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Catalyst 2940 Switch Software Configuration Guide
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Chapter 9 Configuring the Switch Interfaces
Configuring Ethernet Interfaces
Configuring Ethernet Interfaces
The switch supports these interface types:
• Physical ports—Switch ports, including access and trunk ports
• VLANs—Switch virtual interfaces (SVIs)
• Port-channels—EtherChannel of 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 9-10
• Configuring Interface Speed and Duplex Mode, page 9-11
• Configuring Auto-MDIX on an Interface, page 9-13
• Adding a Description for an Interface, page 9-14
Default Ethernet Interface Configuration
Table 9-1 shows the Ethernet interface default configuration. For more details on the VLAN parameters
listed in the table, see Chapter 13, “Configuring VLANs.” For details on controlling traffic to the port,
see Chapter 17, “Configuring Port-Based Traffic Control.”
Table 9-1 Default Ethernet Interface Configuration
Feature Default Setting
Operating mode Layer 2.
Allowed VLAN range VLANs 1 to 1005.
Default VLAN (for access ports) VLAN 1.
Native VLAN (for 802.1Q trunks) VLAN 1.
VLAN trunking Switchport mode dynamic desirable (supports DTP).
Port enable state All ports are enabled.
Port description None defined.
Speed Autonegotiate.
Duplex mode Autonegotiate.
Flow control Flow control is set to off for receive and desired for send for
Gigabit Ethernet ports.
EtherChannel (PAgP) and Link
Aggregation Control Protocol
(LACP)
Disabled on all Ethernet ports. See Chapter 25, “Configuring
EtherChannels.”
Broadcast, multicast, and unicast
storm control
Disabled.
Protected port Disabled. See the “Configuring Protected Ports” section on
page 17-4.
Port security Disabled. See the “Default Port Security Configuration” section
on page 17-7.