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Interface configuration

This chapter includes these sections:

• Ethernet interface overview

• General configuration

• Configuring a Layer 2 Ethernet interface or subinterface

• Configuring a Layer 3 Ethernet interface or subinterface

• Displaying and maintaining an Ethernet interface or subinterface

Ethernet interface overview

An interface is the point of interaction or communication between devices. It is used for exchanging data

between devices. A physical interface is an interface that materially exists and is supported by a device.

For example, an Ethernet interface is a physical interface. A logical interface is an interface that can

implement data switching but does not exist physically. A logical interface must be established through

configuration.

The device supports the following interfaces:

• Layer 2 Ethernet interfaces: They are physical interfaces operating on the data link layer for Layer

2 packet forwarding. They can only forward packets carrying source and destination IP addresses

that belong to the same network segment.

• Layer 3 Ethernet interfaces: They are physical interfaces operating on the network layer for Layer 3

packet forwarding, and forward packets carrying source and destination IP addresses that belong

to different network segments. You can assign an IP address to a Layer 3 Ethernet interface.

• Layer 2-Layer 3 Ethernet interfaces: They are physical interfaces that can operate on both the data

link layer and the network layer. When operating on the data link layer, a Layer 2-Layer 3 Ethernet

interface acts as a Layer 2 Ethernet interface. When operating on the network layer, a Layer 2-Layer

3 Ethernet interface acts as a Layer 3 Ethernet interface.

• Layer 2 Ethernet subinterfaces: They are logical interfaces operating on the data link layer. They are

mainly used for inter-VLAN packet forwarding on cards. By configuring Layer 2 Ethernet

subinterfaces for VLANs, you enable Layer 2 Ethernet packets to be forwarded across VLANs

through the corresponding Layer 2 Ethernet subinterfaces. The link type of a Layer 2 Ethernet

subinterface is access, which cannot be changed. Besides the Layer 2 subinterface configurations

described in this chapter, you can also assign a Layer 2 subinterface to a VLAN. For more

information, see the chapter ”VLAN configuration.”

• Layer 3 Ethernet subinterfaces: They are logical interfaces operating on the network layer. You can

assign an IP address to a Layer 3 Ethernet subinterface. By creating subinterfaces on a Layer 3

Ethernet interface, you can enable the interface to carry packets for multiple VLANs, which provides

great networking flexibility.

• Loopback interfaces: A software-only virtual interface. Once a loopback interface is created, its

physical status is always up and link layer protocols are enabled unless you manually shut down the

interface. You can enable routing protocols on a loopback interface, and enable it to receive and

transmit routing protocol packets. When you assign an IPv4 address for a loopback interface, the

subnet mask must be 32-bit long.

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H3c-technologies H3C SecBlade NetStream Cards Manual de usuario Pagina 70