Contents

Configuring Reth interfaces· 1

About Reth interfaces· 1

Operating mechanism·· 1

Restrictions and guidelines: Reth interface configuration· 1

Configuring a Reth interface· 1

Restoring default settings for a Reth interface· 2

Displaying and maintaining Reth interfaces· 2

Configuring Reth interfaces

About Reth interfaces

A redundant Ethernet (Reth) interface is a virtual Layer 3 interface that uses two member interfaces to ensure link availability. One member interface is active and the other is inactive. When the active interface fails, the inactive interface becomes active. The member interface switchover does not interrupt traffic.

Operating mechanism

A member interface of a Reth interface can be in either of the following states:

·     Active—The interface can forward packets. A Reth interface can have only one active member interface.

·     Inactive—The interface cannot forward packets.

A Reth interface determines the state of its member interfaces by using the following rules:

·     When the member interfaces are physically up, the member interface with the higher priority is active. The other member interface is inactive. The priority of an interface is user configurable.

·     When the member interfaces are physically down, both interfaces are inactive.

·     When the active member interface goes down physically, the inactive interface automatically becomes active to forward packets.

The switchover between the Reth member interfaces is not visible to the network and does not cause network topology changes. For the upstream and downstream devices, they are connected to the Reth interface and learn only the MAC address of the Reth interface.

Restrictions and guidelines: Reth interface configuration

An MPU has a minimum of two management Ethernet interfaces.

After you assign a management Ethernet interface to a Reth interface, the IP address of the management Ethernet interface no longer takes effect. You can log in only through the IP address of the Reth interface.

Configuring a Reth interface

1.     Enter system view.

system-view

2.     Create a Reth interface and enter its view.

interface reth interface-number

By default, no Reth interfaces exist.

3.     Assign a member interface to the Reth interface.

member interface interface-type interface-number priority priority

By default, a Reth interface does not have member interfaces.

4.     (Optional.) Configure the expected bandwidth for the Reth interface.

bandwidth bandwidth-value

By default, the expected bandwidth is 10000 kbps.

The expected bandwidth is an informational parameter used only by higher-layer protocols for calculation. You cannot adjust the actual bandwidth of an interface by using this command.

5.     (Optional.) Configure the description of the Reth interface.

description text

The default description of a Reth interface is interface-name Interface (for example, Reth1 Interface).

6.     (Optional.) Set the MTU of the Reth interface.

mtu size

By default, the MTU of a Reth interface is 1500 bytes.

7.     Bring up the Reth interface.

undo shutdown

The default of this command varies by device model.

Restoring default settings for a Reth interface

Restrictions and guidelines

This command might fail to restore the default settings for some commands for reasons such as command dependencies and system restrictions.

To resolve this issue:

1.     Use the display this command in interface view to identify these commands.

2.     Use their undo forms or follow the command reference to restore their default settings.

3.     If the restoration attempt still fails, follow the error message instructions to resolve the issue.

Procedure

1.     Enter system view.

system-view

2.     Enter a Reth interface view.

interface reth interface-number

3.     Restore the default settings for the Reth interface.

default

Displaying and maintaining Reth interfaces

Execute display commands in any view and reset commands in user view.