The Green Abstraction Layer

A Standard Power-Management Interface for Next-Generation Network Devices

By group 8

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Agenda

Introduction

Motivation

GAL

Power management primitives

Process

Architecture

Summary

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Introduction

GAL- Interface between high level algorithms and lower level representing hardware

Energy management in network using physical resources

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Motivation

Increase power consumption and energy costs over time

Increased user traffic and router capacities

Network operates at maximum capacity

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GAL aims

Network control plane to access devices green networking capabilities.

Represent the power-management capabilities available in heterogeneous data plane hardware;

A framework for information exchange between power-managed data plane entities and control processes

A reference control chain enabling a consistent, hierarchical organization of multiple local and network-wide energy-management protocols.

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Management concepts PMP let operators modulate energy consumption of

network devices and subsystems

Invoke PMPs to provide QoS with minimum power

Giving each network device its own independent control algorithm which implement a network control policy(NCP)

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Types of Power Management

Primitives(PMPs)

Standby : freeze most functionalities =>low energy states, fast wake-up times

Power scaling : dynamically change the working rate of the component

Energy-Aware States (EAS) Power setting that can be configured through the GAL

Provides trade off between power consumption and n?W performance

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Control Policies

Network control policy (NCP): recent suggestion Three aspects of reducing consumption:a) by moving traffic flows among alternative networ

k paths, some nodes+subsystems(e.g. OSPF-TE)b) NCPs > LCPs, but has two drawbacks(higher feedb

ack/convergence delays+unwareness of mapping entities)=>overcome them

c) capture hardware nuances

=>motivate a strategy of jointly adopting LCPs+NCPs to optimize energy consunmption in a hierarchical way

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Purpose

To hide implementation details of energy-saving approaches

To provide standard interfaces for interactions between green hardware and its control framework

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Feature Hierarchical view of device’s organizations

Components at various levels as a tree

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Function

Provide energy-aware capabilities

Entities can trade off power consumption and performance

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Process

The lowest level PMPs require specific LCPs to directly

manage

GAL’s top level instance used here for interfacing such energy-aware entities

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Process (Contd.)

The intermediate level New LCPs are needed to orchestrate

entities’ settings

Expose a synthetic set and available configurations to higher levels

Terminates at the device level

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Process (Contd.)

The highest level Highest LCPs orchestrates the device’s

high-level configuration

Expose a simplified view to NCPs

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Hierarchical tree

Root nodes: LCPs and control apps

Leaf nodes: hardware elements

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Why leaf nodes reside at different levels Some energy-aware entities need to be accessible

from higher levels

Some manufactures would rather not expose subcomponents’ internal organization and hardware architecture

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Specific presentations

1. Entity 1’s LCP selects the chassis containing the the physical port bound to the logical link

2. The chassis’s LCP(entity1.2) forwards the command to the corresponding line card (entity 1.2.2), and reduces the fans’ speed

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Specific presentations(contd.)

3. If no other links active, the layer-3 LCP sends the entire line card to sleep

4. Otherwise, the LCP puts the physical interface into standby mode and reduce the performance of all hardware components that process packets for that port

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GSI

Green standard interface

A lightweight interface for managing energy-aware hardware entities

Provide a set of functions and data types for GAL interface

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GSI (contd.)

Discovery : retrieves information about available EASs and other information about an entity

Provisioning : allows control processes to set an EAS to an entity

Monitoring : of the physical device’s relevant parameters

GSI can interface with any network protocol, e.g. SNMP

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Summary

GAL provide a simple standard interface for representing the energy-aware capabilities of network devices to higher-level protocols

Features multilayered abstract model

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Reference

R. Bolla, R. Bruschi, F. Davoli, L. D. Gregorio, P. Donadio, L. Fialho, A. Lombardo, D. Reforgiato, and T. Szemetby, "The Green Abstraction Layer: A Standard Power Management Interface for Next-Generation Network Devices," submitted to the IEEE Internet Computing Magazine, 2012.

D. Reforgiato, A. Lombardo, F. Davoli, L. Fialho, M. Collier, P. Donadio, R. Bolla, R. Bruschi, "Exporting Data-Plane Energy-Aware Capabilities from Network Devices toward the Control Plane: The Green Abstraction Layer “, IEEE, 2012

The ECONET Project: Green Abstraction Layer, http://www.econet-project.eu/Public/Description/3

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