Re: OSPF DR/BDR

Another thing to consider is that once you get to exchange state with
a neighbor you are actually exchanging DBD and after that LSA
information.

With 99 neighbors you have to go through all the states from down to
full for each of them and you have all that overhead to go with it.

In DROTHER you only get to two-way which basically just means both
sides have heard hellos and acknowledge the other neighbor but you
don't have the real CPU intensive stuff happening

Sent from my iPad

On Mar 21, 2013, at 4:06 AM, Mohammad Mousa <mohd-mousa_at_hotmail.com> wrote:

> Hello Folks,
>
> Appreciate if someone could clear up this point for me.While I'm reviewing the OSPF, I noticed this issue.
> In the ospf Net-type (broadcast,Non-broadcast). The advantages of using the DR/BDR are:
>
> 1-Minimize the adjacencies.
> 2-Minimize LSA replication.
>
> Suppose we have ethernet LAN segment between four routers R1,R2,R3,R4. R1 is DR, R2 is BDR. I know drothers will stay in the 2-way states. When R3 generate LSU it will go for 224.0.0.6 and then DR will replicate this to all multicast ospf routers 224.0.0.5. My question is suppose we don't have the DR. R3 will generate the LSU to 224.0.0.5 (All routers on that LAN segment). So using DR IS NOT giving me the benefit by reducing the LSA replication on the segment. Am I correct? Any thought will be highly appreciated!
>
> Thanks in advance
> --
> Mohammad
> CCIE #36990
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net
Received on Mon Mar 25 2013 - 01:25:04 ART