This post covers in detail some complex scenarios where OSPF is implemented for routing and the OSPF LSAs that come into play in each of them.
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OSPF Forward Address – Database Overview
This post covers in detail the OSPF LSA Types, their scope and functionality. You should read this publication to understand how OSPF works because it can get very complex.
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Dynamic Multipoint VPN (DMVPN) and IGP Routing Protocols
Dynamic Multipoint VPN (DMVPN) is a multipoint GRE-based tunnelling technology. DMVPN consists of one or more hub routers that are configured as Next-Hop Resolution Protocol (NHRP) Next-Hop Servers (NHS). NHS, or hubs, are used to create mappings between the public IP address used for the tunnel source (NBMA address), and the private IP address used inside of the tunnel (tunnel address).
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