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Apply, Modify, or Add BGP Polices

Applying Policies

  1. BGP policies that have already been defined at a router can be applied as an in policy or as an out policy. To bring up the Modify BGP Neighbors window, first switch to the Modify action mode. Then select the Modify > Protocols > BGP > BGP Neighbors ... function to bring up the BGP Neighbors window, from which a row can be selected. Double-click on a selected row or click on the Modify button to bring up the Modify BGP Neighbors window as shown in the following figure.
    Figure 1: Modify BGP NeighborsGUI for configuring BGP neighbor with fields for AS numbers 65100 and 65200, node TPE3640, Ethernet2/0, status up, IP 10.2.38.2, and options for routing policies.
  2. Select either the In Policy tab or the Out Policy tab to see the Available Policies at that node and the Applied Policies lists. Selected policies in the Available Policies list can be moved to the Applied Policies list by clicking on the Add-> button and, vice versa, selected policies in the Applied Policies list can be moved to the Available Policies list by clicking on the <-Remove button. The following figure shows an example of a BGP policy (setlocalpref) that has been moved to the router’s Applied Policies list.
    Figure 2: Applying an In PolicyGUI for configuring BGP neighbor policies with tabs, policy lists, and action buttons for managing routing policies in a network management system.

In some cases, abbreviations are used to describe the policies, in the format Match Type: Match Name, where the Match types are interpreted as follows:

  • AC–Access List

  • AL–AS-path access list

  • CL–Community List

  • CL–Community List

  • PL–Prefix List

Modify BGP Policy

  1. To modify a BGP policy at the router, click on the Policy Editor... button to bring up the Routing Policy Editor window as shown in the following figure. Then select a particular policy from the left pane to display corresponding policy commands in the right pane.

  2. The + button expands a selection, while the - button collapses it. Dropdown menus and text fields allow you to modify the policy. The following figure shows an example of a BGP policy that is used to set the local-preference to a value of 80.

    Figure 3: Modifying a BGP PolicyRouting Policy Editor GUI for RTA with selected policy setlocalpref, local preference set to 80, add button, OK, Cancel, Help options.

  3. To see the generated configlet for the BGP policy, click on the Configlet tab. The following figure shows the generated configlet corresponding to a BGP policy (setlocalpref).

    Figure 4: The Generated Configlet for a BGP PolicyGraphical user interface for Routing Policy Editor RTA with list of routing policies. Setlocalpref policy selected with actions setting local preference to 80 and accepting route. Tabs for Object and Configlet, and buttons for Add, OK, Cancel, and Help.

  4. The right-click menu or the Actions menu offers further options for modifying the routing policy. To add a new term to a policy, first select the policy. Then from the right pane, select New from either the Action menu or the right-click menu. Note in the following figure that after selecting New, a new item was added to the policy.

    Figure 5: Adding a term to a policyRouting Policy Editor tool GUI labeled RTA for configuring policies like access lists, prefix lists, and route maps.

  5. For route map policies, you can add commands underneath a particular term. Highlight the term, right-click, and select New... to open up the following dialog. Add “match” or “set” commands as shown in the following figure. Note that to deselect an item, simply click on a white space in the right pane.

    Figure 6: Adding a match command to a term of a route-mapRouting Policy Editor GUI with left panel showing policies like community-list 1 and route-map 1401in. Right panel details route-map 1401in rules permit 10 and deny 30. New Policy dialog open with dropdown for policy type and text field for match condition. OK and Cancel buttons present.

Adding a BGP Policy

To add a new BGP policy, click on the Add... button in the lower left hand corner of the window to bring up the New Policy window (shown in the following figure), and proceed the same way as is done in modifying a BGP policy. Here you have a choice of five different types of policies: route-map, access-list, as-path access-list, community-list, and prefix-list. Note that the options may vary depending on the policy type.

Figure 7: New Policy WindowDialog box titled New Policy for creating a new policy with dropdown to select policy type, text field for policy name, and OK and Cancel buttons.