Thanks Marko, am i inferring correctly here? 1. when we use sub second hellos, as there is no way to specify directly in value less than one second (non-integer vlaue in seconds) because RFC states values in seconds.
2. the same 'sub second hellos' are not a prerequisite for adjacency- as a long as the dead interval is minimal. one more thing here, do the advertisement of hello interval as 0 sec has some concept here, or its just because, it cant be equal or more than dead, and the integer less than the minimal is one, Thanks. On Mon, Jun 20, 2011 at 8:05 PM, Marko Milivojevic <[email protected]>wrote: > 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/ > -- thanks gaurav http://routing0sand1s.blogspot.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
