Spectrum is creating connections to Pingables on virtual interfaces

Products

• CA Spectrum
• DX NetOps

Issue/Introduction

We have noticed that there are pingable models that may or may not be connected to other devices even though the layer 3 device that contains the pingable mac address is not modeled.  How is this connection being made?

Cause

Functioning as designed.

Resolution

Spectrum will create a connection from a Pingable to a Router or Switch interface model if:

The interface iftype is 53 - propVirtual
There is an IP address assigned to that interface
The IP of the Pingable is within that interfaces IP Mask range.
The discover connections is run from the Pingable model.

For example:

Device A has interface with index 22 and iftype 53 with an IPaddress of 192.168.1.1
Device A has a deviceIpMaskList with instance id of 4.192.168.1.1.0.0.0.0.1.1 and a mask of 255.255.255.0
A pingable device is created with IP of 192.168.0.25 and "Discover Connections" is used, or after the model is created, right click - Reconfiguration - Rediscover Connections.

Spectrum will create the connection between the Pingable and Interface 22.