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Advanced Network Architectures

Yasaman Motakef (ymotakef@mehr.sharif.edu)

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Overview: IP Forwarding Architectures Switched Forwarding Classical IP Over ATM (CLIP) LAN Emulation (LANE) Next Hop Resolution Protocol (NHRP) Multi Protocol Over ATM (MPOA) Multi Protocol Label Switching (MPLS)

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IP Forwarding Architectures

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Switched Forwarding

Overlay Model CLIP (Classical IP Over ATM) MPOA (Multi Protocol Over ATM)

Peer Model MPLS (Multi Protocol Label Switching)

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Classical IP Over ATM (CLIP)

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Classical IP Over ATM Model

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LAN Emulation (LANE)

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Legacy LAN and LANE Protocol Stacks

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LANE Components

LEC (LAN Emulation Client) LES (LAN Emulation Server) BUS (Broadcast and Unknown Server) LECS (LAN Emulation Configuration

Server)

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LANE Configuration

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Next Hop Resolution Protocol (NHRP)

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NHRP Components

NHC (Next Hop Client)

NHS (Next Hop Server)

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NHRP and CLIP Compared

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While waiting for the NHRP resolution reply, S has three options:

1. Drop the data packet.

2. Retain the packet until the reply comes back.

3. Forward the packet along the routed path toward node D.

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Multi Protocol Over ATM (MPOA)

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MPOA Components

ED (Edge Devices)

MPC (MPOA Client)

MPS (MPOA Server)

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Example of Network Topology

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Request Process

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Reply Process

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Data Transfer Through Shortcut VCC

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Multi Protocol Label Switching (MPLS)

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Label Switching Provides: Low-cost hardware

implementation.

Scalability to very high speeds.

Flexibility in the management of traffic flows.

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MPLS Separates Control and Forwarding Components

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Fundamentals of Labels A label identifies a virtual circuit

between two neighboring LSRs.

The meaning of a label is significant only between the two neighboring LSRs.

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A sequence of LSRs that is to be followed by a packet is called a label-switched path (LSP).

A group of packets that are forwarded in the same manner are said to belong to the same forwarding equivalence class(FEC).

Fundamentals of Labels cntd.

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MPLS labels in ATM and PPP/LAN

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Label Assignment Process Control traffic:

Topology driven label assignment. Request driven label assignment.

Data traffic: Traffic-driven label assignment.

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Label Stack

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VC Merging

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Output streams for VC merging and non-VC merging

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Label Distribution Protocol (LDP) Downstream-on-demand mode

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Explicit Routing for Traffic Engineering

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MPLS Support for Virtual Networks MPLS allows service providers to

configure LSPs to create virtual networks that support particular classes of traffic flows.

MPLS can also be used to create Virtual Private Networks (VPNs).

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Thanks for notice.