LDP (Label Distribution Protocol) is the simplest way for Label Distribution. RSVP-TE (Resource Reservation Protocol-Traffic Engineering).You can find all Label Distribution Protocols below: The widely used standard one is LDP (Label Distribution Protocol). In other words, there are four Label Distribution Protocols. There are four main protocols for Label Distribution. Lastly, it exists from the Service Provider network with Egress Edge LSR. Then it travels in the Service Provider network through various LSRs (Provider Routers). The packet comes to Ingress Edge LSR firstly from the customer. Specifically, Edge LSRs can be divided into two as Ingress Edge LSR and Egress Edge LSR. Instead of Provider Router or Provider Edge Router, we can also use LSR (Label Switching Router) and Edge LSR (Edge Label Switching Router) terms for the routers capable of label switching. The below shape clearly explains the location of these routers. They are the borders between customer and Service Provider networks. They are the routers that VPN Services are defined. Provider Edge Router is the router that is located at the edges of the Service Provider Networks. Provider Router is the router used in Service Provider Networks for MPLS Label Switching and Data Forwarding. These routers are given below:Ĭustomer Router is the router of customer, so it is not related to MPLS network.Ĭustomer Edge Router is the router that is connected to MPLS PE Router of the Service Provider Network. There are different routers used in MPL Technology.
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These labels are router specific and local significant to that router.įirstly, I want to talk about Router terms used in this technology.
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This new protocol is using Labels for routing decisions. But changing all the existing routing protocols was very difficult, so IETF has chosen developing a new protocol. This development could be done with existing routing protocols. To solve all these problems IETF developed MPLS in 1997.
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In addition to these negative facts, there were some other problems about ATM technology, while working together with Ethernet and Frame Relay. If you would like to learn more about MPLS, you can follow the lessons of Nokia MPLS Training. In brief, MPLS Networking is combining the beneficial parts of both Layer 2 and Layer 3 of OSI reference model. Beside that it brings the speed of OSI layer 2 switching. Here Multi Protocol Label Switching brings also CEF and this bypass the slow part of this layer 3 decisions. The existing routing protocols are looking to the routing table for forwarding decision on all nodes and this was overloading the routers beside causing a lot of time lose. Over time, users in networks have increased and this big traffic has brought high bandwidth and forwarding speed need. It is the abbreviation of Multi Protocol Label Switching. In this lesson, we will focus MPLS in Networking and we will learn the answer of what is MPLS? So, What is MPLS? MPLS is a Packet-Forwarding technology which uses MPLS Labels for data forwarding decisions.