How to distinguish the physical interface and logic (subinterface) interface to the Cisco router/Switch?

Hi Expert,

How to distinguish the physical interface and logic (subinterface) interface to the Cisco router/Switch? Can you please clarify a formal way for this so have?

A physical interface is numbered with the same name of the interface when printing on the physical port. For example "GigabitEthernet 0/1" corresponds to port 1 of the 0 module (or the base unit).

A logical interface can be a subinterface on a routed port and will have a point ("". "") preceding the number sous-interface (ex. GigabitEthernet 0/1.1). It can also be a loop or a virtual interface (on a router this could also include interfaces like the tunnel and virtual tunnel or VTI types). A switch may also have a VLAN logical interfaces (e.g. interface vlan 1) which are used as layer 3 virtual interfaces of type.

Tags: Cisco Security

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