enter image description here

In the topology shown above each circle represent an area. Now I want to configure multi area OSPF on each router. So for the first router can I do like this:

router ospf 109
network area 1
network area 0
network area 0
network area 0
network area 0

Is this correct method?

  • 1
    Just a comment to it - a router is called an ABR only when it has its interfaces in more than one area and out of those one area should be Area 0. – user5337995 May 18 '19 at 5:11

I can't tell which router you're configuring, but generally speaking, you're correct.

Your diagram is slightly misleading, because it shows routers belonging to a particular area. The important thing to remember is that routers DO NOT belong in an area -- interfaces do. If a router has interfaces in more than one area, then it's an ABR. So the router configuration you've posted makes it an ABR.

  • Sorry, I wanted to keep the routers out of the circle but forgot somehow. So if I exclude the routers from the center, then my method is correct, right? – Ahmad Qayyum May 17 '19 at 14:30
  • 2
    Just make the center circle slightly smaller so that the one interface on all the routers is outside the circle, and the rest are inside. – Ron Trunk May 17 '19 at 14:55
  • why will I leave those interfaces out from the circle and will I consider them when configuring the routers for OSPF? – Ahmad Qayyum May 19 '19 at 20:15
  • The interfaces inside the circle are in area 0. The others are in other areas. – Ron Trunk May 19 '19 at 21:05
  • I have posted a question regarding this matter, can you check it? – Ahmad Qayyum May 19 '19 at 22:04

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