Autodiscovery
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AutoDiscovery. Device Attributes Discovery Ports Discovery CDP Neighbours Discovery Layer 3 Hosts Discovery. Introduction. Reliable monitoring and efficient use depends on the accuracy of the entered data that describe the network and the network devices. AutoDiscovery function aims:

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AutoDiscovery

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Autodiscovery

AutoDiscovery

Device Attributes Discovery

Ports Discovery

CDP Neighbours Discovery

Layer 3 Hosts Discovery


Introduction

Introduction

  • Reliable monitoring and efficient use depends on the accuracy of the entered data that describe the network and the network devices.

  • AutoDiscovery function aims:

    • Easing the initial database population

    • Updating - topology, new devices and relevant data

  • Discovery on hop-by-hop basis

    • Better overview and control over the process

    • No retrieval of the entire network

    • Possibility of clear database organisation in the system


Autodiscovery

Location 1

Router 1

Location A

Serial 0

Serial 0

Serial 1

Router A

Serial 1

M

M

PC1

PC5

Router A

PC2

PC4

Router B

PC3

Router C

Router A1

Router D

Router A2

Router A3

Router A3

LocationA3

  • notes


Principles

Principles

  • AutoDiscovery functions are performed on the Device objects or their Ports

  • Data is read and retrieved via SNMP

  • Result are shown in the Message panel

  • AutoDiscoveryfunctions perform following actions:

    • Attempts to find the discovered Devices in the database

      • Device already exists in the database -> update of the object properties and Links

      • Device does not exist in the database -> Device is created in the Discovered Folder, located underneath the Device on which the AutoDiscovery service was initialised.

    • Links are being set to the discovered Devices/Ports, depending on the type of initialized AutoDiscovery function.


Device attributes discovery

Device Attributes Discovery

  • Setting the Name information for every SNMP enabled device

  • For Cisco Systems devices, finds serial number and model information

  • Plans for the future…

    • Deeper and intelligent analysis

    • Discovering type of the device and manufacturer

    • Discovering device attributes (type of hardware, type of OS, memory and storage size…)


Ports discovery

Ports Discovery

  • Discovers all network interfaces (ports) with following attributes:

    • short and full name of the port

    • description of the port

    • bandwidth

    • SNMP ID

  • Port objects are updated or created under the Device in the information system hierarchy and each Port is linked to the parent Device

  • SNMP ID – index to member in OID list - the most important port attribute

  • Optional selection of automatic PortDiscovery function on the Devices on daily basis

  • Persistent interface indexes


Cdp neighbours discovery

CDPNeighbours Discovery

  • Based on CDP (Cisco Discovery Protocol)

    • Discovering neighbour devices

    • Creating the Links between Devices

  • CDP offers the information about models of these devices, as well as connected ports

  • The final result is creating Links between two Ports of neighbouring Devices, which represents the topological connection in this part of the computer network

  • Cisco only up to now - waiting for the Link Layer Discovery Protocol (LLDP) and MIB…


Layer 3 hosts discovery

Layer 3 Hosts Discovery

  • Started on routers (Layer 3 device) or router ports

  • Discovers all IP address of end devices (hosts) on adhering local segments (sub-networks)

  • Based on ARP table

  • NetIIS system gets the address range in the adhering sub-network. This address range is pinged, in order to refresh the router’s ARP table, from where IP and MAC addresses of end devices are retrieved

  • NetBIOS and DNS names are requested from host devices, which are set in the Device name

  • A new object type Device is created within the Discovered Folder, which presents the local sub-network, under a name based on the IP address and length of the mask split with an under score (e.g. 10.1.2.0_24)


Autodiscovery summary

AutoDiscoverySummary

Device Attributes Discovery

Ports Discovery

CDP Neighbours Discovery

Layer 3 Neighbours Discovery


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