How to make NSO discover devices using CDP or LLDP

[AlaeddineJebnoun90723]

Hi,

I want to make NSO discover the architecture of the network (Mapping between differents nodes) is there any way to do this using LLDP/CDP or any other alternative.

Currently I am using a static mapping that specify the connection between the interfaces of the devices but this method is not good because I can't detect changes when a connection between two devices is changed.

[Alexander Stevenson]

Hello,

I'm not an expert in this area, but I've searched and found that there’s a discovery package shipped with NSO, documentation is available under:

/opt/ncs/ncs-<version>/packages/tools/discovery/doc/discovery_user_guide.pdf

Here's a nice discussion about Service discovery using NSO. Even if you can't find your answer, there are several experts in this area listed there.

[AlaeddineJebnoun90723]

Thank you for your reply Alextev,

The discovery package is not present in the 5.3 version of NSO and I'm looking for a way to discover devices and not services. That's mean how are the devices connected to each other (For exemple device1 interface Gig0/0 is connected to device2 Gig1/2).

[Alexander Stevenson]

You're welcome @AlaeddineJebnoun90723  . I did notice that what I was offering was about services instead of devices. I thought there was a chance it might help you. Luckily, the reply below seems to be very promising!

[rogaglia]

The discovery package was/is about discoverying nodes in the management network to onboard them in NSO. I believe the ask here is how to use NSO to get CDP/LLDP neighboring relationship. I did write a small package for that using NSO live-status capabilities. Moreover, depenending on the device vendor, this may be available already in the NED. For Cisco IOS try:

"admin@ncs# show devices device test live-status cdp neighbors"

That should give you the list of neighbors for that device. You can then use an action in python to create the logic that you wish.