OSPF has so many types as a way to increase the flexibility of the protocol. The major purpose is to match the behavior of the protocol to particular environments. In general each of the types is designed to increase the scalability of the protocol by reducing some amount of detail that the protocol must track and use in its calculations. In single area OSPF the router has the greatest amount of detail and the calculation of the SPF must process all of that detail. As you go through multi-area OSPF, stub OSPF, totally stub OSPF, NSSA OSPF there are various amounts of detail that the router does not maintain and so it reduces overhead and is therefore more scalable.
One way to look at this is that there is a trade-off between the amount of detail that you know (and therefore the better decision that you can make) and the amount of overhead that is required to process all that detail. In each of the OSPF types we give up some kind of detail and gain more scalability.
Question We run asr9001 with XR 6.1.3, and we have a very long delay to
login w/ SSH 1 or 2 to the device compare to IOS device. After
investigation, the there is 1s delay between the client KEXDH_INIT and
the server (XR) KEXDH_REPLY. After debug ssh serv...
Introduction The purpose of this document is to demonstrate the Open
Shortest Path First (OSPF) behavior when the V-bit (Virtual-link bit) is
present in a non-backbone area. The V-bit is signaled in Type-1 LSA only
if the router is the endpoint of one or ...
Hi, I am seeing quite a few issues with patch install and wanted to
share my experience and workaround to this. Login to admin via CLI, then
access root with the “shell” command Issue “df –h” and you’ll probably
see the following directory full or nearly ...