Discovering devices using Layer2 maps

How to draw Layer 2 maps?

OpManager allows you to discover Layer2 devices that are connected to your network and draws a visual representation of the same. This includes a detailed map of all the nodes, interconnected layers and port-to-port connectivity in addition to the interfaces.

To start discovering your layer2 devices, go to Settings > Discovery > Layer2 Discovery. This process can also be initiated from Maps > Layer 2 Maps > Create New.

Enter a name in the Layer2 Map Name section and proceed to type the IPv4 of your seed device in the Router IPv4 Address section.

Configure a seed device : A seed device is the core router or L3 switch in your network. The device must have SNMP-enabled so that OpManager is able to query the device and draw the links automatically. The seed device should have "ipForwarding" set to 1 for the OID - .1.3.6.1.2.1.4.1.0 and must have two or more interfaces. (identified by querying the OID - 1.3.6.1.2.1.4.20.1.1)

The seed router will be connected to a vast number of devices. If you wish to restrict your Layer2 Map to a certain IP range, enter their Start IP and End IP and press the ‘+’ icon. You can specify multiple such entries.

Discovery Mechanism:
OpManager supports multiple discovery protocols. Choose one (or more) that is implemented in your seed router/L3 switch. This will drastically reduce the time taken to discover the devices.

Schedule interval:
As changes happen to the networks frequently, OpManager allows you to configure an interval (in days) to re-draw the map. For instance, if a change happens once in a week, you can configure OpManager to re-draw the map every seven days. 

Set Uplink Dependency:
This option helps in avoiding multiple device-down alerts when the parent device is down. Besides the layer2 discovery window, Uplink Dependency can also be set from the Quick Configuration Wizard.

Note: Uplink Dependency happens only during Device Import and not during Layer2 Map discovery.

Credentials:
Choose the SNMP credentials required for the seed router to identify the devices. You can add new credentials from the Add Credentials button.

Layer-2-discovery

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