Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Router OSPF

When configuring OSPF on the CCNA Exam, which reverse mask is required? There is much documentation supporting the specific reverse subnet mask, and the standard classful reverse mask.

1 REPLY

Re: Router OSPF

Hi,

With the network command you only control which interface should OSPF run on (the interface(s) which its IP(s) are covered by the network command), and has nothing to do with the subnet mask of the routes advertised (the routes advertised inherit the subnet mask from the interfaces), and thus its your call how to control the wildcard mask of the network command to control which interface(s) should run OSPF, personally i prefer running the network command with a wildcard of 0.0.0.0 to indicate certain specific interfaces and to be clear in the configuration, and you can also summarize multiple interfaces with one network command, it all depends on your scenario, and as for the exam you can freely either use the 0.0.0.0 wildcard, or just inverse the subnet mask which i saw many people/books do, but i just don't like it as i can't feel its benefit.

HTH,

Mohammed Mahmoud.

233
Views
0
Helpful
1
Replies
CreatePlease login to create content