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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.


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.


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 LinksConfiguring MLPPP and LFI on Serial Links



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 Junos OS 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.


    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.


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.


Confirm that the configuration is working properly:

Verifying the MLPPP Bundle


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


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