Cisco Systems 2960 Using Interface Configuration Mode

10-4
Catalyst 2960 Switch SoftwareConfiguration Guide
78-16881-01
Chapter10 Configuring Interface Characteristics
Using Interface Configuration Mode
Dual-Purpose Uplink Ports
Some Catalyst 2960 switches support dual-purpose uplink ports. Each uplink port is considered as a
single interface with dual front ends (an RJ-45 connector and an SFP module connector). The dual front
ends are not redundant interfaces, and the switch activates only one connector of the pair.
By default, the switch dynamically selects the interface type that first links up. However, you can use the
media-type interface configuration command to manually select the RJ-45 connector or the SFP module
connector. For information about configuring speed and duplex settings for a dual-purpose uplink, see
the “Setting the Type of a Dual-Purpose Uplink Port” section on page 10-11.
Each uplink port has two LEDs: one shows the status of the RJ-45 port and one shows the status of the
SFP module port. The port LED is on for whichever connector is active. For more information about the
LEDs, see the hardware installation guide.
Connecting Interfaces
Devices within a single VLAN can communicate directly through any switch. Ports in different VLANs
cannot exchange data without going through a routing device. In the configuration shown in Figure 10-1,
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.
Figure10-1 Connecting VLANs with Layer 2 Switches
Using Interface Configuration Mode
The switch supports these interface types:
•Physical ports—switch ports
•VLANs—switch virtual interfaces
•Port channels—EtherChannel interfaces
You can also configure a range of interfaces (see the “Configuring a Range of Interfaces” section on
page 10-6).
Host A
Switch
Cisco router
VLAN 20
Host B
VLAN 30
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