Cisco 3750G - Catalyst Integrated Wireless LAN Controller Configuration Manual page 316

Configuring Ethernet Interfaces
To configure Layer 2 parameters, if the interface is in Layer 3 mode, you must enter the switchport
Note
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. When you put an interface that is in Layer 3 mode into Layer 2 mode, the
previous configuration information related to the affected interface might be lost, and the interface is
returned to its default configuration.
Table 11-2
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)
Port blocking (unknown multicast
and unknown unicast traffic)
Broadcast, multicast, and unicast
storm control
Protected port
Port security
Port Fast
Auto-MDIX
Power over Ethernet (PoE)
Keepalive messages
Catalyst 3750 Switch Software Configuration Guide
11-16
Default Layer 2 Ethernet Interface Configuration
Default Setting
Layer 2 or switching mode (switchport command).
VLANs 1 to 4094.
VLAN 1 (Layer 2 interfaces only).
VLAN 1 (Layer 2 interfaces only).
Switchport mode dynamic auto (supports DTP) (Layer 2 interfaces
only).
All ports are enabled.
None defined.
Autonegotiate. (Not supported on the 10-Gigabit interfaces.)
Autonegotiate. (Not supported on the 10-Gigabit interfaces.)
Flow control is set to receive: off. It is always off for sent packets.
Disabled on all Ethernet ports. See
EtherChannels and Link-State Tracking."
Disabled (not blocked) (Layer 2 interfaces only). See the
"Configuring Port Blocking" section on page
Disabled. See the
on page
Disabled (Layer 2 interfaces only). See the
Ports" section on page
Disabled (Layer 2 interfaces only). See the
Configuration" section on page
Disabled. See the
Configuration" section on page
Enabled.
Note
Enabled (auto).
Disabled on SFP module ports; enabled on all other ports.
Chapter 11
"Default Storm Control Configuration" section
25-3.
25-5.
25-10.
"Default Optional Spanning-Tree
20-12.
The switch might not support a pre-standard powered
device—such as Cisco IP phones and access points that do
not fully support IEEE 802.3af—if that powered device is
connected to the switch through a crossover cable. This is
regardless of whether auto-MIDX is enabled on the switch
port.
Configuring Interface Characteristics
Chapter 34, "Configuring
25-7.
"Configuring Protected
"Default Port Security
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