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04.18.2008 at 07:11PM PDT, ID: 23336010
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8.2

Can I  use a "summary" type CIDR address on routers, switch vlan 1 and hosts?

Asked by lcappelli in Network Design & Methodology, Network Routers, Miscellaneous Networking

Tags:

I am curious if there are any negative issues with using the following address pattern on  2960 switches, cisco routers and xp hosts.

the pattern

192,168.64.0 /23
or
192.168.64.0
255.255.254.0

I set up a host as 192.168.64.100  255.255.254.0

and a vlan 1 ip with 192.168.64.12  255.255.254.0

They could ping each othe, and I got the machines online through a proxy server and some PAT.

BUT,  are there any issues that I might get from using this pattern. I have to use it or come up with a reason not to. the pattern goes against some basic subnetting rules I have learned from CCNA studies. I understand summarization and supernetting and I am very verse in VLSM.

This 192.168.64.0 /23 pattern uses the private 192.168.0.0/16 range
This pattren has the following  properties

range  192.168.64.0  to 192.168.65.255  and seems to make available 510 host addresses

192.168.64.0  =    192.168.01000000.00000000
255.255.254.0=       N    N .11111110.00000000

Using this pattern, backwards subnetting instead of traditional subnetting? If this is ok, can you do this with public address space as well, will summarization in routing tables get messed up? Will  the no auto summary command take care of any problems?

Lots of questions BUT all basically, is using a backwards subnet mask (Class C with /23) allowed and proven or is the designer that came up with these numbers creating future problems in this design.

PS Why we did not use 10 or 172 is academic, these are the number I was given to put on the switches, etc.Start Free Trial
 
Keywords: Can I use a "summary" type CIDR ad…
Title
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2 Cisco VLAN
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4 vlan 3560
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[+][-]04.18.2008 at 10:39PM PDT, ID: 21391293

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[+][-]04.19.2008 at 08:33AM PDT, ID: 21392877

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[+][-]04.19.2008 at 11:41AM PDT, ID: 21393474

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[+][-]04.19.2008 at 12:44PM PDT, ID: 21393635

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[+][-]04.19.2008 at 12:52PM PDT, ID: 21393664

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About this solution

Zones: Network Design & Methodology, Network Routers, Miscellaneous Networking
Tags: CIDR routing switches
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Solution Provided By: giltjr
Participating Experts: 2
Solution Grade: B
 
 
[+][-]04.19.2008 at 01:00PM PDT, ID: 21393699

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