Cisco Systems OL-8241-02 Manual De Usuario

To propagate summary LSAs in the stub area, include the send-summaries 
option. For example: 

(config)# ospf area 0.0.0.1 stub send-summaries

To remove an OSPF area, disable OSPF, then use the no form of the ospf area 
command. For example:

(config)# no ospf enable

(config)# no ospf area 0.0.0.1

By default, the OSPF CSS is configured to use 15 equal-cost routes. Use the ospf 
equal-cost command to change the number of routes. Enter a number from 1 
to 15. 

To configure 10 equal-cost routes for use by the CSS, enter:

(config)# ospf equal-cost 10

To reset the equal-cost routes to its default value of 15, enter:

(config)# no ospf equal-cost

If the CSS is an ABR, you can configure it to advertise a single summary route or 
network ranges that cover all the individual networks within the specified range. 
This summarization helps control routing table sizes and prevents the constant 
changing of routes whenever an interface within an area comes online or goes 
offline. These route changes do not cause route changes in backbone ABRs and 
other area routers.

Use the ospf range command to specify the IP address range to summarize routes 
at the ABR. This summarization applies to inter-area paths that are paths to 
destinations in other OSPF areas. You can also determine whether you want to 
advertise this range. Disable OSPF before you enter the ospf range command.