Re: OSPF DR/BDR

Carlos,

This is exactly what I mean. If you have two routers or 100 on the LAN segment. You have send the update once not twice with DR.

I think with the existence of the DR, you can easily help other routers to graph the network by generating type-2 Network LSA to provide a good input for the SPT calculations. I mean one type-2 LSA describe all the segment is better than X number of type one LSA to all connection. Do you agree with me Carlos?

--

Mohammad Mousa
CCIE #36990

On Mar 21, 2013, at 7:17 AM, "Carlos G Mendioroz" <tron_at_huapi.ba.ar> wrote:

Your perceived lack of advantage comes from paying only attention to the number of packets sent in the network, and not to the whole cost of mantaining an adjacency.

From your point of view, having 2 routers or having 100 would cost the same ? (1 tx per LSU message).

-Carlos

Mohammad Mousa @ 21/03/2013 03:46 -0300 dixit:
> 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
>
>
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-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net