Answers are inline. On Sun, Jun 19, 2011 at 22:28, gaurav nunia <[email protected]> wrote: > First changing OSPF hello interval changes the dead interval automatically, > but changing the dead interval don't change the hello- is there a reason > behind this?
Yes - by default dead-timer is defined as "4 times the value of hello-timer". Therefore, changing hello timer implicitly changes the dead-time. Now, why Cisco chose not to implement it the other-way round is anyone's guess, but I guess they wanted some flexibility in the configuration... > but when sub second hellos are configured on a router, changing the dead > interval changes the hello to default. > why it happens so ? Because there is no way to specify value less than one and greater than 0, i.e. values carried in hello packets are integers. In the case of fast hellos, the actual hello timer is not as relevant, as it is otherwise, since dead-timer is one second. -- Marko Milivojevic - CCIE #18427 Senior Technical Instructor - IPexpert FREE CCIE training: http://bit.ly/vLecture Mailto: [email protected] Telephone: +1.810.326.1444 Web: http://www.ipexpert.com/ _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com
