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Catalyst 2950 Desktop Switch Software Configuration Guide
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Chapter 9 Configuring the Switch Interfaces
Configuring Switch Interfaces

Default Ethernet Interface Configuration

Table 9-1 shows the E therne t in ter face default configuration. For more details on the V LAN para meter s
listed in the table, see Chapter 14, “Configuring VLA Ns.” 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 c onsists of a copp er 10/1 00/1000 po rt and a fiber-optic small form- factor plugga ble (SFP)
module slot. These ports display as a vertical column on the front panel and are labeled Uplink Port 1
and Up li nk Port 2 on the Catalyst 2950 LRE switch.
Within each po rt, yo u c an u se on ly on e of the two phys ical ports, either the SFP mod ule po rt or the
10/100/1000 port. For example, you can co nnect 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 acti ve. If the SFP module is plugged in later (e ven af ter the copper medium esta blishes
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 VL AN rang e VLANs 1 to 10 05 with the SI inst alle d or 1 to 4094 wi th th e EI
installed.
Default VLAN (for access ports) VLAN 1.
Native VLAN ( for 80 2.1Q tru nks) VLAN 1 .
VLAN trun king Switchp ort mode dy namic desi rable (supp orts DTP).
Port enable state All ports are enabled.
Port d escr iption None de fined.
Speed Autonegotiate.
Dupl ex mode Auton egotiate.
Flow control Flow control is set to off for receive an d desired for send for
Gigabit Ethern et ports .
EtherChannel (PAgP) Disabled on all Ethernet ports. See Chapter 27, “Configuri ng
EtherChannels.”
Broadcast, multicast, and unicast
storm cont rol D i sab le d. Se e t h e “Default Storm Control Configuration” section
on page 18-2.
Protecte d port Disab led. Se e t he “Co nfiguring Pr ote cted 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 de fault .