7/30/2019 ch_14x

1/25

Chapter 14Web-Based Management

7/30/2019 ch_14x

2/25

Web-Based Management

Display on Web browser Economical displays

Ubiquitous access

Reduction in network load for non-polled

configuration

Web Interface vs Web-base management

Web-based management

Desktop management interface Web-based enterprise management

Java management extensions

7/30/2019 ch_14x

3/25

7/30/2019 ch_14x

4/25

Web Interface

NMS

SNMP Manager

Managed ObjectsSNMP Agent

Web Server

Web Browser

NMS Console

Desktop PC

SNMP

HTTP

Protocol b/w agent

and manager is SNMP

Traversing over

UDP/IP

Browser can be on

any platform

SNMP NMS

implementation is

platform and OS

Specific

7/30/2019 ch_14x

5/25

Proxy Server

Proxy Server

Manager

Applications

Managed ObjectsSNMP / Other

Agent

Web Server

Web Browser

Desktop PC

SNMP/

Other

HTTP

NMS console is

removed

Economical advantage.

Proxy svr can be

implemented on any

platform and protocol

b/w proxy svr and

management agents can

be either SNMP orproprietary protocol.

7/30/2019 ch_14x

6/25

Embedded WBM

Manager

Applications

Managed ObjectsWeb Server

Web Browser

Workstation/PC

HTTP

7/30/2019 ch_14x

7/25

HP Embedded Agent

Manager

Applications

Managed Objects

http

Web Agent

Web Browser

Workstation/PC

http

SNMP

Non-Web Agent

7/30/2019 ch_14x

8/25

Desktop Management Interface

Service Layer (SL)

Management Interface (MI)

Component Interface (CI) MIF DataBase

MIF: Management Information Format

Desktop ResidentManagement Applications

Hardware/Software Components

API

7/30/2019 ch_14x

9/25

Desktop Management Interface

Industry standard generated byl - Desktop Management Task Force (DMTF)

Started in 1992 to manage PCs

Manages both hardware and software

Two standards

Management information format (MIF),

similar to MIB Program interface with two APIs

7/30/2019 ch_14x

10/25

DMI Service Layer

Synchronization and Flow Control

Management Interface

Component Interface

MIF Access

MIF Set

MIF Install MIFDataBase

Request/Confirms

Response/Confirms Events/Response

Indications

CommandProcessing

EventProcessing

MIF Processing

7/30/2019 ch_14x

11/25

DMI Functions

DMI Service Provider SP/MIF

Database

Management Interface Server

RPC Support

MI Interface

Client

Indication

Server

RPC Support

MI Interface

Client

Indication

ServerLocal BlockInterface

Application

Data Block Mgmt

Interface

RPC SUPPORT

Indication Client

Data Block Component

InterfaceProcedural Component Interface

Block CI

Component

(HW/SW)

Procedural CI

Hardware

Component

Procedural CI

Software

Component

Procedural CI

Firmware

Component

RPC to/from

Remote Systems

7/30/2019 ch_14x

12/25

DMI MIB

enterprises

(1)

dmtf

(412)

dmiMIB

(1)

dmtfStdMifs

(2)

dmtfDynOids

(3)

dmiConformance

(3)

dmiNotification

(2)

private{1 3 6 1.4}

dmiObjects

(1)

MIF specified using ASN.1 syntax

Can be managed by an SNMP manager

DMTF task expanded to specify WBEM -

Web-based enterprise management

DMTF- Distributed Management Task Force

7/30/2019 ch_14x

13/25

Web-Based Enterprise ManagementWeb Client

SNMP

Managed ObjectsDMI

Managed Objects

DMI ProviderSNMP Provider

CIM

Object Manager

(CIMOM)

CIM

Schema

Management

Applica tions

Web Browser

Desktop PC

HTTP HTTP

HTTP

SNMP RPC

CIM

Managed Objects

HTTP

SNMP Agent

DMI Agent

CIM Agent

7/30/2019 ch_14x

14/25

Web-Based Enterprise Management

WBEM based on Common Information Module,developed by Microsoft

CIM is information-modeling framework intended

to accommodate all protocols and frameworks

Object-oriented Five components:

Web client

CIM object manager (CIMOM)

CIM schema Management protocol

Managed objects with specific protocol

7/30/2019 ch_14x

15/25

Microsoft WMI

CIM Object Manager RepositoryMOF Language

COM/DCOM API

Object Providers

WMI

Objects

WMI

SNMP

Objects

SNMP

DMI

Objects

RPC

Win 32

Objects

Win 32

Other

Objects

COM/DCOM

IWbemServices

Management

Applications

Snap-inSnap-in

COM/DCOM

IWbemServices

it consists Management

infrastructure,

management

applications,and

providers of data from

managed object

7/30/2019 ch_14x

16/25

Microsoft WMI

Windows Management Instrumentation (WMI) isthe infrastructure for management data and

operations on Windows-based operating

systems.

support WBEM CIM(Common information model)

comprises management infrastructure,

applications, and agents

WMI can be used in all Windows-basedapplications, and is most useful in enterprise

applications and administrative scripts.

7/30/2019 ch_14x

17/25

Java Management Extension

Java Management Extensions (JMX) isa Java technology that supplies tools for

managing and monitoring applications,

system objects, devices (e. g. printers) andservice oriented networks. Those

resources are represented by objects

called MBeans

http://en.wikipedia.org/wiki/Java_platformhttp://en.wikipedia.org/wiki/Application_softwarehttp://en.wikipedia.org/wiki/Computer_printerhttp://en.wikipedia.org/wiki/Computer_printerhttp://en.wikipedia.org/wiki/Application_softwarehttp://en.wikipedia.org/wiki/Java_platform

7/30/2019 ch_14x

18/25

JDMK

- Java Dynamic Management Kits

Core Management Framework / MBean Server

MBean

MBean

MBean

C-Bean

Protocol

Adaptor

Protocol

Adaptor

Web Server

HTML Adaptor

Manager Web Browser Application

Managed

Object

Managed

Object

Managed

Object

Java

Virtual

Machine

7/30/2019 ch_14x

19/25

JDMK

Java dynamic management tool kit to build Java-based NMS

MBean is an intelligent agent; does not need

polling as in SNMP agent

JDMK library of core management servicesimplemented as MBeans

Java Dynamic Management agent comprises

MBeans: core management framework,

MBean server

Protocol adaptors: interfaces to applications

7/30/2019 ch_14x

20/25

MBean Flow Diagram

http://URLA/

http://URLB/

http://URLC/

Web Server

7/30/2019 ch_14x

21/25

7/30/2019 ch_14x

22/25

7/30/2019 ch_14x

23/25

JMX Architecture

MBean Server

Service

Protocol

Adaptor

Web Server

HTML Adaptor

Java Virtual Machine

Managed

Object

Connector

Instrumentation

Level

Agent Level

Web Browser

Proprietary

Management

Application

Proprietary

Management

Application

JMX Manager

MBean Server

Service

Java Virtual Machine

Connector

SNMP

Manager

API

CIM/WBEM

API

TMN

ManagerAPI

Additional

Manager

APIs

Manager

Level

Managed

ObjectManaged

Object

7/30/2019 ch_14x

24/25

3 level archiecture

The Probelevel contains the probes(called MBeans) instrumenting the resources. Also called

the Instrumentationlevel.

The Agentlevel, or MBeanServer, is the core of JMX. It is

an intermediary between the MBean and theapplications.

The Remote Managementlevel enables remote

applications to access the MBeanServer through

Connectors and Adaptors.

http://en.wikipedia.org/wiki/Java_Management_Extensionshttp://en.wikipedia.org/wiki/Instrumentation_(computer_programming)http://en.wikipedia.org/wiki/Instrumentation_(computer_programming)http://en.wikipedia.org/wiki/Java_Management_Extensions

7/30/2019 ch_14x

25/25

Looking Ahead

Future network and system management frameworksshould accommodate well-established SNMP entities

Web agents are intelligent and future points to the use of

Web technology

Web-based management offers two options

WBEM is comprehensive and centralized approach to

enterprise management; accommodates both scalar and

object-oriented schemes

JMX is decentralized and uses Java technology; agents

embedded in objects and can be downloaded from NMS;platform independent

Future NMS environment could be a merger of the old and

the new - at least in the near future