3com 5500-ei pwr Instrução De Instalação

 

4-19 

z 

Configuring ASBR route summarization for imported routes. 

Follow these steps to configure ABR route summarization: 

Enter system view 

— 

Enter OSPF view 

ospf [ process-id [ router-id 
router-id ] ] 

— 

Enter area view 

area area-id 

— 

Enable ABR route 
summarization 

abr-summary ip-address mask 
[ advertise | not-advertise ]  

Required 

This command takes effect only 
when it is configured on an 
ABR. By default, this function is 
disabled on an ABR. 

 

Follow these steps to configure ASBR route summarization: 

Enter system view 

— 

Enter OSPF view 

ospf [ process-id [ router-id 
router-id ] ] 

— 

Enable ASBR route 
summarization 

asbr-summary ip-address mask 
[ not-advertise | tag value ] 

Required 

By default, summarization of 
imported routes is disabled. 

 

Follow these steps to configure OSPF to filter received routes: 

To do... 

Enter system view 

— 

Enter OSPF view 

ospf [ process-id [ router-id 
router-id ] ] 

— 

Configure to filter the 
received routes 

filter-policy { acl-number | ip-prefix 
ip-prefix-name | gateway 
ip-prefix-name } import 

Required 

By default, OSPF does not filter 
received routing information. 

 

OSPF is a dynamic routing protocol based on link state, with routing information hidden in LSAs. 

Therefore, OSPF cannot filter any advertised or received LSA. In fact, the filter-policy import 

command filters the routes calculated by SPF algorithm (namely, routes in the OSPF routing table); only 

the routes passing the filter can be added to the routing table.