Alcatel Carrier Internetworking Solutions 060187-10 REV D Enabling and Disabling Summarization

Configuring OSPF Configuring OSPF

Enabling and Disabling Summarization

Summarization can also be enabled or disabled when creating an area. Enabling summarization allows for ranges to be used by Area Border Routers (ABRs) for advertising routes as a single route rather than multiple routes, while disabling summarization prevents set ranges from functioning in stub and NSSA areas. (Configuring ranges is described in “Setting Area Ranges” on page 1-20.)

For example, to enable summarization for Area 1.1.1.1, enter the following:

-> ip ospf area 1.1.1.1 summary enable

To disable summarization for the same area, enter the following:

-> ip ospf area 1.1.1.1 summary disable

Note. By default, an area has summarization enabled. Disabling summarization for an area is useful when ranges need to be deactivated, but not deleted.

Displaying Area Status

You can check the status of the newly created area by using the show command, as demonstrated:

-> show ip ospf area 1.1.1.1

or

-> show ip ospf area

The first example gives specifics about area 1.1.1.1, and the second example shows all areas configured on the router.

To display a stub area’s parameters, use the show ip ospf area stub command as follows:

-> show ip ospf area 1.1.1.1 stub

Deleting an Area

To delete an area, enter the ip ospf area command as shown:

-> no ip ospf area 1.1.1.1

OmniSwitch 6600 Family Advanced Routing Configuration Guide March 2005 page 1-19