Discovering devices in LAN using Layer2 Discovery

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How to use Layer2 Discovery to discover all the devices inside LAN?

To learn more about Layer2 Discovery, check out the video given below:

To start with, OpManager checks whether the given seed device is a Router or L3 Switch based on the below criteria,

The device must have two or more interfaces.

"ipForwarding" of the device must be set to 1.

OpManager queries the OIDs in following order : CDP/LLDP OIDs, next IP routing table, next if there is any switch connection it queries the Bridge MIB and then ARP cache table. If OpManager fails to get any device connection to the seed router/L3 switch, this error message "Device Mapping not exist for this Map name" will be displayed.

List of OIDs used for Layer2 Discovery :

BRIDGE-MIB :

.1.3.6.1.2.1.17.4.3.1.1

.1.3.6.1.2.1.17.4.3.1.2

.1.3.6.1.2.1.17.4.3.1.3

.1.3.6.1.2.1.17.1.4.1.1

.1.3.6.1.2.1.17.1.4.1.2

RFC1213.MIB (NetToMediaTable)

.1.3.6.1.2.1.4.22.1.1

.1.3.6.1.2.1.4.22.1.2

.1.3.6.1.2.1.4.22.1.3

.1.3.6.1.2.1.4.22.1.4

RFC1213 (IPRouteTable)

.1.3.6.1.2.1.4.21.1.1

.1.3.6.1.2.1.4.21.1.2

.1.3.6.1.2.1.4.21.1.7

.1.3.6.1.2.1.4.21.1.8

.1.3.6.1.2.1.4.21.1.11

CISCO-CDP.MIB

.1.3.6.1.4.1.9.9.23.1.2.1.1.4

.1.3.6.1.4.1.9.9.23.1.2.1.1.7

.1.3.6.1.4.1.9.9.23.1.2.1.1.9

LLDP.MIB

.1.0.8802.1.1.2.1.4.1.1.4

.1.0.8802.1.1.2.1.4.1.1.5

.1.0.8802.1.1.2.1.4.1.1.8

.1.0.8802.1.1.2.1.4.1.1.9

.1.0.8802.1.1.2.1.4.1.1.12

IF-MIB

ifIndex - .1.3.6.1.2.1.2.2.1.1

ifName - .1.3.6.1.2.1.31.1.1.1.1

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How to use Layer2 Discovery to discover all the devices inside LAN?

List of OIDs used for Layer2 Discovery :

Router Discovery Algorithm:

Active Directory
management Manage, track, and secure Active Directory

Identity governance
and administrationOrchestrate user identity management and access controls for Zero Trust

Privileged access
managementControl and secure privileged access to critical enterprise systems

Enterprise and IT service
managementDeliver a consistent employee experience across business functions

Customer service
managementBuild a one-stop portal for customers with efficient account management

IT asset
managementCentralize and automate the complete IT asset life cycle

Network and server
performance monitoringEnsure network, server, and storage reliability with AI-powered insights

IT incident
managementEfficiently manage and resolve IT incidents while ensuring transparency

Cloud-native solutions for IT managementMonitor, manage, audit, and secure your multi-cloud
and hybrid infrastructure