Cisco Systems 3750E ユーザーズマニュアル
11-21
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02
Chapter 11 Configuring Interface Characteristics
Configuring Ethernet Interfaces
Default Ethernet Interface Configuration
shows the Ethernet interface default configuration, including some features that apply only
to Layer 2 interfaces. For more details on the VLAN parameters listed in the table, see
For details on controlling traffic to the port, see
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. 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.
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 11-3
Default Layer 2 Ethernet Interface Configuration
Feature
Default Setting
Operating mode
Layer 2 or switching mode (switchport command).
Allowed VLAN range
VLANs 1– 4094.
Default VLAN (for access ports)
VLAN 1 (Layer 2 interfaces only).
Native VLAN (for IEEE 802.1Q
trunks)
trunks)
VLAN 1 (Layer 2 interfaces only).
VLAN trunking
Switchport mode dynamic auto (supports DTP) (Layer 2 interfaces
only).
only).
Port enable state
All ports are enabled.
Port description
None defined.
Speed
Autonegotiate. (Not supported on the 10-Gigabit interfaces.)
Duplex mode
Autonegotiate. (Not supported on the 10-Gigabit interfaces.)
Flow control
Flow control is set to receive: off. It is always off for sent packets.
EtherChannel (PAgP)
Disabled on all Ethernet ports. See
Port blocking (unknown multicast
and unknown unicast traffic)
and unknown unicast traffic)
Disabled (not blocked) (Layer 2 interfaces only). See the
.
Broadcast, multicast, and unicast
storm control
storm control
Disabled. See the
Protected port
Disabled (Layer 2 interfaces only). See the
.
Port security
Disabled (Layer 2 interfaces only). See the
.
Port Fast
Disabled. See the
.