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Chapter7 Configuring Interface Characteristics
Using the Interface Command
recognize the physical ports within the portgroup. Exceptions are the DTP, the Cisco Discovery
Protocol (CDP), the Port Aggregation Protocol (PAgP), and Link Aggregation Control Protocol (LACP)
which operate only on physical ports.
When you configure an EtherChannel, you create a port-channe l logical interface and assign an interface
to the EtherChannel. For Layer 2 interfaces, the logical interface is dynamically created. You manually
assign an interface to the EtherChannel by using the channel-group interface configuration command.
This command binds the physical and logical ports togeth er. For more information, see Chapter 24,
“Configuring EtherChannels and Layer 2 Trunk Failover.”
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 or routed interface.
With a standard Layer 2 switch, ports in different VLANs have to exchange infor mation through a
router. In the configuration shown in Figure 7-1, when Host A in VLAN 20 sends data t o Host B in
VLAN 30, it must go from Host A to the switch, to the router, back to the switch, and then to Host B.
Figure7-1 Connecting VLANs with Layer 2 Switches
Using the Interface CommandTo configure a physical interface (port), use the interface global configuration command to enter interface
configuration mode and to specify the interface type, slot, and number.
•Type—Fast Ethernet (fastethernet or fa) for 10/100 Ethernet or Gigabit Ethernet (gigabitethernet or
gi) Each switch platform supports different types of interfaces. To display a complete list of the
interface types supported on your switch, use the interface ? global configuration command.
•Slot—The slot number on the switch (always 0 on this switch).
•Port number—The interface number on the switch. The port numbers always begin at 1, starting
with the leftmost port when facing the front of the switch , for example, fastethernet0/1,
fastethernet0/2. If there is more than one interface type (for example, 10/100 ports and Gigabit
BladeCenter
Cisco router
VLAN 20 VLAN 30
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VLAN 20
VLAN 20
VLAN 30
VLAN 30