Re: [WISPA] OSPF maximums

2009-10-29 Thread Nick Olsen
If I understand correctly, There is no limit. But I vaguely remember 
something about OSPF being unstable with 500+ routers. As you start to get 
to much crosstalk overhead.
If its a big area you would need to do like OSPF and BGP I don't remember 
how it went, something like transit routes with ospf and advertise the 
customer space with bgp...

Nick Olsen
Brevard Wireless
(321) 205-1100 x106




From: Jory Privett j...@wccs.net
Sent: Thursday, October 29, 2009 11:33 AM
To: wireless@wispa.org wireless@wispa.org
Subject: [WISPA] OSPF maximums

For all of you routing gurus out there,   On MikroTiks version,  or any 
other brand,  of OSPF what is the maximum number of routes or routers in a 
single OSPF Area?  Is this only limitied by CPU/Memory or is there 
something else that dictates it?

Jory



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Re: [WISPA] OSPF maximums

2009-10-29 Thread Kevin Neal
I'm pretty sure the limit is just CPU/Memory.  We currently 112
routing entries in one of our networks, this is on a network with 24
OSPF routers.

-Kevin


On Thu, Oct 29, 2009 at 9:33 AM, Jory Privett j...@wccs.net wrote:
 For all of you routing gurus out there,   On MikroTiks version,  or any other 
 brand,  of OSPF what is the maximum number of routes or routers in a single 
 OSPF Area?  Is this only limitied by CPU/Memory or is there something else 
 that dictates it?


 Jory


 
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Re: [WISPA] OSPF maximums

2009-10-29 Thread Dennis Burgess
I think a good OSPF single area would be around 75 routers.  Over that
you get quite a bit of traffic.  Not saying that this is a hard limit,
just a rule of thumb.  

---
Dennis Burgess, CCNA, A+, Mikrotik Certified Trainer
WISPA Board Member - wispa.org
Link Technologies, Inc -- Mikrotik  WISP Support Services
WISPA Vendor Member
Office: 314-735-0270 Website: http://www.linktechs.net
LIVE On-Line Mikrotik Training
Author of Learn RouterOS


-Original Message-
From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On
Behalf Of Jory Privett
Sent: Thursday, October 29, 2009 10:33 AM
To: wireless@wispa.org
Subject: [WISPA] OSPF maximums

For all of you routing gurus out there,   On MikroTiks version,  or any
other brand,  of OSPF what is the maximum number of routes or routers in
a single OSPF Area?  Is this only limitied by CPU/Memory or is there
something else that dictates it?


Jory




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Re: [WISPA] OSPF maximums

2009-10-29 Thread Matt Larsen - Lists
Using StarOS we have about 480 subnet routes propagating throughout our 
network.   This represents approximately 220 routed devices.

Matt Larsen
vistabeam.com

Dennis Burgess wrote:
 I think a good OSPF single area would be around 75 routers.  Over that
 you get quite a bit of traffic.  Not saying that this is a hard limit,
 just a rule of thumb.  

 ---
 Dennis Burgess, CCNA, A+, Mikrotik Certified Trainer
 WISPA Board Member - wispa.org
 Link Technologies, Inc -- Mikrotik  WISP Support Services
 WISPA Vendor Member
 Office: 314-735-0270 Website: http://www.linktechs.net
 LIVE On-Line Mikrotik Training
 Author of Learn RouterOS


 -Original Message-
 From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On
 Behalf Of Jory Privett
 Sent: Thursday, October 29, 2009 10:33 AM
 To: wireless@wispa.org
 Subject: [WISPA] OSPF maximums

 For all of you routing gurus out there,   On MikroTiks version,  or any
 other brand,  of OSPF what is the maximum number of routes or routers in
 a single OSPF Area?  Is this only limitied by CPU/Memory or is there
 something else that dictates it?


 Jory


 
 
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Re: [WISPA] OSPF maximums

2009-10-29 Thread Butch Evans
On Thu, 2009-10-29 at 10:33 -0500, Jory Privett wrote: 
 For all of you routing gurus out there,   On MikroTiks version,  
 or any other brand,  of OSPF what is the maximum number of routes 
 or routers in a single OSPF Area?  Is this only limitied by CPU/Memory 
 or is there something else that dictates it?

While there may be an actual maximum number, I cannot find that in the
standard.  In practice, however, I have found that keeping the number of
interfaces in an area under 100 to be helpful.  Realistically, that is a
very large number.  Also, it is important to note the difference between
interfaces and routers in OSPF networks.  An OSPF Router (which
can be viewed in Mikrotik in the GUI) is a device that is participating
in the OSPF network on any interface.  An OSPF interface is what gets
counted as a hop and is, therefore, part of the path cost
calculation.  

So, the short answer is:  Keep the number of interfaces around (or
below) 100 or so.

I have seen SOME people who recommend under 200 ROUTERS per AS.  I have
not run into any sorts of limitations in that regard, but there are only
a few networks that I work on that have enough routers to even reach
that number.  :-)

-- 

* Butch Evans   * Professional Network Consultation*
* http://www.butchevans.com/* Network Engineering  *
* http://www.wispa.org/ * Wired or Wireless Networks   *
* http://blog.butchevans.com/   * ImageStream, Mikrotik and MORE!  *





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Re: [WISPA] OSPF maximums

2009-10-29 Thread Butch Evans
On Thu, 2009-10-29 at 09:44 -0600, Kevin Neal wrote: 
 I'm pretty sure the limit is just CPU/Memory.  We currently 112
 routing entries in one of our networks, this is on a network with 24
 OSPF routers.

Number of routes is not that much of a problem.  I have one customer
with about 8k OSPF routes (he does pppoe).  You can do BGP with nearly
300K routes without problems.  

-- 

* Butch Evans   * Professional Network Consultation*
* http://www.butchevans.com/* Network Engineering  *
* http://www.wispa.org/ * Wired or Wireless Networks   *
* http://blog.butchevans.com/   * ImageStream, Mikrotik and MORE!  *





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Re: [WISPA] OSPF maximums

2009-10-29 Thread Butch Evans
On Thu, 2009-10-29 at 13:06 -0500, Butch Evans wrote: 
 So, the short answer is:  Keep the number of interfaces around (or
 below) 100 or so.

I should add that I DO have customers who have well over 150 ROUTERS
with multiple interfaces in a single area.  This limit is not a hard
limit.  The other reality is that when you reach that number of
routers, it is very likely that a network should be relatively easy to
reconfigure into multiple areas.

-- 

* Butch Evans   * Professional Network Consultation*
* http://www.butchevans.com/* Network Engineering  *
* http://www.wispa.org/ * Wired or Wireless Networks   *
* http://blog.butchevans.com/   * ImageStream, Mikrotik and MORE!  *





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