Contents
About this publication ......................................................................................................................5
Intended audience .......................................................................................................................................... 5
What this publication contains ..................................................................................................................... 5
Conventions used in this publication........................................................................................................... 5
Related publications....................................................................................................................................... 6
Chapter 1 Introduction......................................................................................................................8
Chapter 2 Discovery ........................................................................................................................10
Overview........................................................................................................................................................ 10
How the discovery process works.............................................................................................................. 11
The discovery phases ......................................................................................................................... 11
Interrogating devices ......................................................................................................................... 11
Resolving addresses ........................................................................................................................... 11
Downloading connections ................................................................................................................. 12
Correlating connectivity .................................................................................................................... 12
Discovery Best Practice tips......................................................................................................................... 12
Use the standard documentation as your reference point............................................................. 13
Plan your discovery in a phased approach ..................................................................................... 13
Define what you plan to monitor ..................................................................................................... 14
Questions to ask before discovery.................................................................................................... 14
Scoping the discovery .................................................................................................................................. 15
Sparsely populated class A or class B networks ............................................................................. 15
Initially only discover a limited number of layer 2 and layer 3 devices...................................... 15
Break up large networks.................................................................................................................... 15
IPv4/IPv6............................................................................................................................................. 15
Seeds 15
Noisy routers....................................................................................................................................... 16
Use file and ping finders to intelligently seed your network........................................................ 16
Ping finders.......................................................................................................................................... 16
File finders ........................................................................................................................................... 17
Agents ............................................................................................................................................................ 17
Full discovery agents.......................................................................................................................... 17
Partial discovery agents ..................................................................................................................... 18
Increase the number of threads on heavily used agents................................................................ 19
Filters.............................................................................................................................................................. 19
Prediscovery filters............................................................................................................................. 19
Sensitive nodes.................................................................................................................................... 20
Post discovery ..................................................................................................................................... 20
Helpers........................................................................................................................................................... 20
Additional discovery configuration ........................................................................................................... 21
Passwords ............................................................................................................................................ 21
DNS 21
NAT 21
Advanced............................................................................................................................................. 21
Running a discovery............................................................................................................
......................... 22
Can anything go wrong ?................................................................................................................... 22
To restart with a clean database........................................................................................................ 23
Working with OQL....................................................................................................................................... 23
Verifying the topology and resolving issues............................................................................................. 24
Simple checklist if things go wrong ................................................................................................. 24
Determine agent state......................................................................................................................... 24
Run DEBUG......................................................................................................................................... 25
If discoveries take too long................................................................................................................ 25
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