From: Andrew (arousch@xxxxxxxx)
Date: Mon Jul 31 2000 - 12:04:59 GMT-3
Null interfaces used to be process switched (obvious drawback) while
loopbacks were fast switched. Now, they are both fast switched.
At 07:39 AM 7/31/00 -0700, Kevin M. Woods wrote:
>I would think this is only true because loopbacks don't send ICMP
>unreachables,
>thus a performance improvement. Adding "no ip unreachables" to null0 probably
>makes them equivalent.
>
>Kevin
>
>// Typically, I have seen black hole routes configured as:
>//
>// ip route 10.0.0.0 255.0.0.0 null0
>//
>// Recently, I read somewhere that if you point them to a loopback you
>will get
>// better performance.
>//
>// ip route 10.0.0.0 255.0.0.0 lo0
>//
>// Unfortunately, I have lost the reference. Does anyone agree with this, and
>// if so, can you explain the details as to why?
>//
>// Thanks for any information!
>// Cheryl
>
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