PPP Multilink Tutorial

In this tutorial, we are going to set up a simple WAN network. The scenario will illustrate how to connect and bundle (inverse mux) multiple T1s from one site to another using PPP multilink, so that it is treated as one “bundled” connection. In effect, this allows for redundancy, load balancing, and simplifies routing by only using one connector network. The following is a diagram illustrating how we are use this service over the WAN.

After we have connected the T1 circuits to serial 0/0 and 0/1, we will proceed to bundle the T1s into one logical connection. We are only doing this on two serial interfaces, however more can be bundled together as bandwidth requirements change over time.

WAN IP address: make sure it is only set on the multilink interface. Also, a “no shut” command may be needed to enable both the physical serial & logical multilink interfaces.

To avoid any packet loss, make sure you shut down any problematic serial interfaces / circuits. If you need them up for troubleshooting purposes, it is advised to take them out of the multilink group, so it does not adversely effect WAN performance.

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