PRTG monitors PPS on Cisco routers using SNMP

In this post i will explain how to monitors PPS (Packet Per-Second) on Cisco routers using SNMP on PRTG Network Monitor.

First login into the router and get the interface index table:

RTR#show snmp mib ifmib ifindex FastEthernet1/1: Ifindex = 2 GigabitEthernet0/3: Ifindex = 6 GigabitEthernet0/1: Ifindex = 3 VoIP-Null0: Ifindex = 7 Loopback0: Ifindex = 10 Null0: Ifindex = 9 FastEthernet1/0: Ifindex = 1 GigabitEthernet0/2: Ifindex = 5 Tunnel1: Ifindex = 11 NVI0: Ifindex = 12 FastEthernet0/2: Ifindex = 4 SSLVPN-VIF0: Ifindex = 8 RTR#

Then open the PRTG console and add new sensor to the device, search SNMP Custom and choose SNMP Custom (not SNMP Custom String!)

Type a name for the sensor – something like interface name with packet direction (for example: Gi0/1 PPS in)

Enter the correct OID:

Use:

1.3.6.1.4.1.9.2.2.1.1.9 for output packets

1.3.6.1.4.1.9.2.2.1.1.7 for input packets

Don’t forget to add the interface index number after the OID, for example if I would like to monitor GigabitEthernet0/3 input packet per-second the correct OID will be: 1.3.6.1.4.1.9.2.2.1.1.7.6

also add "/s" on the unit string to show that this unit is per-second.

click Continue and that's it.