This is really the domain of text books on network design and short bursts
of text aren't likely to do the question any justice. As with similar
questions like how many routers in an OSPF area this question yields a
variety of answers depending on the desired functionality and related
composition and topology of the network. Further, other non technical
items including geography and operations support also play a role here.
The decision to add hierarchy to a network is not exclusively driven by the
need to reduce CPU load on routers. I would suggest this to be the
exception, not the rule. For what its worth, I've seen thousands of routers
deployed in multi area OSPF domains and over a thousand routers in single
ISIS areas. I've also seen very small networks that found relevance in BGP
confederations and thus ran multiple IGP domains.
*** REPLY SEPARATOR ***
On 8/14/2001 at 11:56 AM Mark Eidinger wrote:
If asked to select a routing protocol for various venders routers in a
large network, we would answer OSPF, but have concerns about the
resources (CPU memory) of some routers in the network. If asked the
same question, but in a very large network whats the answer? And whats
a very large network as compared to a large network? I realize, if you
start seeing different autonomous systems youre getting there, but
where do we draw the line? If we are designing a network from scratch
when do we say, lets make different autonomous systems? When area 0 gets
to 50 routers?
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7i=16049t=16039
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