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Today's Topics:
1. Re: auto-discovery (Stuart Kendrick)
--- Begin Message ---
OK, I don’t have a coherent story to tell, can someone help me fill this out?
I got distracted for a few days, returned to this thread … and found that my
Inventory is now populated with what I would expect, i.e. a quick glance
suggests that Netdisco has found most if not all of my Devices
* How does Netdisco get started? How does it find the first device to
query using SNMP (from which it then starts examining CDP/FDP/LLDP tables to
figure out where to go next)?
* And does Netdisco use other techniques to find Devices? E.g. consult RIP
/ OSPF / EIGRP … tables to find ‘neighbors’?
To answer your specific question: 10.1.2.3 is a Linux box (my desktop
machine). It happens to run LLDPd … and see its local Ethernet switch as a
neighbor (although I would claim, with some doubt around the unreliability of
my memory, that Inventory stayed empty for a day or two, even after I had
manually pointed netdisco-do at it, to produce the output I posted).
If I understand Dominik correctly, installing Netdisco involves the process
described here https://metacpan.org/pod/App::Netdisco#Installation and then, in
fact, one must run a netdisco-do (via CLI or GUI) to discover the first device
… and assuming that this first device can start walking the CDP/FDP/LLDP chain,
then much progress will then occur.
If this is the case, then I propose adding a ‘First Run’ section similar to the
following:
First Run
After installing Netdisco for the first time, you must manually discover at
least one device on your network. To do this, perform the following step:
~/bin/netdisco-do discover -D {name or IP address of a switch or router}
Choose a device which speaks CDP, FDP, or LLDP and thus knows about its
neighbors; Netdisco will then start following this chain of neighbors to
discover the rest of your network
Upgrading from 2.x
--sk
From: Oliver Gorwits <[email protected]>
Sent: Monday, September 9, 2019 3:21 AM
To: [email protected]
Subject: Re: [Netdisco] auto-discovery
CAUTION: This email originated from outside the Allen Institute. Please do not
click links or open attachments unless you've validated the sender and know the
content is safe.
________________________________
Hi Stuart
I agree with Dominik. Looking a the logs from your earlier emails, these are
relevant:
[18523] 2019-09-08 11:22:21 debug
[10.1.2.3:161<https://nam05.safelinks.protection.outlook.com/?url=http%3A%2F%2F10.1.2.3%3A161&data=02%7C01%7C%7Cf935151f10b04f49b06d08d7351381b7%7C32669cd6737f4b398bddd6951120d3fc%7C0%7C0%7C637036230234487769&sdata=6IplQxMxdhGRkCuOtYRjEvyau9rcCTXNhjugjBLNEgw%3D&reserved=0>]
try_connect with ver: 2, new class: SNMP::Info::Layer3::NetSNMP, comm: <hidden>
in the above line we see that the device is only being identified as a generic
system, and results would be better if there were an SNMP::Info specific class
for the device model (e.g. Layer3::C6500). Can you share the device/model being
discovered?
[18523] 2019-09-08 11:22:21 debug [10.1.2.3] interfaces - added 1 new
interfaces
Surprising that there is only one interface on this switch/router, or is it a
server or VM?
[18523] 2019-09-08 11:22:21 debug [10.1.2.3] neigh - neighbor protocols are
not enabled
And finally, here is where Dominik mentions the CDP/FDP/LLDP needing to be
enabled. They are protocols for walking the network from device to device.
Perhaps reading this will help:
https://github.com/netdisco/netdisco/wiki/Troubleshooting#understanding-nodes-and-devices<https://nam05.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fnetdisco%2Fnetdisco%2Fwiki%2FTroubleshooting%23understanding-nodes-and-devices&data=02%7C01%7C%7Cf935151f10b04f49b06d08d7351381b7%7C32669cd6737f4b398bddd6951120d3fc%7C0%7C0%7C637036230234497761&sdata=xsgS6BNP%2FqaQY1GRhCaMnrEggfVYGU3VekQbdRzVajM%3D&reserved=0>
Good luck!
regards,
oliver.
On Mon, 9 Sep 2019 at 10:40, Mueller, Dominik
<[email protected]<mailto:[email protected]>> wrote:
Hi Stuart,
I think the problem is, that a Macwalk and Discoverall will not bring the
desired outcome.
You have to add at least one device which utilizes lldp (CDP, FDP, etc...) to
autodiscover other devices.
Otherwise you have to insert all devices in a crontab.
Best regards
Dominik Müller
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