multiple subnets to the same VLAN

[Stephen Sisson]

Hello,

We have multiple networks on multiple Cisco switches all using Vlan 1, we need one network to talk with another and ok to add multiple subnets to the 1 Vlan or any Vlan?

Thank you

[John Blakley · Accepted solution]

You can have multiple subnets on the same vlan interface. You'd mark them as secondary ip addresses.

int vlan 1

ip addre 192.168.1.1 255.255.255.0

ip address 192.168.2.1 255.255.255.0 secondary

ip address 192.168.3.1 255.255.255.0 secondary

Although, it's not best practice because typically you'd want one subnet per vlan but this works in a pinch.

HTH,

John

[Stephen Sisson]

Thank you