[c-nsp] VLSM

[Michael Smith]

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> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of Shaun
> Sent: Monday, January 10, 2005 3:19 PM
> To: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] VLSM
> 
> Maybe i wasnt clear about what VLSM is or does.
> 
> It's my understanding that you usually take a /24 and carve it up
> into a number of equal subnets. (ex: /24 cut into 8 /27's).  I was
> asking on efnet
> in #ciscohelp if it was possible to carve a /24 up into multiple
> CIDR's (ex:
> /29's /28's /27's etc).  They said yes and pointed me to VLSM but
> they did not recommend that i do this.
> 
> So my question is, if it is possble and proper can i carve a /24 up
> into diffrent CIDR's or should i stick with carving it up into
> equal subnets.  
> 
> ~Shaun
> 
You can and should carve it up into the sizes that most match your
need.  You just have to be cognizant of bit boundaries.  2 /30's == 1
/29, 2 /29's == /28, etc.  If you provision a /30, you will have
another /30 next to it.  You can just provision the /29 next to the
/30.

Example:

Good

192.168.1.0/30
192.168.1.4/30
192.168.1.8/29 

Bad

192.168.1.0/30
192.168.1.4/29

Mike

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