I was setting up my routers the other day, which are running ospf, I did an access list that denied any icmp trafic from its neighbour router, This causeed ospf to drop this rouyter is that correct ? does it use icmp for its hello ?
Did you specify an explicit "permit ip any any" at the end of the ACL? Remember that there is always an implicit "deny ip any any" at the end of any ACL. That is probably why your ospf adjacency went down.
Hope this helps,
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