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Page 1: SELLING WORLDNET OSLO TO BROADCAST  · PDF fileSELLING WORLDNET OSLO TO BROADCAST ... ‐‐It is CERAGON's intent to encourage the widespread use of

SELLING WORLDNET SELLING WORLDNET OSLO TO BROADCAST OSLO TO BROADCAST PARTNERSPARTNERSPARTNERS PARTNERS 

....and having ten fingers left to tcount on

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DIGGING DEEPERDIGGING DEEPER

Understanding and Implementation f SNMP i B d t F ilit C t lof SNMP in Broadcast Facility Control

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SNMP IN BROADCAST FACILITY CONTROL ‐ OUTLINE

ToolsBooks, iReasoning MIB browser, Notepad ++, 

ASN‐1

R di th MIBReading the MIB

A WALK through the MIB ‐ selecting the OIDs

Initial GET and response understanding the dataInitial GET and response, understanding the data

SNMP Agent factors

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SNMP BOOKS AND REFERENCE MATERIAL 

Essential SNMPMauro and Schmidt, O’Reilly press

Understanding SNMP MIBsPerkins and McGinnis Prentice HallPerkins and McGinnis, Prentice Hall 

DPS telecomWhite papers, etc.

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SNMP TOOLS – MIB BROWSER 

MIB browser CAN  Provide an essential window into the SNMP world

Examine MIB files, browse to and read about all OIDs

Examine MIB structure, tables, traps, imports

WALK the MIB test OIDs individually and en masseWALK the MIB – test OIDs individually and en masse

GET data from any specific OID – see raw values 

MIB browser can (typically) NOTAutomatically poll Agent for data or issue SET commands (Manager can)

Notify technical personnel of parameters that exceed thresholds

Integrate data and readings from traditional I/O connectionsIntegrate data and readings from traditional I/O connections

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MIB BROWSER – IREASONING.COM

Download and install MIB Browser softwareMIB Browser software

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MIB BROWSER ORIENTATIONSelected OID

Agent IP addressFunction controls

MIB tree

Results table

D i i f l d OIDDescription of selected OID

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SNMP TOOLS – NOTEPAD++

“Advanced” notepad for analysing programs, MIB files, etc.http://notepad‐plus‐plus.org/p // p p p g/

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SNMP MIB FILE IN STANDARD NOTEPAD 

Some MIB files are not formatted for text editorsEx Toshiba MIB is formatted properlyEx. Toshiba MIB is formatted properly…

Divicom Europa MIB…. Not so much

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DIVICOM EUROPA MIB FILE IN NOTEPAD ++

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SNMP – UNDERSTANDING ASN‐1

: : =  “Is defined as”

Comment line‐ ‐ Comment line

/* */ Comment block

| Delimits alternatives| Delimits alternatives

: : =  {<well known name> <integer>} New branch or OID

OBJECT‐GROUP Group 2+ objects

OBJECT‐TYPE Define 1 objectSyntax, Units, Access, Status, Description

OID (typically formatted as :: { <known branch> <integer> }OID (typically formatted as ::= { <known branch> <integer> }

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ASN‐1 SYNTAX EXAMPLES

nvControllerResetAlarms OBJECT‐TYPESYNTAX INTEGER (0..1)MAX ACCESS read writeMAX‐ACCESS read‐writeSTATUS currentDESCRIPTION"Reset alarms (any value will cause reset ‐ use 1)"::= { nvController 7 }

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SNMP – READING THE MIB

MIB structureHeader

Imports

DefinitionsDefinitions

Objects

– Scalar

– columnar with index definitions

– Traps

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SNMP MIB HEADER 

Some MIB writers include a lot of descriptive elements in a header or comment section

Comments can be included anywhere in the MIB, preceded by ‐ ‐

Example: MIB from Divicom Europa ElectraExample: MIB from Divicom Europa Electra 

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SNMP MIB HEADER 

Some MIB writers include a lot of descriptive elements in a header or comment section

Comments can be included anywhere in the MIB, preceded by ‐ ‐

Example: MIB from Divicom Europa ElectraExample: MIB from Divicom Europa Electra

Other  manufacturers include revision lists and authorsExample Toshiba UPS

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SNMP MIB HEADER 

Some MIB writers include a lot of descriptive elements in a header or comment section

Comments can be included anywhere in the MIB, preceded by ‐ ‐

Example: MIB from Divicom Europa ElectraExample: MIB from Divicom Europa Electra

Other  manufacturers include revision lists and authorsExample Toshiba UPS

Others get right to the pointExample: Nautel

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SNMP ‐ IMPORTS

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SNMP DEFINITIONS 

Definitions can help shorten the OID for each object‐‐{ iso(1) org(3) dod(6) internet(1) private(4) enterprises(1) toshiba(186) ‐‐ equ(1) equups(19) ticups(2) sp1(1) }

toshiba OBJECT IDENTIFIER ::= { enterprises 186 }equ OBJECT IDENTIFIER ::= { toshiba 1 }equUPS OBJECT IDENTIFIER ::= { equ 19 }ticUPS OBJECT IDENTIFIER ::= { equUPS 2 }sp1         OBJECT IDENTIFIER ::= { ticUPS 1 }

upsIdent OBJECT IDENTIFIER ::= { sp1 1 }upsBattery OBJECT IDENTIFIER ::= { sp1 2 }upsInput OBJECT IDENTIFIER ::= { sp1 3 }

O OBJECT IDENTIFIER { 1 4 }upsOutput OBJECT IDENTIFIER ::= { sp1 4 }

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SNMP GROUP DEFINITIONS 

Numbering may not always be sequential

‐‐‐‐ Group definitions‐‐nvControllerGroup OBJECT‐GROUP

{

nvControllerResetAlarms OBJECT‐TYPESYNTAX INTEGER (0..1)MAX‐ACCESS read‐write

OBJECTS {nvControllerResetAlarms,nvControllerLocalRemote,nvControllerRFOnOffState,

STATUS currentDESCRIPTION"Reset alarms (any value will cause reset ‐ use 1)"::= { nvController 7 },

nvControllerMainExciter,nvControllerActiveExciter,nvControllerAutoExciterChangeovers,

{ }

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SNMP GROUP DEFINITIONS 

Numbering may not always be sequential

‐‐‐‐ Group definitions‐‐nvControllerGroup OBJECT‐GROUP

{

nvControllerLocalRemote OBJECT‐TYPESYNTAX LocalRemoteMAX‐ACCESS read‐only

OBJECTS {nvControllerResetAlarms,nvControllerLocalRemote,nvControllerRFOnOffState,

STATUS currentDESCRIPTION"Local/remote control (0 = local, 1 = remote)"::= { nvController 8 },

nvControllerMainExciter,nvControllerActiveExciter,nvControllerAutoExciterChangeovers,

{ }

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SNMP GROUP DEFINITIONS 

Numbering may not always be sequential

‐‐‐‐ Group definitions‐‐nvControllerGroup OBJECT‐GROUP

{

nvControllerRFOnOffState OBJECT‐TYPESYNTAX OnOffMAX‐ACCESS read‐write

OBJECTS {nvControllerResetAlarms,nvControllerLocalRemote,nvControllerRFOnOffState,

STATUS currentDESCRIPTION"RF On/Off state (0 = OFF, 1 = ON)"::= { nvController 35 },

nvControllerMainExciter,nvControllerActiveExciter,nvControllerAutoExciterChangeovers,

{ }

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SNMP COLUMNAR VS. SCALAR OBJECTS 

Objects that have a single instance in a given piece of equipment are generally treated as “scalar” (singular)

Example: Object that reflects the software version of the equipment

Other objects may have multiple occurrences and areOther objects may have multiple occurrences, and are treated as “columnar”, and arranged in a virtual table

Example: connection status and other information from each of the 32 kports on a network router.

Index values typically define the columns and rows of the virtual table

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SNMP COLUMNAR VS. SCALAR OBJECTS 

Columnar

Index values

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SNMP COLUMNAR VS. SCALAR OBJECTS 

Scalar

Direct OIDs for each object

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SNMP – VIRTUAL TABLES AND INDEX VALUES

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SNMP – VIRTUAL TABLES AND INDEX VALUES

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SNMP – TRAP OBJECTS

IMPORTSi l i i i l dDisplayString, TimeStamp, TimeInterval, TestAndIncr, AutonomousTypeFROM SNMPv2‐TCenterprisesFROM RFC1155‐SMIOBJECT‐TYPEFROM RFC‐1212TRAP‐TYPEFROM RFC 1215FROM RFC‐1215;

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RFC 1215

TRAP‐TYPE MACRO ::= 

BEGIN 

TYPE NOTATION ::= "ENTERPRISE" value 

(enterprise OBJECT IDENTIFIER) 

VarPart

DescrPart

ReferPart

VALUE NOTATION ::= value (VALUE INTEGER) 

VarPart ::= "VARIABLES" "{" VarTypes "}" 

| empty 

VarTypes ::= VarType | VarTypes "," VarType

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SNMP – TRAP OBJECTS

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SNMP – TRAP OBJECTS – KEY ITEMS

TRAP‐TYPE

Description

VariablesEach variable is the name of another OID in theEach variable is the name of another OID in the equipment

Names and values of each variable will be sent with the trapthe trap 

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SNMP – TRAP OBJECTS

upsTrapOnBattery TRAP‐TYPEENTERPRISE sp1DESCRIPTIONDESCRIPTION"The UPS has switched to battery backup power."

::= 1

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SNMP EXAMPLE #1 – FIBEAIR IP MICROWAVE LINK

Simple device

Simple MIB?

NOTMIB file is 288 pages!

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SNMP EXAMPLE #1 – FIBEAIR IP MICROWAVE LINK

CERAGON‐MIB DEFINITIONS ::= BEGIN‐‐Title:     CERAGON   MIB

‐‐ Copyright 1997 CERAGON.‐‐ All Rights Reserved.

‐‐ It is CERAGON's intent to encourage the widespread use of‐‐ this Specification in connection with the management ofCERAGON' d t CERAGON t d d‐‐ CERAGON's products. CERAGON grants vendors, end‐users,

‐‐ and other interested parties a non‐exclusive license to‐‐ use this Specification in connection with the management‐‐ of CERAGON's products.

‐‐ This Specification is supplied "as is " and CERAGON makesThis Specification is supplied  as is,  and CERAGON makes‐‐ no warranty, either express or implied, as to the use,‐‐ operation, condition, or performance of the Specification.

IMPORTSCounter, enterprises,IpAddress, Gauge       FROM RFC1155‐SMIDisplayString, ifIndex FROM RFC1213‐MIBOBJECT‐TYPE                     FROM RFC‐1212TRAP‐TYPE                       FROM RFC‐1215;

‐‐ Gauge32                    FROM SNMPv2‐SMI;sonetSectionCurrentStatus FROM SONET MIB

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MIB BROWSER ORIENTATIONSelected OID

Agent IP addressFunction controls

MIB tree

Results table

D i i f l d OIDDescription of selected OID

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SNMP EXAMPLE #1 – FIBEAIR MIB IN MIB BROWSER

Different branches

Some are simple

Others get complex

Could WALK the MIBData overload 

Many tablesa y ab es

Pick and choose OIDs

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FIBEAIR MIB TRYING A GET COMMAND

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SNMP EXAMPLE #1 – FIBEAIR IP “MINI WALK”

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COLUMNAR VALUES – INDEX IS THE KEY

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COLUMNAR VALUES – INDEX IS THE KEY

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COLUMNAR VALUES – INDEX IS THE KEY

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SNMP EXAMPLE #2 – LEIBERT HVAC SYSTEM

Mutiple MIBSlgpEnvConfigInfaredFlushRate OBJECT‐TYPE

SYNTAX      Unsigned32

UNITS       "percent"

MAX‐ACCESS  read‐write

STATUS      current

DESCRIPTION

"The Infrared humidifier pan overfill rate.  This parameter configuresp p g

the amount of water that flows into the humidifier pan when the

'humidifier is in operation."

::= { lgpEnvConfig 28 }{ gp g }

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SNMP EXAMPLE #2 – LEIBERT HVAC SYSTEM

MIB browser to the rescue!

Find the OIDs you need

Test with a GET command

See results

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LIEBERT HVAC SYSTEM – VIEW FROM NYC

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SNMP EXAMPLE #3 – TOSHIBA UPS SYSTEM

Example unit is a Toshiba G8000 series UPS system

How do we know?

Ask the unit!Ask the unit!

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SNMP EXAMPLE #3 – TOSHIBA UPS SYSTEM

Toshiba MIB Ichi Ban!R bl i dReasonably sized

42 pages

Well organized

Logical categories

Thorough descriptions

Minimal use of tables

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SNMP EXAMPLE #4 – NAUTEL NV TRANSMITTER

SNMP ready 

Software update

2 MIB filesNautel generalNautel general

NV specific

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NAUTEL NV MIB FILE IN BROWSER

“Easy” MIBNo tables

No traps

Two object groupsTwo object groupsController

Active Exciter

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MIB BROWSER ORIENTATIONSelected OID

Agent IP addressFunction controls

MIB tree

Results table

D i i f l d OIDDescription of selected OID

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NAUTEL NV TRANSMITTER – GET SINGLE OID

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NAUTEL NV – A WORTHWHILE WALK 

MIB is mostly scalar and Agent software is fast

Over 100 parameters collected in a few secondsOver 100 parameters collected in a few seconds

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NAUTEL NV – ACTIVE EXCITER GROUP 

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SNMP AGENTS THAT RIDE THE SHORT BUS

Not all SNMP Agents are created equal

Many SNMP Managers are capable of sending GET commands with many OIDs in a single PDU

Some Agent devices are not capable of responding quickly enoughSome Agent devices are not capable of responding quickly enough

Example: Nautel VS1 transmitter

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VS1 – UNUSED OIDS IN THE MIB FILE

VS1 uses same MIB as VS2.5Not all of the OIDs are supported

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NAUTEL VS1

Reduce number of objects being polled

Slow down polling so Agent has time to respondScripteasy flexible, can poll high priority objects at a higher rate than othersothers

Starting with just a few objects, and testing for performance

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NAUTEL VS1 – LIVE DISPLAY WORK IN PROGRESS

Run AVI file

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PAQ4411.1

THANK YOUTHANK YOU

Tony PeterleManager

Worldcast Systems Group, Miami FL(305) [email protected]

Thanks also to Josh Hadden, Clear Channel, New York

Using SNMP in Broadcast Facility Control – El Paso Ennes conference 05/18/2012

Doug Irwin, Clear Channel, New YorkNautel corporation