OSPF Backbone area 0 decision

Dear all,

I created Area 0 in ZoneA, and in this zone i have other area (1,2,3 ...) . some of this sub area is nbma and some is point to point connection.

I have another ZoneB, and it also have connection to other location over point to point link. From ZoneA link to ZoneB through E1 link (point to point) thus should I assign ABR of ZoneB and its internal router in Area 0 too?
Because i don't want to create virtual ink in ZoneB to other sub area.

Your advise please!
ikhmerAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

ikhmerAuthor Commented:
Note:
+ ZoneA is a big CityA and in this city there is 3 remote network(office)
+ ZoneB is another big CityB, and it also have 3 or 4 remote offices

                            (Area3)                                            (Area6)
                                  |                                                      |  
           (Area1)----(ZoneA Area 0)============(ZoneB area? )--(Area7)---(Area8)
                                  |                        
                             (Area2)
                           



0
Don JohnstonInstructorCommented:
First off, this "zone" reference is a bit confusing.

The only thing I would do different is to move Area 8 so that it is adjacent to Area 0. Otherwise, you'll have to create a transit link though Area 7.
0
ikhmerAuthor Commented:
For Area8, i will create virtual link .
and if ZoneB(cityB) is not assigned as area0 then i need to create virtual link for area 7 also.

My question is should I assign ZoneB network as Area 0 too? thus ZoneA and ZoneB will be in the same area 0
and there will be two DR of Area 0 because link between ZoneA to ZoneB is point-to-point. thus i'm afraid their is problem in SPF calculation.
0
Ultimate Tool Kit for Technology Solution Provider

Broken down into practical pointers and step-by-step instructions, the IT Service Excellence Tool Kit delivers expert advice for technology solution providers. Get your free copy now.

602650528Commented:
Well i don't see any problem in SPF calculation if you configure Zone B to be in Area 0; DR is chosen per link and not per area so you can have as many DRs in any area as per ethernet subnet in an area.

So configure Zone B to be in area 0 and virtual link between area 8 and zone B.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Don JohnstonInstructorCommented:
>My question is should I assign ZoneB network as Area 0 too?

Yes. Otherwise you'll be dealing with two virtual links and one will be crossing two areas.
0
ikhmerAuthor Commented:
Thank all for your advise, now i can continue my plan by adding CityB into Area0 .
By the way, in the broadcast network their should be only one DR, one BDR and multiple DROther  thus in my case
I will have two DR , one in CityA internal network and other one in CityB internal network of Area 0

0
602650528Commented:
Once again, you can have a DR on a broadcast link, the link between city A and city B is point-to-point and so do not need a DR. You don't necessarily have just one DR in an area. DR is dependent on broadcast link and you can have as many DRs as the number of broadcast link in anhy particiular area. So this design is fine as it is.
0
Don JohnstonInstructorCommented:
Without knowing the physical topology, it's hard to say how many DR's you'll have. But you are correct that every broadcast network will have a DR and BDR. It's also possible for one router to be the DR on multiple networks.
0
Nayyar HH (CCIE RS)Network ArchitectCommented:

Just something to bear in mind...

Are Zone A and B one big Autonomous System and adminstartive control? If so, the above solution is best way and keeping it simple.

0
ikhmerAuthor Commented:
thank all
0
ikhmerAuthor Commented:
Thank you, good explaination
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Routers

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.