MPLS Terms for Cisco CCNA Exams

David Bombal
A free video tutorial from David Bombal
CCIE #11023, over 15 years of network training experience
4.6 instructor rating • 43 courses • 692,227 students

Lecture description

This is one of multiple MPLS videos that are part of my CCNA course. 

Learn more from the full course

CCNA MPLS Core technologies and MPLS Layer 3 VPNs: Exam prep

Prepare for CCNA, ICND2, CCNP or CCIE exams by learning about MPLS, VRFs, MBGP, Labels, redistribution, VPNV4, PHP +more

01:28:45 of on-demand video • Updated

  • Learn about the advantages of MPLS and MPLS L3VPNs
  • Learn what MPLS labels are
  • Learn how core MPLS works
  • Learn how to configure MPLS L3VPNs
  • Learn how to hide core MPLS routers from customers
  • View MPLS labels using Wireshark
  • Learn MPLS terms: CE, PE, P, Labels, PHP and more
  • Learn how to configure MBGP
  • Learn how to configure VRFs
  • Learn how to redistribute between MBGP and OSPF
English [Auto] This video we're going to discuss and PLX multi protocol label switching the term multi protocol means that emplace supports multiple Hialeah protocols such as IP version 4 IP version 6 and even other protocols such as Layer 2. So you can encapsulate layer 2 over an emplace network label switching means that emplace uses labels. So we have multi protocol labels switching where multiple protocols are switched from one interface to another on a router using labels. Now emplace like a lot of technologies uses its own definitions and terms in this typology we have a core emplace network and to customers the blue customer and the green customer in an imperialist network a Pirata or provide a router is not connected to any customer routers Zappy one P2 and P3 have all the interfaces in the provider network. So they are provider routers P1 and P2 are known as providing edge routers they have interfaces connected to the provider network but they also have interfaces connected to customer networks so they are on the edge of the emplace network and hence are called provider routers these rodders are called Customer edge routers. In other words they connect the customer network to the network in a customer's site. They may be many routers but the edge router in the customer network is called a C or customer edge router because it's connecting the customer network to the network. So these are called Seat rods or customer edge routers. These are called Pete erodes or provider edge routers and these three Raud is in a call called provider routers. Labels are used only in the core network. No labels are used on these links to the customer networks so labels would be used here here here and here. This router is called an ingress label switch router or edge LSR Pete to one and P3 are called intermediate al-Assads or intermediate the label switch routers P2 would be called and a grace Elazar. The reason is as follows when traffic is sent from C-1 to C-3 traffic is sent here as an IP packet. So IP across a layer too. So as an example it would be IP version 4 across Ethernet Misrata. Pete E-1 the ingress LSR or ingress label switch Rodda imposes or inserts a label and the traffic is forwarded to P2 as a labelled packet. I'll show you why shock capture of the label but essentially between layer 2 and 3 we have what's called a shim header or an additional header. Between Ethernet an IP version 4. So an additional layer is added often called Layer two and a half Ethernet a layer to IP at least three emplace at least two and a half. When it gets to to the intermediate label switch router it swaps the label. So if one could have added a label of 20 and sent it to P2 P2 would swap the label to for example 21. The numbers aren't sequential but let's say 20 is swapped to 21 when it gets to 1. It would swap the label for 22 and send it out here. P3 would swap the label for 23 but it doesn't have to be special. It could be another number such as 40 when the traffic gets to Pete E-2 it strips or removes or pops the label and then it's forwarded here as IP traffic without a label. So Pete you won the ingress labels which Rodda imposes or pushes or inserts a label choose the term that you like. Is it a router. Is it a router. Is it a push. Is it an insert. Is it impose. It essentially adds the label P to P1 and P3 swap the label and P2 pops the label or removes the label and then forwards the traffic as IP traffic to C-3 know your terminology traffic sent from CTE one to C-3 to a specific destination uses what's called a label switch path or LSP which traverses the imperialis network labels which path is unidirectional. So a different label search path would be used for traffic sent back. It may use the same physical interfaces but it's a separate LSP or label switch POS. I hope you enjoyed this video if you did please like it please subscribe to my YouTube channel. I wish you all the very best.