Configuring Ethernet Interfaces; Default Ethernet Interface Configuration - Cisco Catalyst 2950 Software Configuration Manual

Chapter 10 Configuring Interface Characteristics

Configuring Ethernet Interfaces

The switch supports these interface types:
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These sections describe the default interface configuration and the optional features that you can
configure on most physical interfaces:
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Default Ethernet Interface Configuration

Table 10-1
listed in the table, see
see
Table 10-1
Feature
Operating mode
Allowed VLAN range
Default VLAN (for access ports)
Native VLAN (for IEEE 802.1Q
trunks)
VLAN trunking
Port enable state
Port description
Speed
Duplex mode
Flow control
EtherChannel (PAgP) and Link
Aggregation Control Protocol (LACP)
Port blocking—unknown multicast and
unknown unicast traffic (Catalyst 2950
LRE switches only)
78-11380-12
Physical ports—Switch ports, including access and trunk ports
Port channels—EtherChannel of interfaces
VLANs
Default Ethernet Interface Configuration, page 10-9
Configuring Interface Speed and Duplex Mode, page 10-10
Configuring Media Types for Gigabit Ethernet Interfaces on LRE Switches, page 10-13
Configuring IEEE 802.3z Flow Control on Gigabit Ethernet Ports, page 10-13
Adding a Description for an Interface, page 10-15
Configuring Loopback Detection, page 10-15
shows the Ethernet interface default configuration. For more details on the VLAN parameters
Chapter 16, "Configuring VLANs."
Chapter 21, "Configuring Port-Based Traffic Control."
Default Ethernet Interface Configuration
For details on controlling traffic to the port,
Default Setting
Layer 2.
VLANs 1 to 1005 with the SI installed or 1 to 4094 with the
EI installed.
VLAN 1.
VLAN 1.
Switchport mode dynamic desirable (supports DTP).
All ports are enabled.
None defined.
Autonegotiate.
Autonegotiate.
Flow control is set to off for receive and desired for send for
Gigabit Ethernet ports.
Disabled on all Ethernet ports. See
EtherChannels."
Disabled (not blocked). See the
section on page 21-5.
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
Configuring Ethernet Interfaces
Chapter 30, "Configuring
"Configuring Port Blocking"
10-9