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Informática UFRGS. Implementation and Bandwidth Consumption Evaluation of SNMP to Web Services Gateways. Ricardo Neisse Ricardo Vianna Lisandro Zambenedetti Granville Maria Janilce Bosquiroli Almeida Liane Margarida Rockenback Tarouco Federal University of Rio Grande do Sul, Brazil.

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implementation and bandwidth consumption evaluation of snmp to web services gateways

Informática

UFRGS

Implementation and Bandwidth Consumption Evaluation of SNMP to Web Services Gateways

Ricardo Neisse

Ricardo Vianna

Lisandro Zambenedetti Granville

Maria Janilce Bosquiroli Almeida

Liane Margarida Rockenback Tarouco

Federal University of Rio Grande do Sul, Brazil

outline
Outline
  • Introduction
  • Web Services based management architecture
  • Type of gateways
  • Bandwidth consumption analysis
  • Conclusions and future work

Ricardo Neisse

Institute of Informatics, Federal University of Rio Grande do Sul, Brazil

introduction
Introduction
  • SNMP x new management challenges
  • XML applied in network management
    • NETConf
    • SNMP to XML gateways
    • Web Services

Ricardo Neisse

Institute of Informatics, Federal University of Rio Grande do Sul, Brazil

web services based management architecture
Web Services BasedManagement Architecture

UDDI

Look up

WS based network

managemend system

Publish

(WSDL)

Network

administrator

Invoke

(SOAP)

SNMP to WS

gateway

WS based network

management system

SNMP

Ricardo Neisse

Institute of Informatics, Federal University of Rio Grande do Sul, Brazil

web services gateways
Web Services Gateways
  • Provide access to device information through Web Services
  • Two types:
    • Protocol-level
    • Object-level

Ricardo Neisse

Institute of Informatics, Federal University of Rio Grande do Sul, Brazil

protocol level gateways
Protocol Level Gateways
  • Map SNMP operations (Get, GetNext, Set) into Web Service calls
  • E.g.

function Get ($ip, $community, $oid)

function GetNext ($ip, $community, $oid)

function Set ($ip, $community, $oid, $newvalue)

Ricardo Neisse

Institute of Informatics, Federal University of Rio Grande do Sul, Brazil

object level gateways
Object Level Gateways
  • Map each MIB object to a WS operation
  • E.g.

function GetSysLocation ($ip, $community)

function SetSysLocation ($ip, $community, $newvalue)

function GetIfAdminStatus ($ip, $community, $index=-1)

function SetIfAdminStatus ($ip, $community, $index, $newvalue)

Ricardo Neisse

Institute of Informatics, Federal University of Rio Grande do Sul, Brazil

protocol x object level
Protocol level:

Similar to SNMP

Manager is forced to know the MIB structure

New MIBs are supported without modifications in the gateway

Dynamic creation is not required to protocol level gateways

Object level:

Operations and bindings are described in WSDL

Changes in the MIB reflect in the gateway

Gateway dynamic creation

Protocol x Object Level

Ricardo Neisse

Institute of Informatics, Federal University of Rio Grande do Sul, Brazil

system for gateway dynamic creation
System for Gateway Dynamic Creation
  • Implemented in PHP
  • Generates object level gateways and WSDL descriptions from SMI MIB definitions
  • Uses LIBSMI to parse SMI files and NuSOAP to support Web Services

Ricardo Neisse

Institute of Informatics, Federal University of Rio Grande do Sul, Brazil

gateway dynamic creation
Gateway Dynamic Creation

SNMP to Web Service Gateway:

require_once('nusoap.php');

$server = new soap_server();

...

$server->register('ifOutOctets');

function ifOutOctets($ip, $str_com, $index=-1){

if($ip=='' or $str_com=='') return new soap_fault(‘1','client',‘Invalid Parameters');

else {

$res = snmpwalk($ip, $str_com, '.1.3.6.1.2.1.2.2.1.16');

if($index>-1) return $res[$index];

else return $res; }

}

...

$server->service($HTTP_RAW_POST_DATA);

Web-based network management station

Web server

SMIDUMP

(LIBSMI)

Instrumentation

(PHP SAX parser)

New gateway

(PHP Script)

Ricardo Neisse

Institute of Informatics, Federal University of Rio Grande do Sul, Brazil

bandwidth consumption evaluation
Bandwidth Consumption Evaluation
  • SNMP versus WS protocol-level and object-level gateways
  • Web Service gateways over:
    • HTTP and HTTPS
    • With and without Compression (zlib)

Ricardo Neisse

Institute of Informatics, Federal University of Rio Grande do Sul, Brazil

test scenario
Test Scenario

Points of measurement

SNMP

SOAP

Web Service based network

management system

SNMP to WS

Gateway

Linux

(Apache)

Linux (NetSNMP)

Ricardo Neisse

Institute of Informatics, Federal University of Rio Grande do Sul, Brazil

snmp test agent
SNMP Test Agent
  • Configure the number of objects to return in wsTableRows
  • SNMP data:

oid.1 (integer 1)

oid.2 (integer 2)

...

oid.n (integer n)

Ricardo Neisse

Institute of Informatics, Federal University of Rio Grande do Sul, Brazil

results 1 getnext operation of protocol based gateway
Results (1): GetNext Operation of Protocol Based Gateway

Ricardo Neisse

Institute of Informatics, Federal University of Rio Grande do Sul, Brazil

results 2 getwscolumn operation of object based gateway
Results (2): GetWSColumn Operation of Object Based Gateway

Ricardo Neisse

Institute of Informatics, Federal University of Rio Grande do Sul, Brazil

results 3 getnext operation of protocol level gateway with compression
Results (3): GetNext Operation of Protocol-Level Gateway with Compression

Ricardo Neisse

Institute of Informatics, Federal University of Rio Grande do Sul, Brazil

results 4 getwscolumn operation of object based gateway with compression
Results (4): GetWSColumn Operation of Object Based Gateway with Compression

Ricardo Neisse

Institute of Informatics, Federal University of Rio Grande do Sul, Brazil

conclusions
Conclusions
  • SNMP to Web Services gateways implementation
  • Object-level gateways do not require previous knowledge about object definitions
  • Object-level gateways always perform better than protocol-level gateways and perform better than SNMP when return:

Ricardo Neisse

Institute of Informatics, Federal University of Rio Grande do Sul, Brazil

future work
Future Work
  • Analysis of performance and memory required by gateways
  • Web Services Management Architecture
    • Configuration (NetConf)
    • Delegation (Script MIB)

Ricardo Neisse

Institute of Informatics, Federal University of Rio Grande do Sul, Brazil

thank you
Thank you!
  • Q&A?
  • Contact information:

Ricardo Neisse

neisse@inf.ufrgs.br

Ricardo Neisse

Institute of Informatics, Federal University of Rio Grande do Sul, Brazil

web services background
Web Services Background

UDDI

Look up

Publish

SOAP

Web Service

Client

Invoke

WSDL described service

Ricardo Neisse

Institute of Informatics, Federal University of Rio Grande do Sul, Brazil

ad