Configuring Maximum Prefixes (NSM Procedure)

You can configure a limit for the number of routes installed in a routing table based upon the number of route prefixes in the table. .

To configure maximum prefixes limit in NSM:

  1. In the navigation tree, select Device Manager > Devices.
  2. In the Devices list, double-click the device to select it.
  3. Click the Configuration tab.
  4. In the configuration tree, expand Routing Options.
  5. Select Maximum Prefixes.
  6. Enter the parameters as specified in Table 37.
  7. Click one:
    • OK—To save the changes.
    • Cancel—To cancel the modifications.
    • Apply—To apply the routing option settings.

Note: After you make changes to a device configuration, you must push that updated device configuration to the physical security device for those changes to take effect. You can update multiple devices at one time. See the Updating Devices section in the Network and Security Manager Administration Guide for more information.

Table 37: Configuring Maximum Prefixes Fields



Your Action


Specifies the comment for the maximum prefix limit.

Enter the comment.


Indicates the maximum number of route prefixes. If this limit is reached, a warning is triggered and additional routes are rejected.

Enter limit value or select from the list.

Log Interval

Indicates the minimum time interval (in seconds) between log messages.

Enter the log interval value or select from the list.


Specifies what is to be done when the routing table reaches the maximum prefix value. The options are:

  • None—No action is to be taken.
  • threshold—You can configure a percentage for the maximum number of prefixes, which when installed, triggers the warning.
  • log-only—Sets the prefix limit as an advisory limit. An advisory limit triggers only a warning, and additional routes are not rejected.
  1. Expand the Maximum Prefixes tree and select Threshold.
  2. Select the option button.