Hi So I have been using PRTG for just over a year and have run into an issue.

my snmp traffic sensors are not corresponding... on my core switch it states that over 300mb/s is going to my salve switch yet on my slave switch zero traffic is being recorded on all ports...

however I then added Sflow and get completely different results...

my snmp config on my hp procurve 2530-48G switches is as follows : 

snmp-server community "public" operator unrestricted

snmp-server contact "isp" location "Server Room"

I also ran the show snmp-server command and it displayed the following : 

 SNMP Communities

  Community Name                   MIB View Write Access
  -------------------------------- -------- ------------
  ######                          Operator Unrestricted
  ######                    Operator Restricted
  public                        Operator Unrestricted

 Trap Receivers

  Link-Change Traps Enabled on Ports [All] : All

  Traps Category                  Current Status
  _____________________________   __________________
  SNMP Authentication           : Extended
  Password change               : Enabled
  Login failures                : Enabled
  Port-Security                 : Enabled
  Authorization Server Contact  : Enabled



  Startup Config change         : Disabled
  Running Config Change         : Disabled
  MAC address table changes     : Disabled
  MAC Address Count             : Disabled

  Address                Community              Events   Type   Retry   Timeout
  ---------------------- ---------------------- -------- ------ ------- -------


 Excluded MIBs

as a side note... uptime sensors work and the snmp traffic sensors show disconnected and deactivated statuses but no traffic and CPU load snmp sensors return no such name for both snmp V1 and V2c....

here is an extract from your snmp tester tool : 

----------------------- New Test -----------------------
Paessler SNMP Tester 5.1.3
2015/07/10 07:33:46 AM (9 ms) : Device: 10.0.1.23
2015/07/10 07:33:46 AM (10 ms) : SNMP V2c
2015/07/10 07:33:46 AM (10 ms) : Uptime
2015/07/10 07:33:46 AM (31 ms) : -------
2015/07/10 07:33:46 AM (32 ms) : DISMAN-EVENT-MIB::sysUpTimeInstance = 1258318058 ( 145 days )
2015/07/10 07:33:46 AM (49 ms) : HOST-RESOURCES-MIB::hrSystemUptime.0 = No such object (SNMP error # 222) ( 0 seconds )
2015/07/10 07:33:46 AM (51 ms) : Done


----------------------- New Test -----------------------
Paessler SNMP Tester 5.1.3
2015/07/10 07:33:56 AM (3 ms) : Device: 10.0.1.23
2015/07/10 07:33:56 AM (4 ms) : SNMP V2c
2015/07/10 07:33:56 AM (5 ms) : 64Bit Counter
2015/07/10 07:33:56 AM (11 ms) : -------
2015/07/10 07:33:56 AM (12 ms) : In: 448478517398
2015/07/10 07:33:56 AM (19 ms) : Out: 100298092576
2015/07/10 07:33:56 AM (21 ms) : Done


----------------------- New Test -----------------------
Paessler SNMP Tester 5.1.3
2015/07/10 07:34:00 AM (5 ms) : Device: 10.0.1.23
2015/07/10 07:34:00 AM (9 ms) : SNMP V2c
2015/07/10 07:34:00 AM (11 ms) : 64Bit Counter
2015/07/10 07:34:00 AM (20 ms) : -------
2015/07/10 07:34:00 AM (23 ms) : In: 448478517398
2015/07/10 07:34:00 AM (30 ms) : Out: 100298092576
2015/07/10 07:34:00 AM (33 ms) : Done


----------------------- New Test -----------------------
Paessler SNMP Tester 5.1.3
2015/07/10 07:34:02 AM (6 ms) : Device: 10.0.1.23
2015/07/10 07:34:02 AM (11 ms) : SNMP V2c
2015/07/10 07:34:02 AM (14 ms) : 64Bit Counter
2015/07/10 07:34:02 AM (23 ms) : -------
2015/07/10 07:34:02 AM (33 ms) : In: 448478517398
2015/07/10 07:34:02 AM (43 ms) : Out: 100298092576
2015/07/10 07:34:02 AM (46 ms) : Done


----------------------- New Test -----------------------
Paessler SNMP Tester 5.1.3
2015/07/10 07:34:06 AM (11 ms) : Device: 10.0.1.23
2015/07/10 07:34:06 AM (16 ms) : SNMP V2c
2015/07/10 07:34:06 AM (22 ms) : 32Bit Counter
2015/07/10 07:34:06 AM (31 ms) : -------
2015/07/10 07:34:06 AM (34 ms) : In: 3186006130
2015/07/10 07:34:06 AM (42 ms) : Out: 583071329
2015/07/10 07:34:06 AM (45 ms) : Done


----------------------- New Test -----------------------
Paessler SNMP Tester 5.1.3
2015/07/10 07:34:11 AM (8 ms) : Device: 10.0.1.23
2015/07/10 07:34:11 AM (12 ms) : SNMP V2c
2015/07/10 07:34:11 AM (15 ms) : 32Bit Counter
2015/07/10 07:34:11 AM (33 ms) : -------
2015/07/10 07:34:11 AM (37 ms) : In: 3186006130
2015/07/10 07:34:11 AM (44 ms) : Out: 583071329
2015/07/10 07:34:11 AM (48 ms) : Done


----------------------- New Test -----------------------
Paessler SNMP Tester 5.1.3
2015/07/10 07:34:12 AM (9 ms) : Device: 10.0.1.23
2015/07/10 07:34:12 AM (13 ms) : SNMP V2c
2015/07/10 07:34:12 AM (18 ms) : 32Bit Counter
2015/07/10 07:34:12 AM (28 ms) : -------
2015/07/10 07:34:12 AM (33 ms) : In: 3186006130
2015/07/10 07:34:12 AM (43 ms) : Out: 583071329
2015/07/10 07:34:12 AM (48 ms) : Done

Additionally considering im compairing snmp to sflow here is my sflow config : 

sflow 1 destination 10.0.1.2

sflow 1 polling 2-52,Trk6 60

sflow 1 sampling 2-52,Trk6 50

I know its a mouthful!! but hey dont say I dont give enough information !!

Article Comments

Hi Ian,

Could you please forward some screenshots from the SNMP Traffic Sensors and from the sFlow Sensors to illustrate the different bandwidth values? Please forward the screenshots to support@paessler.com and refer to this knowledge base article.

Best regards


Jul, 2015 - Permalink

Hi There

Since posting this question I have found the issue.

The firmware on my switches were the issue I upgraded them and the issue was with the interface counters they were not updating and therefore reporting traffic to PRTG via snmp.

I do apologise about the inconvenience


Jul, 2015 - Permalink

Hi,

No worries, the hint to update the firmware might also be helpful to other users who encounter the same issue.

Best regards


Jul, 2015 - Permalink

Hi,

Could You provide some details about this not working and working firmware. I have quite similar problem with the same switch model.


Nov, 2015 - Permalink