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Bandwidth Monitoring - Link Utilization

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Hi Team,

Just needed your help on one of issue I think m facing with PRTG tool.

We are using the tool to monitor out Internet Link bandwidth. We have a dedicated 120 Mbps link terminated on Cisco Router. We are using "SNMP Traffic 64bit sensor". There are times when the graph generated by the tool shows the current bandwidth to be 143,630kbp/s ( which is much above then our link bandwidth ).

Also when we check the traffic in/out on the router Interface its much below then what graph shows.

Could you please help me on the same and let me know if there is some misconfiguration at my side.

prtg snmp-traffic-sensors traffic-sensor

Created on Jan 29, 2015 9:04:31 AM by  rohit88sood (0) 1



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Please do an interface scan with the SNMP Tester and find the OIDs or ID for the interface that you are trying to monitor. Once you have that, use the tester again to scan for the OID or using the index number to scan that interface specifically a few times and then post the data here. It's likely that the Cisco device's SNMP system is delivering incorrect values, but we will be able to see that with the tester values.

Created on Jan 30, 2015 11:55:03 AM by  Greg Campion [Paessler Support]



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Hi Greg,

Below is the output from scan of one of our router interfaces. I am not much aware of the OID thing so could not actually get the out for OID as stated. Your help to get the same would be much appreciated.

Also On this router we have to Active Physical Interfaces :

1. Gi0/0 - Description *** 120 Mb Vodafone Link ***  ( Actual Link Termination Link )
2. Gi0/1/0 -- ( LAN side Interface )
____________________________________________________________________________

Created on Feb 2, 2015 3:53:03 AM by  rohit88sood (0) 1

Last change on Feb 3, 2015 9:26:19 AM by  Greg Campion [Paessler Support]



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Can you tell me which interface you are using for your internet connection? The name or number should be fine.

Created on Feb 2, 2015 4:23:46 PM by  Greg Campion [Paessler Support]



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The interface is GigabitEthernet0/0 with description * 120 Mb Vodafone Link *

Created on Feb 3, 2015 4:39:38 AM by  rohit88sood (0) 1



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At the very end of a scan, there should be a small table that lists all of the interfaces and the OIDs for their in and out traffic OIDs. It should look something like this

Testing standard interfaces...
Test 3:Adaptive Security Appliance 'EXTERNAL' interface (1.3.6.1.2.1.31.1.1.1.6.3,1.3.6.1.2.1.31.1.1.1.10.3): in=6381562981236  out=1353331996021
Test 4:Adaptive Security Appliance 'INTERNAL' interface (1.3.6.1.2.1.31.1.1.1.6.4,1.3.6.1.2.1.31.1.1.1.10.4): in=1225374426086  out=6438252901526
Test 5:Adaptive Security Appliance 'DMZ' interface (1.3.6.1.2.1.31.1.1.1.6.5,1.3.6.1.2.1.31.1.1.1.10.5): in=320  out=427520

The OIDS 1.3.6.1.2.1.31.1.1.1.6.3 / 1.3.6.1.2.1.31.1.1.1.10.3 are the two OIDs for in and out respectively. In the last posting the table at the end was not there so I cannot say which OIDs you need to use but they should be at the end of an interface scan.

Created on Feb 3, 2015 9:29:11 AM by  Greg Campion [Paessler Support]



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Hi Greg,

PFB the output for the table you were stating earlier :

Testing standard interfaces...
Test 1:Backplane-GigabitEthernet0/3 (1.3.6.1.2.1.2.2.1.10.1,1.3.6.1.2.1.2.2.1.16.1): in=2911306045  out=3702591483
Test 2:*** 120 Mb Vodafone Link *** (1.3.6.1.2.1.2.2.1.10.2,1.3.6.1.2.1.2.2.1.16.2): in=2890749788  out=702965453
Test 3:GigabitEthernet0/1 (1.3.6.1.2.1.2.2.1.10.3,1.3.6.1.2.1.2.2.1.16.3): in=0  out=0
Test 4:GigabitEthernet0/2 (1.3.6.1.2.1.2.2.1.10.4,1.3.6.1.2.1.2.2.1.16.4): in=0  out=60
Test 5:ISM0/0 (1.3.6.1.2.1.2.2.1.10.5,1.3.6.1.2.1.2.2.1.16.5): in=0  out=292
Test 6:ISM0/1 (1.3.6.1.2.1.2.2.1.10.6,1.3.6.1.2.1.2.2.1.16.6): in=330284541  out=4777313
Test 7:Embedded-Service-Engine0/0 (1.3.6.1.2.1.2.2.1.10.7,1.3.6.1.2.1.2.2.1.16.7): in=0  out=0
Test 8:Serial0/0/0 (1.3.6.1.2.1.2.2.1.10.8,1.3.6.1.2.1.2.2.1.16.8): in=0  out=0
Test 9:Serial0/0/1 (1.3.6.1.2.1.2.2.1.10.9,1.3.6.1.2.1.2.2.1.16.9): in=0  out=0
Test 10:** Connected to SRI-N-D04-DSW01 port Gi1/0/1 ** (1.3.6.1.2.1.2.2.1.10.10,1.3.6.1.2.1.2.2.1.16.10): in=2942128475  out=3802952711
Test 11:GigabitEthernet0/1/1 (1.3.6.1.2.1.2.2.1.10.11,1.3.6.1.2.1.2.2.1.16.11): in=0  out=0
Test 12:GigabitEthernet0/1/2 (1.3.6.1.2.1.2.2.1.10.12,1.3.6.1.2.1.2.2.1.16.12): in=0  out=0
Test 13:GigabitEthernet0/1/3 (1.3.6.1.2.1.2.2.1.10.13,1.3.6.1.2.1.2.2.1.16.13): in=0  out=0
Test 14:Null0 (1.3.6.1.2.1.2.2.1.10.14,1.3.6.1.2.1.2.2.1.16.14): in=0  out=0
Test 15:Vlan1 (1.3.6.1.2.1.2.2.1.10.15,1.3.6.1.2.1.2.2.1.16.15): in=0  out=636482
Test 18:NVI0 (1.3.6.1.2.1.2.2.1.10.18,1.3.6.1.2.1.2.2.1.16.18): in=0  out=0
Test 19:** Vodafone Internet LAN ** (1.3.6.1.2.1.2.2.1.10.19,1.3.6.1.2.1.2.2.1.16.19): in=459245766  out=3026793416
Test 20:** TCL Internet LAN ** (1.3.6.1.2.1.2.2.1.10.20,1.3.6.1.2.1.2.2.1.16.20): in=2709687279  out=2274939694
Test 21:** TCL Internet LAN (Free) ** (1.3.6.1.2.1.2.2.1.10.21,1.3.6.1.2.1.2.2.1.16.21): in=73959951  out=52202989

Created on Feb 3, 2015 11:34:46 AM by  rohit88sood (0) 1

Last change on Feb 3, 2015 2:05:55 PM by  Greg Campion [Paessler Support]



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Ok, can you please run a Custom OID scan with SNMP tester for the OID 1.3.6.1.2.1.2.2.1.16.2 until you see one of the spikes again and then check the values from the router and see if they are also spiking? If so, you will have to investigate why the Cisco is sending out false information.

Created on Feb 3, 2015 2:09:04 PM by  Greg Campion [Paessler Support]



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