Mask problem Switch SG300-28 30

I seem to have a problem using a 30 mask my SG300-28 switch L3 mode.  I want to isolate my router in one VLAN separated.  I had one VLAN created with a 24 mask and it seems to work.  I tried to change the mask on the switch and the router at 30.  There is no DHCP on this VLAN.  I cannot ping either side of the switch or router.  In the configuration screen to assign the IP address to the VLAN there you can use a mask from 8 to 30.  When I change the 30 to a 24, it works very well.

I use a configuration access port for VLAN router.

Using a VLAN and an access port is perfectly fine.  There should be nothing wrong with that.

I don't know if this switch supports, but you might be able to do a "no switchport" and then put the IP address on the interface.

Tags: Cisco Support

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