Expanding to a 23 bit subnet max instead of 24 bit.

SOLVED
Trunolimit2
Conversationalist

Expanding to a 23 bit subnet max instead of 24 bit.

I've got a site that is out of IP addresses. It would be impossible to look through 200+ devices and see what is what.

 

What are the downsides of just increasing this address space to a /23 and doubling the address pool?

 

just to give you the size and scope of the site this is a residential install with an MX100, 3 MS 320, 3 MS 225, 2 MS 120, and 2 MS42s. And several MRs 

 

We have 5 VLANs running. All /24 but our main Data VLAN is about 90 precent used. 

 

Can I just change the main VLAN to a /23 a new subnet range so that it doesn't overlap with any other VLANS?

 

Is there anything I should be aware of before making this change?

1 ACCEPTED SOLUTION

Accepted Solutions
ww
Kind of a big deal
Kind of a big deal

Re: Expanding to a 23 bit subnet max instead of 24 bit.

There is no real downside. 

 

 

In case you have only 50 devices active, but the scope is 90%full, you could also first look to decrease the dhcp leasetime f.e. if its on 1 day you can put it 8 hours 

 

In case you really have 200+ active devices i would make it a /23 and combine it with a fw upgrade.

View solution in original post

3 REPLIES 3
ww
Kind of a big deal
Kind of a big deal

Re: Expanding to a 23 bit subnet max instead of 24 bit.

There is no real downside. 

 

 

In case you have only 50 devices active, but the scope is 90%full, you could also first look to decrease the dhcp leasetime f.e. if its on 1 day you can put it 8 hours 

 

In case you really have 200+ active devices i would make it a /23 and combine it with a fw upgrade.

View solution in original post

UCcert
Kind of a big deal

Re: Expanding to a 23 bit subnet max instead of 24 bit.

Simply create a new non-overlapping subnet and start moving devices/ports over.

Darren O'Connor | uccert.co.uk
https://www.linkedin.com/in/darrenoconnor/

I'm not an employee of Cisco/Meraki. My posts are based on Meraki best practice and what has worked for me in the field.
Inderdeep
Kind of a big deal

Re: Expanding to a 23 bit subnet max instead of 24 bit.

@Trunolimit2 : I would recommend to take different and new /23 subnet and move devices.

Regards
Inderdeep Singh
www.thenetworkdna.com ( Awarded by Cisco IT Blogs award 2020)
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