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9-10
Catalyst 2950 Desktop Switch Software Configuration Guide
78-14982-01
Chapter 9 Configuring the Switch Interfaces
Configuring Switch Interfaces
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 14, “Configuring VLANs.” For details on controlling traffic to the port,
see Chapter 18, “Configuring Port-Based Traffic Control.”
SFP Configuration
The Catalyst 2950 LRE switch has four physical input ports that are logically bundled as two ports. Each
logical port consists of a copper 10/100/1000 port and a fiber-optic small form-factor pluggable (SFP)
module slot. These ports display as a vertical column on the front panel and are labeled Uplink Port 1
and Uplink Port 2 on the Catalyst 2950 LRE switch.
Within each port, you can use only one of the two physical ports, either the SFP module port or the
10/100/1000 port. For example, you can connect to either the SFP module port or the 10/100/1000 port
under Uplink Port 1. The default operation is that if the SFP module is plugged in, the fiber-optic
medium has the priority over copper medium. If the SFP module is not plugged in, then the copper
medium becomes active. If the SFP module is plugged in later (even after the copper medium establishes
the link), then the link of the copper medium will be disconnected and the fiber-optic medium will
Table 9-1 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) Disabled on all Ethernet ports. See Chapter 27, “Configuring
EtherChannels.”
Broadcast, multicast, and unicast
storm control
Disabled. See the “Default Storm Control Configuration” section
on page 18-2.
Protected port Disabled. See the “Configuring Protected Ports” section on
page 18-3.
Port security Disabled. See the “Default Port Security Configuration” section
on page 18-7.
Port Fast Disabled.
Media Type Media type is set to prefer-sfp by default.