Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?


About the Topology Filter Page

To access this page, click Configuration > Network > Topology Filter.

The topology filter service allows you to limit the nodes appearing in your topology map to a subset of the nodes in your network. This capability is important when your network contains more nodes than your license covers and you want to control which nodes are recognized. You might also want to filter out nodes that are not important for traffic engineering management such as aggregation layer nodes or route reflectors.

The topology filter is available only in installations utilizing BMP for the topology acquisition method. The topology filter is added to the BMP messaging pipeline between the BMP monitor and the topology server.

Filtering the topology involves creating a set of rules. Each rule consists of the field (Condition Field) to search on, the value (Condition Value) to look for, the Condition Type to be applied (match or regex) and the Action to be taken if the value is a match. The rules are applied in a sequence. Once a node is matched based on the rule, it cannot be matched by a subsequent rule. The topology filter service checks links and removes links that involve an excluded node, even if the excluded node is reporting information to the traffic engineering database.

Enable the Topology Filter Service

Before using the topology filter in the UI, you must first enable the topology filter service by modifying the configuration file.

You must modify the BMP host and port values in the northstar-config configuration map file using a text editing tool such as vi.

To enable the topology filter service:

  1. Log in to the Paragon Automation master node and execute:

  2. Set the following parameters:

    • (Default is bmp-grpc which is the bmpMonitor end point.)

    • (Default is 10002.)

  3. Save the config-map file and exit.

    All the pods using this config-map are restarted automatically.


    You can check the status of all services by executing:

Tasks You Can Perform

You can perform the following tasks from this page:

  • Add a topology filter rule. See Add a Topology Filter Rule.

  • Edit the existing topology filter rule. See Edit a Topology Filter Rule.

  • Delete an existing topology filter rule. See Delete a Topology Filter Rule.

  • From the More list, you can:

    • View detailed information about the topology filter rule by clicking the details icon that appears when you hover over the filter rule or select More > View Details. A Result of Applied Filters page appears on the right displaying the filter rule details.

    • Export all the topology filter rules to a CSV file by clicking More > Export Rules.

  • Show/Hide Columns: Choose to show or hide a specific column in the Filter Rules table.

    Hover over the More Options (vertical ellipses) > Show/Hide Columns and select the Column-Name check box of the column you want to display in the table.

Field Descriptions

Table 1: Fields on Topology Filter Page



Condition Field

Field (hostname, router-id, or sys-id) selected as the condition while adding a filter rule.

Condition Type

Type of match using text or regex (regular expression).

Condition Value

Text to be matched.


Action to be performed on the condition value (Accept or Reject).