>Hello. I was wondering (after reading ospf) if 1 network = 1 area, or if
>you can have several networks inside of one area?
OSPF has no restrictions on the number of prefixes per area, until
you get into performance limitations. What may be confusing you is
that some OSPF documentation uses classful addressing, and, in the
examples, often assigns one /16 (i.e., a class B) per area. OSPF is
a classless protocol and is quite unaware of "networks."
In fact, you could perfectly well have:
area 0.0.0.1 containing 172.16.0.0/15
172.20.0.0/16
172.19.1.0/24
area 0.0.0.2 containing 192.168.1.0/24
172.20.1.0/24
172.19.0.0/16 (i.e., except for the "hole" in area 1)
>And on page 177 in Ciscopress BSCN, it says the following guidelines: # of
>routers in a domain/single area= minimum of 20. That is hard to understand.
That makes no sense. You can have an area with one router, you can
have a router that connects several areas (as long as one of them is
0.0.0.0), and you can have an area with a couple of hundred routers.
>Cant we have one domain with one router? Like, if we have a LAN here, with
>access to the internet, isnt that one domain with one router?
>Thanks!
How are you defining "domain"?
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