IT Certification

This is the Cisco CCIP (Cisco Certified Internet Engineer) certification of MPLS (multiprotocol label switching) part of the certification skills certification courses in the second article. CCIP Exam 642-611 – Implementing Cisco MPLS Exam to test these skills courses.

You have to understand the entire concept of MPLS there are several structures. The structure of the definition of MPLS backbone network for IP Forwarding how to create labels and actual labels to provide forwarding of communications services. Key concepts are as follows: forward equivalence classes; MPLS Control Panel; MPLS forwarding panel; label distribution protocol.

MPLS routers forward IP is basically the same way packets to make packet forwarding label. MPLS router into the network to check the label on the packet, and then issued a consultation in order to verify that the packet forwarding interface tab, then the packet will be transmitted.

The completion of this process is the key to the router must be made to the establishment of such labels. Through the use of routing protocols such as OSPF and BGP dynamic routing protocol to exchange information between the router approach to the establishment of such a publication. Create a label forwarding table is a need to take many steps of the process. MPLS Control Panel is responsible for binding a label to the IP routing table of network routers, and the results of these binding MPLS forwarded to other routers. MPLS label forwarding control panel agreement between the routers in the MPLS label exchange. A MPLS router assigned a local label and do a broadcast to the neighbors to leave the label.

Use MPLS forwarding equivalence class (FEC) to specify the concept of a group of specific binding of the IP packet labels. IP packet is a loose group of conditions, which in fact refers to a routing or IP prefix. FEC can also be smaller, only as a network prefix, as it can with the IP TOS field with the other rules specify a specific IP prefix.

Therefore, the router from the IP routing table to find FEC, and a label assigned to it. Then, the router has been assigned to the FEC label notify other routers. The distribution of the label known as the FEC list of LIB (database list). LIB router based on the information transmitted to the decision-making. The actual label to be used for forwarding on the label forwarding information base (LFIB) in. This is the MPLS forwarding plane.

Now let us summarize. MPLS control panel to the IP routing table of the IP router / prefix distribution label. MPLS Forwarding Forwarding tab panel set up. This label will be issued to point out that these labels will be transmitted from a single interface, as well as the label distribution of the label information will be exchanged.

Router to complete the next step is to establish a network of label switching path. This is a virtual path, network traffic will be forwarded to the other side of one end.