MPLS Background and Overview

History. PAGEREF _Toc173309857 \h 1

Concept. PAGEREF _Toc173309858 \h 2

MPLS Frame.. PAGEREF _Toc173309859 \h 3

FEC.. PAGEREF _Toc173309860 \h 4

Routing.. PAGEREF _Toc173309861 \h 4

Label Path Control PAGEREF _Toc173309862 \h 4

Traffic Control Mechanisms. PAGEREF _Toc173309863 \h 4

Data Link Layer. PAGEREF _Toc173309864 \h 5

Label Distribution Mechanisms. PAGEREF _Toc173309865 \h 5

QoS in MPLS.. PAGEREF _Toc173309866 \h 7

Positive Features of MPLS.. PAGEREF _Toc173309867 \h 8

Efficient Packet Forwarding.. PAGEREF _Toc173309868 \h 8

Qos. PAGEREF _Toc173309869 \h 8

Traffic Engineering.. PAGEREF _Toc173309870 \h 8

Virtual Private Networks. PAGEREF _Toc173309871 \h 9

Shortcomings of MPLS.. PAGEREF _Toc173309872 \h 10

Flexibility. PAGEREF _Toc173309873 \h 10

Overhead.. PAGEREF _Toc173309874 \h 10

Multicast. PAGEREF _Toc173309875 \h 11

QoS.. PAGEREF _Toc173309876 \h 11

Data Link Layer. PAGEREF _Toc173309877 \h 11