Hi There,
I had a rather hard time with our Cisco 2900 Series Router (1 4G Cellular and 2 Giga EHWICS) and our Cisco 1900 Series Router (single Port) and the Netflow and SNMP sensors... in the end it was all down to the right configuration on the cisco... therefore find my solution here:
Some Cisco Commands for PRTG Sensors
Enable Netflow for specific Interface
interface FastEthernet 0/1 (general command: interface [interface name] [interface number])
ip route-cache flow
Configure Netflow
ip flow-export version 5 (or version 9)
ip flow-cache timeout active 5
ip flow-cache timeout inactive 10
ip flow-export destination [ip] [port] (port 9991, can be up to 10 different IPs)
Disable Netflow for specific IP and Port
no ip flow-export destination [ip] [port]
Disable Netflow for specific Interface
interface [interface name] [interface number]
no ip route-cache flow
exit
Configure SNMP
SNMP-Server view [ViewName] internet included
> in case return %Bad OID internet does not work, use ISO or 1.3.6 instead
> included means MIB family is included
SNMP-Server group [GroupName] v3 priv read [ViewName] write [ViewName]
> v3 could be v2c or v1
> priv means using authPriv Security Model, could be auth for authNoPriv and authNoPriv for no AuthNoPriv
> read/write could be access, context, notify
SNMP-Server user [UserName] [GroupName] v3 auth MD5 [Password] priv DES [Password]
> MD5 could be SHA
> DES means using Data Encryption
Copy running config as persistent config
copy running-config startup-config
PRTG SNMP Setting
Make this settings on Local Probe Level to make it available for all devices!
SNMP Version: v3
Authentication Type: MD5
User: [UserName]
Password: [Password]
Encryption Type: DES
Data Encryption Key: [Password]
Context Name: leave empty
SNMP Port: 161 (Firewall Settings UDP!)
SNMP Timeout: 5
PRTG NetFlowV5 Sensor
Receive NetFlow Packets on UDP Port: 9991
Sender IP: leave empty or specify Ciscos IP
Receive Packets on IP: IP of PRTG Server
Actie Flow Timeout 5
Rest up to what you want....
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