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Ospf Multi Area

I have four routers one will be the hub routers and the other three will be spoke routers that connect back to the hub.  What i want to know is how do i properly configure multiarea ospf with this setup.  Please use detailed examples as far as which interfaces should be in which area.
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NolanDorsett
Asked:
NolanDorsett
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2 Solutions
 
Don JohnstonInstructorCommented:
Is that all the routers you have?

Do you want each router to be the ABR for a different area?
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tvman_odCommented:
It doesn't make sense. You will be perfectly fine with all the routers in area 0.
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NolanDorsettAuthor Commented:
Ok i might just use area zero and lets say i do want each router to be the ABR for each area how would i configure that
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Don JohnstonInstructorCommented:
Assuming you want fa0/0 in area 0 and fa0/1 in area 1:

int fa0/0
 ip address 192.168.1.1 255.255.255.0

int f0/1
 ip address 172.16.1.1 255.255.255.0

router ospf 1
 network 192.168.1.1 0.0.0.0 area 0
 network 172.16.1.1 0.0.0.0 area 1
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NolanDorsettAuthor Commented:
So once i setup each router like this will it be better than having all routers in area zero still even though we dont have separate ABR'  s i assume.  And also will the interfaces in different areas communicate because i tried this and the router didnt advertise the interface that was not in area 0.  But ill try it again this is the complete configuration right this is all i have to do to get  it to work on each router
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NolanDorsettAuthor Commented:
Thnaks both of you have valid points but ill just stick with area 0 since ospf seems very scaleable and it was reccomended not to change to multiarea until i reach about 50 or so routers which is also dependent on the amount of traffic which could vary from company to company but thanks guys for your help.
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tvman_odCommented:
NolanDorsett,
Exactly, I don't introduce multiarea OSPF until network radius (number of routers counting from a core) less then 4 or 5. Besides that this days there is no really low speed links like 19200, so the traffic overhead can be just ignored.
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