Minimal Number of Statements

From: gladston@br.ibm.com
Date: Mon Mar 14 2005 - 17:02:30 GMT-3

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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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