Configuring Ethernet Interfaces; Default Ethernet Interface Configuration - Cisco WS-C3560-48PS-S Software Configuration Manual

Chapter 10 Configuring Interface Characteristics

Configuring Ethernet Interfaces

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
to Layer 2 interfaces. For more details on the VLAN parameters listed in the table, see
"Configuring VLANs."
Port-Based Traffic Control."
Note To configure Layer 2 parameters, if the interface is in Layer 3 mode, you must enter the switchport
interface configuration command without any parameters to put the interface into Layer 2 mode. This
shuts down the interface and then re-enables it, which might generate messages on the device to which
the interface is connected. Furthermore, when you use this command to put the interface into Layer 2
mode, you are deleting any Layer 3 characteristics configured on the interface.
Table 10-1 Default Layer 2 Ethernet Interface Configuration
Feature
Operating mode
Allowed VLAN range
Default VLAN (for access ports)
Native VLAN (for 802.1Q trunks) VLAN 1 (Layer 2 interfaces only).
VLAN trunking
Port enable state
Port description
Speed
Duplex mode
Flow control
EtherChannel (PAgP)
Port blocking (unknown multicast
and unknown unicast traffic)
78-16156-01
Default Ethernet Interface Configuration, page 10-11
Configuring Interface Speed and Duplex Mode, page 10-12
Configuring IEEE 802.3X Flow Control, page 10-14
Configuring Auto-MDIX on an Interface, page 10-15
Configuring Power over Ethernet on an Interface, page 10-16
Adding a Description for an Interface, page 10-18
shows the Ethernet interface default configuration, including some features that apply only
For details on controlling traffic to the port, see
Default Setting
Layer 2 or switching mode (switchport command).
VLANs 1 – 4094.
VLAN 1 (Layer 2 interfaces only).
Switchport mode dynamic auto (supports DTP)
(Layer 2 interfaces only).
All ports are enabled.
None defined.
Autonegotiate.
Autonegotiate.
Flow control is set to receive: off. It is always off for sent packets.
Disabled on all Ethernet ports. See
EtherChannels."
Disabled (not blocked) (Layer 2 interfaces only). See the
"Configuring Port Blocking" section on page
Catalyst 3560 Switch Software Configuration Guide
Configuring Ethernet Interfaces
Chapter 12,
Chapter 20, "Configuring
Chapter 29, "Configuring
20-6.
10-11