Problem with snmp (ASR-1001X)

[matou]

Hello,

I'm having a problem with an asr1001-x on snmp-server. The collector (librenms) returned me errors on graphs.

I looked while doing an "snmp show" :

328968055 SNMP packets input
308 Bad SNMP version errors
523726 Unknown community name
693 Illegal operation for community name supplied
29063 Encoding errors
22536310 Number of requested variables
0 Number of altered variables
4516201 Get-request PDUs
274868 Get-next PDUs
693 Set-request PDUs
70944914 Input queue packet drops (Maximum queue size 1000)
257436224 SNMP packets output
0 Too big errors (Maximum packet size 1500)
48477 No such name errors
0 Bad values errors
0 General errors
229599836 Response PDUs
0 Trap PDUs
Packets currently in SNMP process input queue: 1000
SNMP global trap: disabled

I have execute "no snmp-server" and "write" the config, and  I have reconfigure (snmp-server group,etc.....).but I still have the same results (show snmp) and librenms cannot add the device.

How to resolve this error?

Thank you

Matt

[marce1000]

                                      >...523726 Unknown community name
 - For starters have a manual snmp query check with snmpget or snmpwalk with the community intended and configured on  librenms

 M.

[Giuseppe Larosa]

Hello @matou ,

examining the output of show snmp we can notice also:

>> 70944914 Input queue packet drops (Maximum queue size 1000)

>> Packets currently in SNMP process input queue: 1000

And:

>> 328968055 SNMP packets input
308 Bad SNMP version errors
523726 Unknown community name

I would say that likely your router has a software bug with SNMP packets filling the input queue and dropped so you should consider an IOS XE sofware upgrade.

As noted by @marce1000  there can also be a problem of SNMP community used on your SNMP NMS software, but the high numbero of drops in the input queue is a sign of a software issue in the device related to SNMP.

if you post a show version it is possible to make a search for a possible bug.

Hope to help

[matou]

Hello @Giuseppe Larosa 

Yes,

Cisco IOS XE Software, Version 16.06.04
Cisco IOS Software [Everest], ASR1000 Software (X86_64_LINUX_IOSD-UNIVERSALK9-M), Version 16.6.4, RELEASE SOFTWARE (fc3)
ROM: IOS-XE ROMMON

System returned to ROM by reload
System restarted at 17:22:44 CET Wed Jan 18 2023
System image file is "bootflash:/asr1001x-universalk9.16.06.04.SPA.bin"

License Type: Permanent
License Level: adventerprise
Next reload license Level: adventerprise

cisco ASR1001-X (1NG) processor (revision 1NG) with 6934176K/6147K bytes of memory.
Processor board ID FXS2513Q1TM
6 Gigabit Ethernet interfaces
2 Ten Gigabit Ethernet interfaces
32768K bytes of non-volatile configuration memory.
16777216K bytes of physical memory.
6553599K bytes of eUSB flash at bootflash:.
0K bytes of WebUI ODM Files at webui:.

Configuration register is 0x2102

SNMP has been working well for 2 years. And about 3 weeks ago I started seeing incorrect graphs on

Thank you