10-11
Catalyst 3550 Multilayer Switch Software Configuration Guide
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Chapter 10 Configuring Interface Characteristics
Configuring Ethernet Interfaces
• The VLAN interfaces (SVIs) must have been configured with the interface vlan command. The
show running-config privileged EXEC command displays the configured VLAN interfaces. VLAN
interfaces not displayed by the show running-config command cannot be used as interface-ranges.
• All interfaces in a range must be the same type; that is, all Fast Ethernet ports, all Gigabit Ethernet
ports, all EtherChannel ports, or all VLANs, but you can combine multiple interface types in a
macro.
This example shows how to define an interface-range macro named enet_list to select Fast Ethernet ports
1 to 4 and to verify the macro configuration:
Switch# configure terminal
Switch(config)# define interface-range enet_list fastethernet0/1 - 4
Switch(config)# end
Switch# show running-config | include define
define interface-range enet_list FastEthernet0/1 - 4
This example shows how to create a multiple-interface macro named macro1:
Switch# configure terminal
Switch(config)# define interface-range macro1 gigabitethernet0/1 - 2, fastethernet0/5 - 7
Switch(config)# end
Switch#
This example shows how to enter interface range configuration mode for the interface-range macro
enet_list:
Switch# configure terminal
Switch(config)# interface range macro enet_list
Switch(config-if-range)#
This example shows how to delete the interface-range macro enet_list and to verify that it has been
deleted.
Switch# configure terminal
Switch(config)# no define interface-range enet_list
Switch# show run | include define
Configuring Ethernet Interfaces
These sections describe the default interface configuration and the optional features that you can
configure on most physical interfaces:
• Default Ethernet Interface Configuration, page 10-12
• Configuring Interface Speed and Duplex Mode, page 10-13
• Configuring IEEE 802.3X Flow Control, page 10-15
• Adding a Description for an Interface, page 10-17
Caution If the interface is in Layer 3 mode, after entering interface configuration mode, you must enter the
switchport interface configuration command without any parameters to put the interface into Layer 2
mode. This shuts down the interface and then re-enables it, which might generate messages on the device
to which the interface is connected. Furthermore, when you use this command to put the interface into
Layer 2 mode, you are deleting any Layer 3 characteristics configured on the interface.
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