From: Ralph Sherry (yodajedi6678@yahoo.com)
Date: Thu May 26 2005 - 20:49:34 GMT-3
I have been doing some playing with Prefix lists and find them a bit confusing. One of the things that I have been playing with in the lab is trying to block different routes from different ranges of IP address. Here is one of the examples that I have tried where the goal is to block all class C address space.
ip prefix-list cisco seq 10 deny 224.0.0.0/3 ge 3
ip prefix-list cisco seq 20 permit 192.0.0.0/2 ge 2
ip prefix-list cisco seq 30 deny 128.0.0.0/1 le 32
The way I read this code would be the first line blocks all IP address space from 240.0.0.0 and above. The second line would would permit the actual Class C address space. the last line would take care of the A address space. Does this scenario make sense?
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