blackhole entries are never aged out of the database.
Print
this page
Email this topic
Feedback
View PDF
Download EPUB