Re: Minimal Number of Statements

From: Ed Lui (edwlui@gmail.com)
Date: Tue Mar 15 2005 - 12:40:11 GMT-3

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deny 210.16.1.0 0.3.0.0
deny 210.20.1.0 0.0.0.0
deny 210.30.1.0 0.1.0.0
permit any

Still need 4 lines :(

-- 
Edward 
(A+, Net+, MCP, MCP+I, MCSE, CCNA, CCNP)
On Mon, 14 Mar 2005 15:02:30 -0500, gladston@br.ibm.com
<gladston@br.ibm.com> wrote:
> What would you use as a minimal number of statements to achieve the follwing result?
> 
> Before any filtering, R6 receives these routes:
> 
> r6#sir ei
> D    210.16.1.0/24 [90/2297856] via 150.100.16.1, 00:00:50, Serial0
> D    210.17.1.0/24 [90/2297856] via 150.100.16.1, 00:00:50, Serial0
> D    210.18.1.0/24 [90/2297856] via 150.100.16.1, 00:00:50, Serial0
> D    210.19.1.0/24 [90/2297856] via 150.100.16.1, 00:00:50, Serial0
> D    210.20.1.0/24 [90/2297856] via 150.100.16.1, 00:00:50, Serial0
> D    210.21.1.0/24 [90/2297856] via 150.100.16.1, 00:00:50, Serial0
> D    210.23.1.0/24 [90/2297856] via 150.100.16.1, 00:00:50, Serial0
> D    210.22.1.0/24 [90/2297856] via 150.100.16.1, 00:00:50, Serial0
> D    210.25.1.0/24 [90/2297856] via 150.100.16.1, 00:00:50, Serial0
> D    210.24.1.0/24 [90/2297856] via 150.100.16.1, 00:00:50, Serial0
> D    210.27.1.0/24 [90/2297856] via 150.100.16.1, 00:00:50, Serial0
> D    210.26.1.0/24 [90/2297856] via 150.100.16.1, 00:00:50, Serial0
> D    210.29.1.0/24 [90/2297856] via 150.100.16.1, 00:00:50, Serial0
> D    210.28.1.0/24 [90/2297856] via 150.100.16.1, 00:00:50, Serial0
> D    210.29.1.0/24 [90/2297856] via 150.100.16.1, 00:00:50, Serial0
> D    210.30.1.0/24 [90/2297856] via 150.100.16.1, 00:00:50, Serial0
> D    210.31.1.0/24 [90/2297856] via 150.100.16.1, 00:00:50, Serial0
> 
> Make a filter with the minimal number of statements to allow in just these routes:
> 
> D    210.21.1.0/24 [90/2297856] via 150.100.16.1, 00:00:50, Serial0
> D    210.23.1.0/24 [90/2297856] via 150.100.16.1, 00:00:50, Serial0
> D    210.22.1.0/24 [90/2297856] via 150.100.16.1, 00:00:50, Serial0
> D    210.25.1.0/24 [90/2297856] via 150.100.16.1, 00:00:50, Serial0
> D    210.24.1.0/24 [90/2297856] via 150.100.16.1, 00:00:50, Serial0
> D    210.27.1.0/24 [90/2297856] via 150.100.16.1, 00:00:50, Serial0
> D    210.26.1.0/24 [90/2297856] via 150.100.16.1, 00:00:50, Serial0
> D    210.29.1.0/24 [90/2297856] via 150.100.16.1, 00:00:50, Serial0
> D    210.28.1.0/24 [90/2297856] via 150.100.16.1, 00:00:50, Serial0
> D    210.29.1.0/24 [90/2297856] via 150.100.16.1, 00:00:50, Serial0
> 
> The minimal number I got is four statements:
> 
> permit 210.21.1.0
> permit 210.22.1.0 0.1.0.0
> permit 210.24.1.0 0.3.0.0
> permit 210.28.1.0 0.1.0.0
> 
> Any other idea?
> 
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