Point-to-Point Protocol Part 2

Multi-Link PPP

It is another cool feature of PPP, which offers to combine multiple links and create an stronger link that could support more bandwidth, load balancing, and mitigation of single point of failure. This functionality is similar to Ether-channel.

In multilink-interface we need to assign it IP and we take out IPs from serial interfaces, then we make a virtual interface and assign interfaces to that virtual link. This task is performed while you have at least two interfaces and you want to merge them.



Notice that we do not have any multilink-interface and there are IPs on serial interfaces we have to take off the IPs, shut down the interfaces to configure the multi-link feature.

Now we need to create the multi-link interface.


Now we need to assign the serial interfaces to this multi-link interface.


Now we need to do the same stuff for R5.



Now if we see the running configuration our serial interfaces show that they are part of multilink interface.


The multilink interface is in down status because our serial interfaces are down. The multilink interface only comes up when at least a single physical interface is up and running.


Now when we turn on one physical interface our multilink interface also comes up and it shows the information such as up interfaces, bandwidth, up time, and more.


Now when we turn on both interfaces look how bandwidth gets changed.


Now the nicest thing happens when we see the routing table and the multilink interface is in the routing table and serials are no more in game.



Point-to-Point over Ethernet is a technology that is used for the authentication. This technology is mostly used in DSL environment.

In Cisco routers we need to know this technology for client side. Where we need to create a dialer interface and username and password that would be provided to the server to get authenticated.


We made the dialer interface assigned a number to it. We also changed the size of MTU, by default it is 1500 bytes but now we are adding PPPoE as well in our packet so we have to make room for this as well and by changing the size of MTU we did this.

The above configuration is all you need to do if you are not really using the authentication, but if you are interested with authentication as well then you have to execute the following commands additionally.


The username and password is provided by the server.

There is one more thing that we need to configure as well and that is NAT, so by combining all this together we need to run the following all commands to get the PPPoE configured.


ip address negotiated commands says that the IP will be given by the server upon successful authentication.

Notice that PPPoE is only used in a dial-up network, where you have a phone line and you dial for network access.

Prerequisites for 200-301

200-301 is a single exam, consisting of about 120 questions. It covers a wide range of topics, such as routing and switching, security, wireless networking, and even some programming concepts. As with other Cisco certifications, you can take it at any of the Pearson VUE certification centers.

The recommended training program that can be taken at a Cisco academy is called Implementing and Administering Cisco Solutions (CCNA). The successful completion of a training course will get you a training badge.

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