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AutoDiscovery - PowerPoint PPT Presentation


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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

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
slide3
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