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Today's Topics:
1. Re: Meraki switches - MAC-to-port mapping issues (Oliver Gorwits)
--- Begin Message ---
Thanks Jeff, I have made a ticket in the snmp-info project so that we have
a note of this patch to add sometime
On Wed, 7 Apr 2021 at 07:24, Ashley Jeff <[email protected]>
wrote:
> Netdisco Team,
>
> We believe we figured out how to get this to work. We found information in
> other mailing list posts that suggested adding lines like these to the
> ~netdisco/perl5/lib/perl5/SNMP/Info.pm.
>
> *** Under the my %l3sysoidmap section:
> 29671 => 'SNMP::Info::Layer3::Meraki',
>
> *** Under the # Layer 3 Supported section:
> # Meraki MS225
> $objtype = 'SNMP::Info::Layer3::Meraki'
> if $desc =~ /^Meraki\sMS225/;
>
> Then we created a pm file in
> the ~netdisco/perl5/lib/perl5/SNMP/Info/Layer3 directory that includes a
> section like this:
>
> sub layers {
> return '00000110';
> }
>
> After re-running the discovery process on a group of Meraki switches, they
> now show up as Layer2 and Layer3 devices, and the MAC-to-IP per switch port
> functionality is working.
>
>
>
>
> *Jeff Ashley Infrastructure Services * Jefferson County Public Schools
>
>
>
> *1829 Denver West Dr. #27 Golden, CO 80401 PH 303-982-2219
> Website: http://www.jeffcopublicschools.org
> <http://www.jeffcopublicschools.org>*
>
> ------------------------------
> *From:* Ashley Jeff
> *Sent:* Monday, March 29, 2021 5:49 PM
> *To:* [email protected] <
> [email protected]>
> *Subject:* Meraki switches - MAC-to-port mapping issues
>
> Netdisco Team,
>
> We've successfully added various Cisco and Juniper devices to a new
> install of Netdisco, but we're having trouble getting our Meraki
> cloud-managed switches added such that we can search and find MAC to port
> mappings. We believe the problem is that they're not being discovered as
> layer2 or layer3 devices (They can function as either, but we're just using
> them as layer 2 devices). They support direct SNMP connections, and they
> support dot1dTpFdbTable queries. Here's output from snmpwalk from another
> server showing a Meraki device returning MAC table info.
>
> snmpwalk -v 2c -c xxxxxx x.x.x.x 1.3.6.1.2.1.17.4.3.1.1
>
> SNMPv2-SMI::mib-2.17.4.3.1.1.0.0.192.0.0.0 = Hex-STRING: 00 00 C0 00 00 00
> SNMPv2-SMI::mib-2.17.4.3.1.1.0.1.230.64.4.22 = Hex-STRING: 00 01 E6 40 04
> 16
> etc.
>
> Here's the result of the netdisco-do debug command that we've read about
> in the forums. We're guessing the issue is that they don't support
> sysServices, and the resulting layers output shows 00000000.
>
> ~netdisco/bin/netdisco-do show -DI -d x.x.x.x -e bp_inde
>
> [56339] 2021-03-29 22:48:03 info App::Netdisco version 2.047005 loaded.
> [56339] 2021-03-29 22:48:03 info show: [x.x.x.x]/bp_inde started at Mon
> Mar 29 16:48:03 2021
> [56339] 2021-03-29 22:48:03 debug show: running with timeout 600s
> [56339] 2021-03-29 22:48:03 debug => running workers for phase: check
> [56339] 2021-03-29 22:48:03 debug -> run worker check/_base_/0
> [56339] 2021-03-29 22:48:03 debug Show is able to run
> [56339] 2021-03-29 22:48:03 debug => running workers for phase: main
> [56339] 2021-03-29 22:48:03 debug -> run worker main/_base_/100
> [56339] 2021-03-29 22:48:03 debug snmp reader cache warm: [x.x.x.x]
> [56339] 2021-03-29 22:48:03 debug [x.x.x.x:161] try_connect with ver: 2,
> class: SNMP::Info::Layer3::Cisco, comm: <hidden>
> SNMP::Info::_global uptime : DISMAN-EVENT-MIB::sysUpTimeInstance :
> .1.3.6.1.2.1.1.3.0
> SNMP::Info::_global layers : SNMPv2-MIB::sysServices.0 : .1.3.6.1.2.1.1.7.0
> SNMP::Info::_global(layers) NOSUCHOBJECT at
> /home/netdisco/perl5/lib/perl5/App/Netdisco/Transport/SNMP.pm line 245.
> SNMP::Info::_global description : SNMPv2-MIB::sysDescr.0 :
> .1.3.6.1.2.1.1.1.0
> Device doesn't implement sysServices but did return sysDescr. Might give
> unexpected results.
> at /home/netdisco/perl5/lib/perl5/App/Netdisco/Transport/SNMP.pm line 223.
> SNMP::Info::_global id : SNMPv2-MIB::sysObjectID.0 : .1.3.6.1.2.1.1.2.0
> SNMP::Info 3.71
> SNMP::Info::device_type() layers:00000000 id:29671 sysDescr:"Meraki
> MS225-48FP Cloud Managed PoE Switch"
> SNMP::Info::_validate_autoload_method(bp_inde) Unable to resolve method.
> undef
> [56339] 2021-03-29 22:48:03 info show: finished at Mon Mar 29 16:48:03
> 2021
> [56339] 2021-03-29 22:48:03 info show: status done: Showed bp_inde
> response from x.x.x.x
>
> We're read through other posts suggesting modifications to the Info.pm
> file, and based on that, we've added these lines to the sections listed,
> which we think is reflected in the above output.
>
> my %l3sysoidmap = (
> 29671 => 'SNMP::Info::Layer3::Cisco',
>
> # These devices don't claim to have Layer1-3 but we like em anyways.
> truncated ... (Added in the middle of the section)
> # Meraki MS225
> $objtype = 'SNMP::Info::Layer3::Cisco'
> if ( $desc =~ /Meraki MS225-48FP Cloud Managed PoE Switch/i );
>
> Nothing so far has resulted in the devices showing L2 or L3 capabilities
> in the debug output or the GUI. We are able to run discovery on groups of
> Meraki devices, assumedly using SNMP discovery on one device and then CDP
> to discover other connected devices that subsequently get populated with
> SNMP info. We also do see MAC addresses listed on ports on the Meraki
> switches in the Netdisco GUI, but when we search for those MAC addresses in
> the main search window, they show up on the trunk port on the parent
> Juniper device rather than the Meraki device that they're directly plugged
> into - and to confirm, that's based on a MAC address search and not an
> IP/arp search. MIB support for Meraki devices is pretty limited, but we're
> hoping we can pull the general info from the SNMPv2-MIBs and get searchable
> MAC addresses down to the Meraki ports. Is there a way to get these devices
> to populate that info into Netdisco?
>
> Thanks for the help,
> Jeff
> _______________________________________________
> Netdisco mailing list
> [email protected]
> https://sourceforge.net/p/netdisco/mailman/netdisco-users/
--- End Message ---
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