Mmmmm,
The book they quoted "OSPF Network Design Solutions" is coming up for three
years old. I've not got it, so I don't know whether there has been some
mistake while pinching the info, or whether it is quoted correctly. Maybe
that was the view at that time. If it carries on at that rate it'll be one
router per area before long (no neighbours, real fast convergence, very
small routing tables, no comms :-))
Anybody got the book to have a scan through for justification of those
figures, or live next door to Thomas Thomas the 2nd (The author). Go wake
him up and ask him what he was on about.
Gaz
""Chuck Larrieu"" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> 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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