Bgp blackhole11/17/2023 ![]() In fact, this is what happened with the Pakistani ISP and YouTube’s data. Obviously, you can direct traffic that you want to get rid of to a black hole. Thus, the null interface on the Cisco router is the “black hole.” How can a black hole route help you? When traffic goes to that interface, the router just discards it. In computers and networking, however, null doesn’t mean zero it means no value or nothing.Ī Cisco IOS router also has an interface called null0. In mathematics, null means to have zero numbers in a set. ![]() The classic interface used on a Cisco router to do this is the null0 interface. In its simplest form, a black hole exists on a network when a router directs network traffic to a destination that just “throws away” the traffic. In the world of IP routing, a black hole is also a term with a negative connotation - trust me, no one wants traffic going there either. It was a scary thing that all the characters wanted to avoid. In the 1979 movie The Black Hole, what went into the black hole didn’t come out. Associated Press: Pakistan Causes Worldwide YouTube Outage.Network World: YouTube outage underscores big Internet problem.: How Pakistan knocked YouTube offline (and how to make sure it never happens again). ![]() But if you need a quick review, check out these resources: Because plenty of articles are available that discuss the incident, I won’t go into detail. If you haven’t already heard what happened with the YouTube incident, it’s a very interesting story from an IP routing and troubleshooting perspective. That’s why you should understand what a black hole route is, how it can help you - and how it could hurt you. While you may not have a network as large or as critical as YouTube to manage, unexpected network downtime or lost network traffic is never a good thing. That mistake involved a black hole route accidentally distributed around the world. The entire YouTube network recently went down, across the globe, for about two hours - thanks to a mistake made by an ISP in Pakistan. That's why you should understand what a black hole route is, how it can help you - and how it could hurt you. Black hole routes: The good, the bad, and the ugly
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