MPLS Structure

MPLS Structure and Architecture

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MPLS STRUCTURE ANDARCHITECTURE

You will be able to understand the structure of the MPLS Structure

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MPLS Structure and Architecture

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• Routing Protocols are used to distribute L3 Routing Information • Forwarding decisions are based on two things (Packet Header & Local Routing table) • Routing table performed at every hop

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MPLS Structure and Architecture

It will receive a packet that is not yet labeled, it will insert a label in front of packet.

It will receive the labeled packet, remove and send the packet on the destination link.

CE Router

CE Router

Edge LSR (Ingress)

Intermidiate LSR

Edge LSR (Egress)

The incoming labeled packet,it will switch the packet and send packet to the correct path.

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MPLS Structure and Architecture

• A Forward mechanism in which the packets are forwarded according to labels

IP Packet

L1

IP Packet

• Designed to support Layer 3 or non layer 3 Protocols

• Decreases forwarding overhead on Core Routers

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MPLS Structure and Architecture

Ingress Edge LSR

Ingress LSRs receive a packet that is not yet labeled, insert a label (stack) in front of the packet, and send the packet on a data link.

Ingress Edge LSRs

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MPLS Structure and Architecture

Intermidiate LSR

It will receive an incoming labeled packet, switch the packet and send the packet on the correct data link.

Ingress Edge LSRs

BACK

MPLS Structure and Architecture

Egress Edge LSR

It will receive a labeled packet, proceed by removing the label, and send the packet on a data link.

Ingress Edge LSRs

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MPLS Structure and Architecture

Control Plane

Data Plane

IP Routing Protocol

IP Routing Table

Label Exchange Protocol

IP Forwading Table (FIB)

Label Forwarding Table (LFIB)

Control Plane

Performs L3 protocol exchanges using IP routing

Data Plane

It functions as a forwarding engine according to labels or destination IP