R2511-HP MSR Router Series Interface Configuration Guide(V5)

Configuring Ethernet interfaces

All configuration tasks in this chapter are independent and optional. You can perform these

configuration tasks in any order.

Overview

Ethernet is the most widespread wired LAN technology due to its flexibility, simplicity, and easy

implementation. Your device supports the following types of Ethernet interfaces:

• Layer 2 Ethernet interfaces—Physical Ethernet interfaces operating at the data link layer (Layer 2)

to forward traffic within a subnet between hosts.

• Layer 3 Ethernet interfaces—Physical Ethernet interfaces operating at the network layer (Layer 3) to

forward traffic between different subnets. You can assign an IP address to a Layer 3 Ethernet

interface.

• Layer-configurable Ethernet interfaces—Physical Ethernet interfaces that can be configured to

operate in bridge mode as Layer 2 Ethernet interfaces or in route-mode as Layer 3 Ethernet

interfaces.

• Layer 3 Ethernet subinterfaces—Logical interfaces operating at 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 enable the interface to carry packets for multiple VLANs. For how a Layer 3 Ethernet

subinterface sends and receives VLAN-tagged packets, see Layer 2—LAN Switching Configuration

Guide.

Performing general configurations

This section describes the settings common to Layer 2 and Layer 3 Ethernet interfaces, and Layer 3

Ethernet subinterfaces. For more information about the settings specific to a type of Ethernet interfaces,

see "Configuring a Layer 2 Ethernet interface" and

"Configuring a Layer 3 Ethernet interface or

subinterface."

Configuring a combo interface

The following matrix shows the feature and router compatibility:

Feature MSR900 MSR93X MSR20-1X MSR20 MSR30 MSR50 MSR1000

Configuring a

combo interface

No No No No

Available

only on

MSR30-40

and

MSR30-60

routers

Yes Yes

A combo interface is a logical interface that comprises one fiber port and one copper port. The two ports

share one forwarding channel and one interface view, so they cannot work simultaneously. When you

enable one port, the other port is automatically disabled.