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Today's Topics:
1. Re: Can I easily patch Netdisco or SNMP to add neighbors?
(Brian Marshall)
--- Begin Message ---
What I've done in the past for device classes that don't play nicely
with lldp or snmp for some reason, but that I can map in some other way,
is to autocreate entries in the manual topology table, eg :
insert into topology (dev1, port1, dev2, port2) values ('192.168.3.4',
'wlan0', '192.168.3.8', 'wlan0');
remember to create the link in both directions for netdisco to create
bidirectional links (unfortunately it won't fall back on the logical
thing if a link only exists in one direction)
you can script this via the psql command something like :
psql -c "insert into..."
you can put a sudo -u netdisco in front of the psql to execute as the
netdisco user and make the db permissions stuff easier
If you have an easy way to pull info, then processing it with
grep/cut/sed/awk and feeding it to xargs -n1 to drive psql or something
works wonders with little effort. I have dozens of scripts that feed
into or are fed from the netdisco DB.
On 08/02/2018 03:13 PM, [email protected] wrote:
I'm feeling pretty dense here, but how does this become active? I
wasn't aware it would use those protocols (note to self: Read the
release notes!) I'm running that code, and use eigrp, and I don't see
signs it is doing anything.
For example, I have nodes connected over a microwave ring that passes
eigrp and shows neighbors, but does not pass lldp or cdp. Shouldn't I
see that as neighbors and connected devices from eigrp on the VLAN
interface they connect to? I don't. I'd like to.
Though it's an interesting question - I have other places where LLDP
divisible devices are in between EIGRP neighbors, and don't really want
to see them come up as connected.
I tried briefly to see if there is control in deployment.yml or elsewhere.
I can do (now that I see it) a show of -e eigrp_peers and get the right
answers, but I don't see that info being used anywhere in terms of the
neighbors display? Or ports (though the show doesn't show the VLAN
interface).
Thanks for pointing to this. Would love to understand it better.
Linwood
-----Original Message-----
From: Nick Nauwelaerts [mailto:[email protected]]
Sent: Thursday, August 2, 2018 4:07 PM
To: [email protected]; [email protected]
Subject: RE: [Netdisco] Can I easily patch Netdisco or SNMP to add
neighbors?
heya,
while i'm far from the expert on this, i have a somewhat related todo
item (netdisco should be able to map 2 stage routing dependencies
iirc). as such, since you're talking about ip adresses i guess it's
somehow routed or black box enough to be considered as routed.
as such, perhaps its easiest to plug your data into:
https://github.com/netdisco/netdisco/blob/master/lib/App/Netdisco/Worker/Plugin/Discover/Neighbors/Routed.pm
and emulate ospf or bgp handling.
https://metacpan.org/pod/SNMP::Info::Layer3 seems a plausible starting
point for that.
hopefully someone with a decent understanding of netdisco workings can
comment.
// nick
-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Thursday, August 2, 2018 21:01
To: [email protected]
Subject: [Netdisco] Can I easily patch Netdisco or SNMP to add neighbors?
We have a bunch of microwave devices (NEC iPaso) that do not behave
nicely with LLDP, or pulling port info generally.
But they do have an OID from which I can pull neighbors over the
microwave network, it just provides a list of adjacent IP addresses,
which correspond to discovered hosts, that it does on its own management
microwave network. I can probably find the adjacent port as well
(corresponding to the radios).
Is there any easy way to inject such into Netdisco's discover (or
whatever appropriate place)? or associated SNMP code? Currently the
SNMP class is SNMP::Info::Layer2. The neighbor information is in a
proprietary mib.
I don't want to fork the snmp code to produce a class specifically for
them, as (a) I've never done it and it's a lot of work, and (b) I can't
do it publically as NEC won't release their MIB's except under NDA.
I was wondering if there are any hooks in the code where one can easily
add an additional call just for neighbor information, to a proprietary
place?
Yes, I know I can add manual topology, but the obvious risks of that are
as changes occur, someone as to remember to go fix it.
Linwood.
PS. Would you consider flagging (color, icon, something) manual topology
on the ports display and neighbor graph, so one can remember what they
have done (and not) manually?
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