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Configuring Interface Characteristics
Interface Configuration Mode
In the following configuration example, when Host A in VLAN 20 sends data to Host B in VLAN 30, the data must go from Host A to the switch, to the router, back to the switch, and then to Host B.
Figure 1: Connecting VLANs with the Switch
With a standard Layer 2 switch, ports in different VLANs have to exchange information through a router.
Interface Configuration Mode
The switch supports these interface types:
•Physical ports—switch ports and routed ports
•VLANs—switch virtual interfaces
•Port channels—EtherChannel interfaces
You can also configure a range of interfaces.
To configure a physical interface (port), specify the interface type, stack member number, module number, and switch port number, and enter interface configuration mode.
•Type—Gigabit Ethernet (gigabitethernet or gi) for 10/100/1000 Mb/s Ethernet ports, or small form-factor pluggable (SFP) module Gigabit Ethernet interfaces (gigabitethernet or gi).
•Stack member number—The number that identifies the switch within the stack. The range is 1 to 8 for a stack of Catalyst 2960-X switches, and 1 to 4 for a mixed stack of Catalyst 2960-X and Catalyst 2960-S switches. The switch number is assigned the first time the switch initializes. The default switch number, before it is integrated into a switch stack, is 1. When a switch has been assigned a stack member number, it keeps that number until another is assigned to it.
You can use the switch port LEDs in Stack mode to identify the stack member number of a switch.
•Module number—The module or slot number on the switch (always 0).
•Port number—The interface number on the switch. The 10/100/1000 port numbers always begin at 1, starting with the far left port when facing the front of the switch, for example, gigabitethernet1/0/1 or
Catalyst 2960-X Switch Interface and Hardware Component Configuration Guide, Cisco IOS Release 15.0(2)EX
