9-12
Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
OL-8915-03
Chapter 9 Configuring Interface Characteristics
Configuring Ethernet Interfaces
Configuring Ethernet Interfaces
These sections contain this configuration information:
• Default Ethernet Interface Configuration, page 9-12
• Setting the Type of a Dual-Purpose Uplink Port, page 9-13
• Configuring Interface Speed and Duplex Mode, page 9-15
• Configuring IEEE 802.3x Flow Control, page 9-17
• Configuring Auto-MDIX on an Interface, page 9-18
• Adding a Description for an Interface, page 9-19
Default Ethernet Interface Configuration
Table 9-1 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 Chapter 11,
“Configuring VLANs.” For details on controlling traffic to the port, see Chapter 23, “Configuring
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. 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 9-1 Default Layer 2 Ethernet Interface Configuration
Feature Default Setting
Operating mode Layer 2 or switching mode (switchport command).
Allowed VLAN range VLANs 1 to 4094.
Default VLAN (for access ports) VLAN 1 (Layer 2 interfaces only).
Native VLAN (for IEEE 802.1Q
trunks)
VLAN 1 (Layer 2 interfaces only).
VLAN trunking Switchport mode dynamic auto (supports DTP) (Layer 2 interfaces
only).
Port enable state All ports are enabled.
Port description None defined.
Speed Autonegotiate.
Duplex mode Autonegotiate.
Flow control Flow control is set to receive: off. It is always off for sent packets.
EtherChannel (PAgP) Disabled on all Ethernet ports. See Chapter 33, “Configuring
EtherChannels and Layer 2 Trunk Failover.”
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