hhmmmm.... I wonder which resource the authors of the Cisco Press book were
using when the wrote that.
When reading your post, I also pondered some of the contributing factors
that I thought might determine answers such as you quote. I then went to the
CCO design guide
http://www.cisco.com/univercd/cc/td/doc/cisintwk/idg4/nd2003.htm#16749
watch the wrap
and read what this document had to say. the DG and I agree on several of the
factors - CPU, router memory, number and types of interfaces, number of
routes, stability of the underlying transport. obviously YMMV, as the
numbers below indicate.
BTW, the aforementioned link also states that an OSPF area should have no
more than 50 routers and no OSPF router should have more than 60 neighbors.
Nor should a router be in more than three areas, according to this document.
I presume these rules of thumb were developed by Cisco engineers while
working with major client installations. I know that Cisco actually does
performance testing, and quite often the numbers we see in certification
materials originated during the course of Cisco internal testing as well as
field experience with clients.
Chuck
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Gareth Hinton
Sent: Sunday, July 08, 2001 1:56 PM
To: [EMAIL PROTECTED]
Subject: Re: CID-How many routers in an area [7:11240]
Excerpt from the Cisco Press BSCN book Page 177:
OSPF Design Guidelines - Studies and real world implementations have led to
the following OSPF design guidelines, as documented in OSPF Network Design
Solutions:
(Figures show Minimum, Mean, Maximum)
Routers in a Domain - 20, 510, 1000
Routers per single area - 20, 160, 350
Areas per domain - 1, 23, 60
Just to throw the cat among the pigeons.
Regards,
Gaz
""Stephen Skinner"" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> guys,
>
> i am about to sit the CID (AGAIN) and have a question
>
> how many routers are allowed in an ospf area (max)
>
> i have seen 100 on the boson tests ....42 in some cisco docs and 50 on the
> CCo "designing ospf networks2....
>
> any idea which one the test wants....
>
>
> cheers
>
> steve
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