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Examples: Bundling Multiple PPP Links on a Single Link Using MLPPP

 

Example: Configuring an MLPPP Bundle

This example shows how to configure an MLPPP bundle to increase traffic bandwidth.

Requirements

Before you begin, you should have two MX Series routers (MX240, MX480, or MX960 routers) configured with at least two serial interfaces that communicate over serial links.

Overview

In this example, you create the MLPPP bundle lsq-0/0/0.0 at the logical unit level of the link services interface lsq-0/0/0 on the MX Series routers R0 and R1. You then add the two serial interfaces se-1/0/0 and se-1/0/1 as constituent links to the multilink bundle. In Figure 1, your company's branch office is connected to its main branch using routers R0 and R1. You transmit data and voice traffic on two low-speed 1-Mbps serial links. To increase bandwidth, you configure MLPPP and join the two serial links se-1/0/0 and se-1/0/1 into the multilink bundle lsq-0/0/0.0. Then you configure LFI and CoS on R0 and R1 to enable them to transmit voice packets ahead of data packets.

Figure 1: Configuring MLPPP and LFI on Serial Links
Configuring MLPPP and
LFI on Serial Links

Configuration

CLI Quick Configuration

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

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 in the CLI User Guide.

To configure MLPPP bundle:

  1. Create an interface on both the routers.
  2. Configure a family inet and define the IP address on device R0.
  3. Configure a family inet and define the IP address on device R1.
  4. Specify the names of the constituent links to be added to the multilink bundle on both the routers.
  5. Set the serial options to the same values for both interfaces on R0.Note

    R0 is set as a DCE device. The serial options are not set for interfaces on R1. You can set the serial options according to your network setup.

Results

From configuration mode, confirm your configuration by entering the show interfaces lsq-0/0/0, show interfaces se-1/0/0, and show interfaces se-1/0/1 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 router, enter commit from configuration mode.

Verification

Confirm that the configuration is working properly:

Verifying the MLPPP Bundle

Purpose

Verify that the constituent links are added to the bundle correctly.

Action

From operational mode, enter the show interfaces lsq-0/0/0 statistics command.

Inline Multilink PPP (MLPPP), Multlink Frame Relay (FRF.16), and Multilink Frame Relay End-to-End (FRF.15) for time-division multiplexing (TDM) WAN interfaces provide bundling services through the Packet Forwarding Engine without requiring a PIC or Dense Port Concentrator (DPC).

This example shows how to configure a Multilink PPP (MLPPP) bundle and Multilink Frame Relay End-to-End (FRF.15) for additional bandwidth, load balancing, and redundancy by aggregating low-speed links such as T1 (WAN interfaces).

Requirements

This example uses the following hardware and software components:

  • Two MX Series Routers

  • Junos OS Release 14.1 or later release

Before you begin, configure two MX Series routers (the MX240, MX480, or MX960) with at least two WAN interfaces that communicate over T1 links.

Overview

Traditionally, bundling services are used to bundle multiple low-speed links to create a higher bandwidth pipe. This combined bandwidth is available to traffic from all links and supports link fragmentation and interleaving (LFI) on the bundle, reducing high-priority packet transmission delay.

This support includes multiple links on the same bundle as well as multiclass extension for MLPPP. Through this service you can enable bundling services without additional DPC slots to support Service DPC and free up the slots for other MICs.

Configuring inline MLPPP for WAN interfaces benefits the following services:

  • CE-PE link for Layer 3 VPN and DIA service with public switched telephone networks (PSTN)-based access networks

  • PE-P link when PSTN is used for MPLS networks

In this example, to increase bandwidth, you configure MLPPP and join the T1 links into the multilink bundle. You aggregate T1 links to create the MLFR FRF.15 bundle on two MX Series routers, R0 and R1, and set the interface to lsq-. You configure logical units on the lsq- interface and set the family type to inet and an IP address. 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 and set the encapsulation type to frame-relay. You then define Router R0 as a DCE device and Router R1 as a DTE device. You set the DLCI value (range is from 16 through 1022). Finally, you set the multilink bundle to lsq-.

Topology

Figure 2: Configuring Inline MLPPP and Multilink Frame Relay End-End (FRF.15) for WAN Interfaces
Configuring Inline MLPPP
and Multilink Frame Relay End-End (FRF.15) for WAN Interfaces

Configuration

CLI Quick Configuration

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

Device R0

Device R1

To Configure Router R0

Step-by-Step Procedure

The following example requires you to navigate various levels in the configuration hierarchy. For information about navigating the CLI, see Using the CLI Editor in Configuration Mode in the CLI User Guide.

To configure inline MLPPP and Multilink Frame Relay End-to-End (FRF.15) for WAN Interfaces:

  1. Enable inline Layer 2 bundling services.
  2. Create the interface, specify a logical unit on the multilink bundle, and set the family type.
  3. Specify the encapsulation type as MLPPP.
  4. Create the interface, specify another logical unit on the multilink bundle, and set the family type.
  5. Specify another unit and define the multilink bundle as an MLFR FRF.15 bundle.
  6. Specify the names of the constituent links to be added to the multilink bundle.
  7. Define the router as a DCE device.
  8. Specify the DLCI as well as the multilink bundle to which the interface is to be added.
  9. Specify the names of the constituent links to be added to the multilink bundle.

To Configure Router R1

Step-by-Step Procedure

To configure inline MLPPP and Multilink Frame Relay End-to-End (FRF.15) for WAN Interfaces:

  1. Enable inline Layer 2 bundling services.
  2. Create the interface, specify a logical unit on the multilink bundle and set the family type.
  3. Specify the encapsulation type as MLPPP.
  4. Create the interface, specify another logical unit on the multilink bundle and set the family type.
  5. Specify another unit and define the multilink bundle as an MLFR FRF.15 bundle.
  6. Specify the names of the constituent links to be added to the multilink bundle.
  7. Specify the DLCI as well as the multilink bundle to which the interface is to be added.
  8. Specify the names of the constituent links to be added to the multilink bundle.

Results

For Router R0, from configuration mode, confirm your configuration by entering the show chassis, show interfaces lsq-1/0/0, show interfaces t1-1/0/0:1, show interfaces t1-1/0/0:2, show interfaces t1-1/0/0:3, and show interfaces t1-1/0/0:4 commands.

For Router R1, from configuration mode, confirm your configuration by entering the show chassis, show interfaces lsq-2/0/0, show interfaces t1-2/0/0:1, show interfaces t1-2/0/0:2, show interfaces t1-2/0/0:3, and show interfaces t1-2/0/0:4 commands.

If the output does not display the intended configuration, repeat the instructions in this example to correct the configuration.

For Router R0:

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

For Router R1:

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

Verification

Verifying the MLPPP Bundle and the MLFR FRF.15 Configuration

Purpose

Verify that the constituent links are added to the bundle correctly.

Action

From operational mode, run the show interfaces lsq-1/0/0 extensive command.

Sample Output

From the operational mode, enter the show interfaces lsq-2/0/0 extensive command.

From operational mode, enter the show interfaces lsq-1/0/0 statistics command.

From operational mode, enter the show interfaces lsq-2/0/0 statistics command.