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Today's Topics:
1. Re: No nodes on some switches (Lavin, Michael (ITS))
--- Begin Message ---
In case anyone else sees a similar issue, I think the solution that is working
for my network is to have SNMP contexts added per VLAN on the switch.
It is not a Netdisco issue. It is a Cisco IOS SNMP V3 issue. To get the MAC
address tables with an SNMP v3 query you need:
snmp-server group yourV3groupName v3 priv context vlan- (vlanid)
configured on the switch, one context for every vlan.
From: Lavin, Michael (ITS)
Sent: Monday, June 26, 2023 10:36 AM
To: netdisco-users@lists.sourceforge.net
Subject: No nodes on some switches
Software Version
App::Netdisco 2.60.4
SNMP::Info 3.89
DB Schema 77
PostgreSQL 11.00.19
Perl 5.16.3
Some of my Cisco IOS devices are not reporting any connected nodes.
As an example, my own PC MAC address is showing up in the NetBIOS information
in Netdisco. The ARP IP mapping is working.
I know it is on port Gi1/0/43 of a switch. I see it when I do a "show mac
address-table" on the switch it is plugged into but when I MAC suck that switch
the debug shows:
[17164] 2023-06-26 13:41:08 debug [10.56.119.8:161] try_connect with ver: 3,
class: SNMP::Info::Layer3::C6500, comm: <hidden
...
[17621] 2023-06-26 13:56:21 debug [10.56.119.8] macsuck - stored 0 forwarding
table entries
[17621] 2023-06-26 13:56:21 debug [10.56.119.8] macsuck - removed 0 fwd table
entries to archive
I read this as no mac addresses are stored and the reports show no devices but
the phone on that switch. The phone information is collected via CDP/LLDP.
The switch is: Vendor / Model cisco / 36xxstack OS / Version ios-xe /
16.3.7
A similar situation occurs on many switches on my network. Others have
workstations and printers mapped to ports as expected. I see no pattern to the
models, vendors or OS of the devices where the Node information is different.
We use VRFs all over our network and I thought the issue was ARPNIP related,
but this MAC does have the IP mapped.
Any insight would be appreciated.
Thank you.
--- End Message ---
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