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madona33

changing VLan subnetmask

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Dear all,

 

I have a question about VLAN subnet mask.

 

We have 10 Vlans at work and would like to change the mask of one of them from 10.0.19.0/24 to 10.0.19.0/19 to have more clients as we are planning to use this vlan for wireless service (this vlan has never been used, so nothing is connected to it).

 

All vlans are configured in 2 cisco core switches / 3750 (main and backup)

 

Could I do this without any problems?

 

If yes, do I need to change it only in both core switches or in both and the DHCP server?

 

Many thanks in advanced.

 

Madona33

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You cannot do that, find an online subnet calculator and look at the results when you enter that IP/Mask

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