Table of Contents
What is MLPPP?
MLPPP (Multilink Point-to-Point Protocol) is the protocol that bundles multiple serial wan links into a one Logical Bundle. As a name, PPP Multilink, MLP and MP are also used for MLPPP (Multilink Point-to-Point Protocol). Here, we will learn the theorical parts, to learn How to Configure MLPPP on Cisco devices, you can also view MLPPP Configuration lesson.
There can be multiple PPP serial links between two nodes. With MLPPP, these links are bundled and become a single logical link.
PPP Multilink Load Balancing
In PPP Multilink, Load Balancing is used between the member links of the Logical Link. The traffic is shared between ea linkh of these links. Load Balancing is used with fragmentation in MLPPP.
PPP Multilink Fault Tolerance
MLPPP provide Fault Tolerance with multiple links to the same destination. If one of the links between the nodes fails, the link stays up and the communication continues. With this mechanism, MLPPP also provide redundacy between links.
Easiness in Layer 3
The Layer 3 configuration, IP configurations and Routing Protocol configurations are done on the Logical interface of PPP Multilink. So, MLPPP provides also a Layer 3 configuration easiness.
MLPPP Fragmentation
In MLPPP (PPP Multilink) , packet fragmentation is also supported beside load balancing. With packet fragmentation, the packets that are fragmented are sent at the same time in different members of the Logical Bundle.
Here, if the coming packet has MLPPP Header, it is fragmentad and sequenced and at the other end it is reassembled. If it is not, the packet is not sequenced and send only as first come first sent.
MLPPP in TCP/IP Model
In TCP/IP Model, PPP Multilink works in the Network Interface Layer like PPP. But it is above the PPP in the hierarchy.
Gokhan Kosem is a Network Engineer, Instructor and the Founder of IPCisco.com with 15+ years of experience in Cisco, Nokia, Huawei, Juniper, Linux, Service Provider Networks, Routing and Switching technologies.
He has worked on the backbone networks of major service providers and network vendors including Nortel, Alcatel-Lucent (Nokia) and has extensive hands-on experience with Cisco, Huawei, Juniper and Nokia networking technologies.
He has trained thousands of networking students worldwide through IPCisco.com, Udemy, books, labs, quizzes, and educational content across multiple social media platforms.
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