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MPLS Configuration Gns3 LAB | MPLS Cloud Providers with VPN, BGP

MPLS is a significant part of the SPOTO CCIE RS 400 101 lab exam.  However, some candidates found that it's difficult to master MPLS, SPOTO candidates passed these parts of the CCIE RS Lab exam easily. More info can be found in the SPOTO Cisco WhatsApp study group.


MPLS configuration Gns3 lab

This article is about MPLS (Multiprotocol Label Switching, which is a telecom operator (ISP) commonly used in long-range connectivity solutions. Before technical discussions, first thing to note is that the configuration of the technology in enterprise environments or enterprise set in the MPLS cloud service provider (ISP) is completely different.


Why use MPLS

MPLS is a label-based packet-based fast switching based fast switching. The routing device switching process is generally used, wherein whenever a data packet is received, which checks its IP address and forwards ti after a match with the routing table, this process may involve "transmission MAC address of the ARP request." Imagine, when there is high traffic, like VOIP, like, this process becomes a little slow. For example, IP phone call packets may use 100 / S, and then each of the router 100 to be performed on the packet processors. Other Layer 2 technology (i.e., HDLC, ATM, and Frame Relay) and conventionally used for different remote, using the MPLS label base layer technology, also known as the routing label basis. The solution is to MPLS, wherein each data packet router assigned label for fast switching.


Here are our lab MPLS cloud, it is created in GNS3. You can see that we have one labeled "ISP MPLS backbone" network service provider, and there are two customer edge.

Before entering configuration, the reader must keep in mind a few basic concepts to understand the elements involved in the scenario role

Customer Edge (CE)

Customer Edge (CE) device is installed in the company of the remote unit, it will receive the connection provider solutions.


Provider Edge (PE)

Provider Edge (PE) is connected to one (or more) clients router carrier router, PE and P routers are connected. P (provider) represents the network infrastructure by operators of other routers MPLS cloud distribution.


Virtual Routing and Forwarding


Another key concept is technology VRF (Virtual Routing and Forwarding), it brings two other equally important elements: RD (Routing distinction) and RT (Route Target). By VRF, you can create multiple instances of a routing table, present in the router while working. This division is increased by allowing the network path without the use of a plurality of devices. Among all customers operators subnet is no separate VRF routing traffic up a single table, from a security point of view it would be bad. Another common benefit is that it enables customers to use the same network address.


However, at some point, the route between the router and the company (CE) and carrier router (PE) must be re-assigned to the BGP process the PE.


Here there is a problem: Obviously, VRF may have duplicate addresses, because they represent different routing tables. This can only be a unique so-called the RD (routing identifier) ​​identifying pain by adding a route.

more info can be found in the following article.


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