Inserting OSPF area aggregate ranges

Use aggregate area ranges to reduce the number of link-state advertisements required within the area. You can also control advertisements.

Before you begin

  • Enable OSPF globally.

  • Ensure that the port uses an IP address.

  • Change the VRF instance as required to configure OSPF on a specific VRF instance. The VRF must have an RP trigger of OSPF. Not all parameters are configurable on non-default VRFs.

Procedure

  1. In the navigation pane, expand Configuration > IP.
  2. Click OSPF.
  3. Click the Area Aggregate tab.
  4. Click Insert.
  5. Type the area ID.
  6. Select the type of link-state database.
  7. Type the IP address of the network.
  8. Type the subnet mask.
  9. Select the effect.
  10. In the AdvertiseMetric box, type a cost to advertise for the OSPF area range.
  11. Click Insert.

Area Aggregate Field Descriptions

Use the data in the following table to use the Area Aggregate tab.

Name

Description

AreaID

Specifies the area in which the address exists.

LsdbType

Specifies the LSDB type:

  • summaryLink—aggregated summary link

  • nssaExternalLink—not so stubby area link

IP Address

Specifies the IP address of the network or subnetwork indicated by the range.

Mask

Specifies the network mask for the area range.

Effect

Specifies advertisement methods:

  • advertiseMatching means advertise the aggregate summary LSA with the same LSID.

  • doNotAdvertiseMatching means suppress all networks that fall within the entire range.

  • advertiseDoNotAggregate means advertise individual networks.

AdvertiseMetric

Changes the advertised metric cost for the OSPF area range.

ExtRouteTag

 Specifies the external route tag to be included in NSSA (type-7) LSAs.
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