Specifications

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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
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Chapter 11 Configuring the Switch Interfaces
Configuring Switch 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 11-10
• Configuring Interface Speed and Duplex Mode, page 11-11
• Configuring IEEE 802.3X Flow Control on Gigabit Ethernet Ports, page 11-13
• Adding a Description for an Interface, page 11-15
Default Ethernet Interface Configuration
Table 11-1 shows the Ethernet interface default configuration. For more details on the VLAN parameters
listed in the table, see Chapter 15, “Configuring VLANs.” For details on controlling traffic to the port,
see Chapter 19, “Configuring Port-Based Traffic Control.”
Table 11-1 Default Ethernet Interface Configuration
Feature Default Setting
Operating mode Layer 2.
Allowed VLAN range VLANs 1 to 1005 with the SI installed or 1 to 4094 with the EI
installed.
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 28, “Configuring
EtherChannels.”
Broadcast, multicast, and unicast
storm control
Disabled. See the “Default Storm Control Configuration” section
on page 19-2.
Protected port Disabled. See the “Configuring Protected Ports” section on
page 19-3.
Port security Disabled. See the “Default Port Security Configuration” section
on page 19-6.
Port Fast Disabled.