Route summarization with class C's

From: Tim Medley (tim.medley@ireadyworld.com)
Date: Mon Oct 07 2002 - 13:16:58 GMT-3

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I'm having a couple of issues with summarizing some class C subnets. I
was thinking that the matching bits needed to be in the same subnet
class. I think I have this worked out correctly but I need someone to
verify for me.

130.10.32.0 /28
130.10.32.16 /28

If I convert to binary I get:

10000010.00001010.00101010.00000000

10000010.00001010.00101010.00010000

To right most matching significant bits are:

10000010.00001010.00101010.00000000

10000010.00001010.00101010.00010000

So my summary route would be 130.10.32.0 255.255.254.0

Is this correct?

Example 2

130.10.42.0 /26
130.10.42.64 /26

Tim Medley, CCNP+Voice, CCDP, CWNA
Sr. Network Architect
VoIP Group
iReadyWorld

p 704.943.3615
f 704.588.2826

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