The OSPF Command for a Totally Stubby Area

The syntax for the OSPF command for a totally stubby area is as follows:

area area-id stub no-summary

This addition of the no-summary parameter informs the ABR not to send summary updates from other areas into the area. This command needs to be configured only on the ABR because it is the only router with this responsibility. This command is configurable only on a Cisco router because it is a proprietary command. All the other routers are configured as stub-area internal routers.

Figure 6-10 illustrates the example configuration of a totally stubby area that follows.

Figure 6-10 The Configuration of a Totally Stubby Area

Figure 6-10 The Configuration of a Totally Stubby Area

Example 6-5 shows the configuration of a totally stubby area.

Example 6-5 The Configuration of a Totally Stubby Area

Router Phoebe ospf 100

network 172.16.20.144 0.0.0.7 area 0 network 172.16.20.16 0.0.0.7 area 2 area 2 stub no-summary area 0 range 172.16.20.128 255.255.255.192 Router Martin router ospf 100

network 0.0.0.0 255.255.255.255 area 2 area 2 stub

As a totally stubby area, no summary or external routes are propagated by the ABR into the area. To reach networks and hosts outside their area, a workstation must send to a default route, which the ABR advertises into the area.

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