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I have set up an OSPF network and I cannot ping from the Edge router to Main Branch. enter image description here

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    Never use an image for text. Just copy the text and paste it into the post using the question using the Preformatted-text option ([]). Please edit your question to correct it.
    – Ron Maupin ♦
    Commented Mar 15, 2021 at 1:27
  • Did any answer help you? if so, you should accept the answer so that the question does not keep popping up forever, looking for an answer. Alternatively, you could post and accept your own answer.
    – Ron Maupin ♦
    Commented Dec 23, 2021 at 16:59

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You have some problems:

The two addresses, 10.1.2.6/30 and 10.1.2.2/30 are in two different networks, but they need to be in the same network for direct router connection (see this two-part answer for the specifics).

Next, never use the ip default-gateway command on a router the has routing enabled (see this answer for the details).

Also, the Edge router will not form a neighbor on a passive interface.

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    If it solved your problem, then you should accept the answer so that the question does not keep popping up forever, looking fo an answer.
    – Ron Maupin ♦
    Commented Mar 15, 2021 at 2:32

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