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Controlling Designated Router Election

At designated router election, the router priorities are evaluated first, and the router with the highest priority (between 0 and 255) is elected designated router (DR).

By default, routers have a priority of 128. A priority of 0 marks the router as ineligible to become the designated router. To configure a router so it is always the designated router, set its priority to 255. When you add a new router with the highest priority (255), it becomes the backup designated router of the network unless reelection happens. If two routers have same priorities, the router with the lower router ID is elected as designated router.

To change the priority of a Services Router to control designated router election:

  1. Navigate to the top of the configuration hierarchy in either the J-Web or the CLI configuration editor.
  2. Perform the configuration tasks described in Table 134.

Table 134: Controlling Designated Router Election

Task

J-Web Configuration Editor

CLI Configuration Editor

Navigate to the OSPF interface address for the Services Router. For example, navigate to the ge-/0/0/1 level in the configuration hierarchy.
  1. In the J-Web interface, select Configuration>View and Edit>Edit Configuration.
  2. Next to Protocols, click Edit.
  3. Next to Ospf, click Edit.
  4. Under Area id, click 0.0.0.3.
  5. Under Interface name, click ge-0/0/1.

From the [edit] hierarchy level, enter

edit protocols ospf area 0.0.0.3 interface ge-0/0/1

Set the Services Router priority to a value between 0 and 255—for example, 200. The default value is 128.
  1. In the Priority box, type 200.
  2. Click OK.

Set the priority value:

set priority 200

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