Create Flow Source

To create a flow source use the following fields:

1. In Source IP Address, type the IP address of the device you want to make a Flow Monitor source.
2. In Display Name, type the name you want to use to identify the flow source.
3. Select Enable data collection from this source.
4. Set SNMP options. Flow Monitor uses SNMP to query information about the interfaces on the source.
   1. Select the appropriate SNMP credentials. If the credentials you want to use are not included in the list, click the browse button (...) to open the Credentials Library. For more information on configuring credentials, see Using Credentials .
   2. To set advanced options, such as timeout and number of retries, click Advanced. The Advanced dialog appears. Set the appropriate values, then click OK to return to the Flow Sources dialog.
   3. Select Query to query the router using SNMP to get updated names and speeds for the available interfaces.
5. Select the data you wish to gather using SNMP polling.
   • To collect total interface data, select Poll source for total interface traffic.
   • To collect NBAR information, select Poll source for NBAR information.
   • To collect CBQoS information, select Poll source for CBQoS information.
6. Configure the speed of each interface, which is used to calculate capacity as a percentage of the total interface speed.
   1. Select an interface, then click Edit. The Flow Interface dialog appears.
   2. Select Hide this interface from the Flow Monitor Home page and related configuration properties to hide the selected interface from the Flow Monitor Home page and other menu options in Flow Monitor. This lets you display only the interfaces that are relevant to your bandwidth monitoring requirements.

   Note: Null(0) interface names are hidden by default because they are not a true source interface. Null(0) interfaces show traffic that a router has dropped, or traffic that a router has generated. In both cases, the ifIndex = 0 and as a default convention we name an interface = Null because the interface is none existent. If you want Null(0) interface information to display as a source interface, make sure that you uncheck the Hide this interface from the Flow Monitor Home page and related configuration properties option.

   1. Select Specify a custom speed for this interface. The In and Out fields are enabled.
   2. In In and Out, enter the upper limit of the interface in bps (bits per second). Common interface speeds expressed in bps are:
      • 1 Gbps = 1,000,000,000 bps
      • 100 Mbps = 100,000,000 bps
      • 10 Mbps = 10,000,000 bps