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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
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Chapter 9 Configuring Interface Characteristics
Configuring Ethernet Interfaces
Default Ethernet Interface Configuration
Table 9-1 shows the Ethernet interface default configuration for NNIs, and Table 9-2 shows the Ethernet
interface default configuration for UNIs. 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 21,
“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 Ethernet Configuration for NNIs
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)
VLAN 1 (Layer 2 interfaces only).
VLAN trunking Switchport mode access (Layer 2 interfaces only).
Port enable state Enabled.
Port description None defined.
Speed Autonegotiate.
Duplex mode Autonegotiate.
IEEE 802.3x flow control Flow control is set to receive: off. It is always off for sent packets.
EtherChannel Disabled on all Ethernet ports. See Chapter 31, “Configuring
EtherChannels.”
Port blocking (unknown multicast
and unknown unicast traffic)
Disabled (not blocked) (only Layer 2 interfaces). See the
“Configuring Port Blocking” section on page 21-7.
Broadcast, multicast, and unicast
storm control
Disabled. See the “Default Storm Control Configuration” section
on page 21-3.
Port security Disabled (only Layer 2 interfaces). See the “Default Port Security
Configuration” section on page 21-10.
Port Fast Disabled. See the “Default Optional Spanning-Tree
Configuration” section on page 16-5.
Auto-MDIX Enabled.
Cisco Discovery Protocol (CDP) Enabled.
VMPS Not configured.