ZyXEL Communications ES-315-F - V3.70 Podręcznik Użytkownika Pobierz pdf (Strona 172)

GS-4012F/4024 User’s Guide

Chapter 25 OSPF 171

In most cases the default DR/BDR election is fine, but in some situations it must be controlled.

In the following figure only router A has direct connectivity with all the other routers on the

network segment. Routers B and C do not have a direct connection with each other. Therefore

they should not be allowed to become DR or BDR. Only router A should become the DR.

Figure 82 OSPF Router Election Example

You can assign a priority to an interface which determines whether this router will be elected

to be a DR or BDR. The router with the highest priority becomes the DR, while a router with a

priority of 0 does not participate in router elections. In Figure 82 on page 171 you can assign a

priority of 0 to routers B and C, thereby ensuring they do not become DR or BDR and assign a

priority of 1 to router A to make sure that it does become the DR.

25.1.5 Configuring OSPF

To configure OSPF on the switch, do the following tasks

1 Enable OSPF

2 Create OSPF areas

3 Create and associate interface(s) to an area

4 Create virtual links to maintain backbone connectivity.

25.2 OSPF Status

Use this screen to view current OSPF status. Click IP Application, OSPF in the navigation

panel to display the screen as shown next. See Section 25.1 on page 169 for more information

on OSPF.

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ZyXEL Communications ES-315-F - V3.70 Podręcznik Użytkownika Strona 172