There is several reasons why one might want use a static route to null0. Here are a couple.
- You want to originate a summary route in BGP and you want to make sure that if a more specific exist doesn't exist in the routing table traffic will be dropped. This will also cause the BGP advertisement to be very stable since the static route to null0 will never go down.
- The static route to null0 is sometimes use to purposely drop traffic in DDOS attack scenarios.
In this case, router A would be the one using the static route to null0, not router B. So router B would forward packets to router A and router A would drop the packets if it didn't have a more specific route for that /25.
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[toc:faq]Introduction:Netdr is a tool available on a RSP720, Sup720 or
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IntroductionOSPF, being a link-state protocol, allows for every router
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