> # Interface Subnet Requirements

> Gigabit Ethernet interfaces (major), subinterfaces (VLAN ID), and management interfaces (mgmt 0) can be configured in the same or different subnet depending on the configuration (see Table 6-1).

> Table 6-1 Subnet Requirements for Interfaces
> Interface 1 | Interface 2 | Same Subnet Allowed | Notes
> --- | --- | --- | ---
> Gigabit Ethernet 1/1 | Gigabit Ethernet 1/2 | Yes | Two major interfaces can be configured in the same or different subnets.
> Gigabit Ethernet 1/1.100 | Gigabit Ethernet 1/2.100 | Yes | Two subinterfaces with the same VLAN ID can be configured in the same or different subnets.
> Gigabit Ethernet 1/1.100 | Gigabit Ethernet 1/2.200 | No | Two subinterfaces with different VLAN IDs cannot be configured in the same subnet.
> Gigabit Ethernet 1/1 | Gigabit Ethernet 1/1.100 | No | A subinterface cannot be configured on the same subnet as the major interface.
> mgmt0 | Gigabit Ethernet 1/1.100 | No | The mgmt0 interface cannot be configured in the same subnet as the Gigabit Ethernet interfaces or subinterfaces.
> mgmt0 | Gigabit Ethernet 1/1 | No

> Note The configuration requirements in Table 6-1 also apply to Ethernet PortChannels.

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