Assigning a cost

Setting a summary cost to an area

This example shows how to set the summary cost to 100 for area 10 with an address range of 10.10.0.0/16.

switch(ospf)# area 10 range 10.10.0.0/16 type summary cost 100

Using a standard summary cost for an area

This example shows how to use the standard method for determining the summarized cost.

switch(ospf)# area 10 range 10.10.0.0/16 type summary

You must execute write mem to preserve these settings across reboots.

Setting a summary cost to an NSSA area

To set the summary cost for NSSA area 20 address range 10.20.0.0/16 to 100 with a default metric-type of type2, enter the following command.

switch(ospf)# area 20 range 10.20.0.0/16 type nssa cost 100

Setting a summary cost and metric-type to an NSSA area

To set the summary cost and metric-type for NSSA area 20 address range 10.20.0.0/16 to 100, enter the following command.

switch(ospf)# area 10 range 10.10.0.0/16 type nssa cost 100 metric-type type1

Using the RFC standard ethod to determine the summarized cost to an NSSA area

To change the configuration so that the 10.20.0.0/16 range uses the RFC standard method for determining the summarized cost, enter the following command.

switch(ospf)# area 10 range 10.10.0.0/16 type nssa

You must execute write mem to preserve these settings across reboots.

Output showing settings for summary costs

The show ip ospf command displays information about summary costs. An entry of auto indicates that the cost is calculated by the OSPF standard for summarized networks.

switch(config)# show ip ospf

OSPF Configuration Information
   :
   :
Currently defined address ranges:
 Area ID         LSA Type   IP Network      Network Mask    Advertise Cost
 --------------- ---------- --------------- --------------- --------- --------
 0.0.0.10        Summary    10.10.0.0       255.255.0.0     yes       auto
 0.0.0.20        NSSA       10.20.0.0       255.255.0.0     yes       auto
 0.0.0.30        Summary    10.30.0.0       255.255.0.0     no        16777215