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Configuring Multilink Frame Relay

 

The topics below discuss the overview and configuration details of Multilink Frame Relay FRF.15 and overview and configuration details of Multilink Frame Relay FRF.16 for security devices.

The link services intelligent queuing interface lsq-0/0/0 supports Multilink Frame Relay end-to-end (MLFR FRF.15).

With MLFR FRF.15, multilink bundles are configured as logical units on the link services intelligent queuing interface, such as lsq-0/0/0.0. MLFR FRF.15 bundles combine multiple permanent virtual circuits (PVCs) into one aggregated virtual circuit (AVC). This process provides fragmentation over multiple PVCs on one end and reassembly of the AVC on the other end. You can configure LFI and CoS with MLFR in the same way that you configure them with MLPPP.

This example shows how to configure MLFR FRF.15 for additional bandwidth, load balancing, and redundancy by aggregating low-speed links such as T1, E1, and serial links.

Requirements

Before you begin, you should have two Juniper Networks devices configured with at least two serial interfaces that communicate over serial links.

Overview

In this example, you aggregate two T1 links to create the MLFR FRF.15 bundle on two Juniper Networks devices, R0 and R1, and set the interface to lsq-0/0/0. You configure a logical unit on the lsq-0/0/0 interface and set the family type to inet with address 10.0.0.4/24. Then you configure an IP address for the multilink bundle on the unit level of the interface.

You define the multilink bundle as an MLFR FRF.15 bundle by specifying the MLFR end-to-end encapsulation type. You specify the names of the constituent links to be added to the multilink bundle as t1-2/0/0 and t1-2/0/1 and set the encapsulation type to frame relay. You then define R0 as a DCE device and R1 as a DTE device. You set the DLCI value to 100 (range is 16 through 1022). Finally, you set the multilink bundle to lsq-0/0/0.0.

Configuration

CLI Quick Configuration

To quickly configure this example, copy the following command, paste it into a text file, remove any line breaks, change any details necessary to match your network configuration, copy and paste the command into the CLI at the [edit] hierarchy level, and then enter commit from configuration mode.

Step-by-Step Procedure

The following example requires you to navigate various levels in the configuration hierarchy. For instructions on how to do that, see Using the CLI Editor in Configuration Mode.

To configure the MLFR FRF.15 bundle:

  1. Create an interface on both devices.
  2. Set a logical unit on the interface and define the family type for devices R0 and R1.
  3. Define the multilink bundle as an MLFR FRF.15 bundle.
  4. Specify the names of the constituent links to be added to the multilink bundle.
  5. Define device R0 as a DCE device.
  6. Specify the DLCI as well as the multilink bundle to which the interface is to be added.

Results

From configuration mode, confirm your configuration by entering the show interfaces lsq-0/0/0, show interfaces t1-2/0/0, and show interfaces t1-2/0/1 commands for R0 and R1. If the output does not display the intended configuration, repeat the configuration instructions in this example to correct it.

If you are done configuring the device, enter commit from configuration mode.

Verification

Confirm that the configuration is working properly.

Verifying the MLFR FRF.15 Configuration

Purpose

Verify the MLFR FRF.15 configuration.

Action

From operational mode, enter the show interfaces command.

The link services intelligent queuing interface lsq-0/0/0 supports the Multilink Frame Relay (MLFR) user-to-network interface (UNI) and network-to-network interface (NNI) (MLFR FRF.16).

MLFR FRF.16 configures multilink bundles as channels on the link services intelligent queuing interface, such as lsq-0/0/0:0. A multilink bundle carries Frame Relay permanent virtual circuits (PVCs), identified by their data-link connection identifiers (DLCIs). Each DLCI is configured at the logical unit level of the link services intelligent queuing interface and is also referred as a logical interface. Packet fragmentation and reassembly occur on each virtual circuit. You can configure LFI and CoS with MLFR in the same way that you configure them with MLPPP.

This example shows how to configure MLFR FRF.16 for additional bandwidth, load balancing, and redundancy.

Requirements

Before you begin, you should have two Juniper Networks devices configured with at least two serial interfaces that communicate over serial links.

Overview

In this example, you aggregate two T1 interfaces to create an MLFR FRF.16 bundle on two Juniper Networks devices, R0 and R1. You configure the chassis interface and specify the number of MLFR FRF.16 bundles to be created on the interface. You then specify the channel to be configured as a multilink bundle and create interface lsq-0/0/0:0. You set the multilink bundle as an MLFR FRF.16 bundle by specifying the MLFR UNI NNI encapsulation type.

Then you define R0 as a DCE device and R1 as a DTE device. You configure a logical unit on the multilink bundle lsq-0/0/0:0, and set the family type to inet. You then assign a DLCI of 400 and an IP address of 10.0.0.10/24 to the multilink bundle. You create the T1 interfaces, t1-2/0/0 and t1-2/0/1, that are to be added as constituent links to the multilink bundle and define the Frame Relay encapsulation type. Finally, you set the multilink bundle to lsq-0/0/0:0.

Configuration

CLI Quick Configuration

To quickly configure this example, copy the following command, paste it into a text file, remove any line breaks, change any details necessary to match your network configuration, copy and paste the command into the CLI at the [edit] hierarchy level, and then enter commit from configuration mode.

Step-by-Step Procedure

The following example requires you to navigate various levels in the configuration hierarchy. For instructions on how to do that, see Using the CLI Editor in Configuration Mode.

To configure an MLFR FRF.16 bundle:

  1. Configure a chassis interface.
  2. Specify the number of MLFR bundles.
  3. Create an interface.
  4. Specify the MLFR encapsulation type.
  5. Set device R0 as a DCE device.
  6. Specify a logical unit on the multilink bundle and set the family type.
  7. Create the T1 interfaces and set the Frame Relay encapsulation.
  8. Specify the multilink bundle to which the interface is to be added as a constituent link on device R0.
  9. Specify the multilink bundle to which the interface is to be added as a constituent link on device R1.

Results

From configuration mode, confirm your configuration by entering the show commands for devices R0 and R1. If the output does not display the intended configuration, repeat the configuration instructions in this example to correct it.

For device R0

For device R1

If you are done configuring the device, enter commit from configuration mode.

Verification

Confirm that the configuration is working properly.

Verifying the MLFR FRF.16 Configuration

Purpose

Verify the MLFR FRF.16 configuration.

Action

From operational mode, enter the show interfaces command.