I think we all started with really flat networks, and I think of them
the same way as Chuck; all L2 accessible. One subnet. That really only
works for about 200-250 subscribers, and then you are done.
If you've got 10, 100, or 1000 routes in an OSPF design, you are not
really "flat" except by OSPF standards, you might be in the same area.
There's still a lot of routing going on.
bp
<part15sbs{at}gmail{dot}com>
On 6/7/2018 5:15 PM, Chuck McCown wrote:
To me, flat network means all MACs are in the same broadcast domain.
That is what I did with my first Canopy system.
Did not even know what a VLAN was back then.
*From:* Gino A. Villarini
*Sent:* Thursday, June 07, 2018 5:47 PM
*To:* af@afmug.com
*Subject:* Re: [AFMUG] OSPF - How large can a flat network grow?
Our network by all means is flat as all services converge into our
core.� We started by using vlans and qinq but later migrated to mpls/vpls.
Now watching evpn as the next step..
From: Af <af-boun...@afmug.com> on behalf of Lewis Bergman
<lewis.berg...@gmail.com>
Reply-To: "af@afmug.com" <af@afmug.com>
Date: Thursday, June 7, 2018 at 3:09 PM
To: "af@afmug.com" <af@afmug.com>
Subject: Re: [AFMUG] OSPF - How large can a flat network grow?
Gino would probably be your best source for advice as I'll bet he has
one of the largest networks of similar construction. I think he went
MPLS to deal with a variety of issues he was having, including OSPF.
But maybe Gino can speak up on the issue.
Typically, if you didn't want to do anything else, you would consider
iBGP and break the OSPF domains up in some logical way. The big
determining factor for me for such things is the occurrence route
flapping and how often it happens. Route flapping will be the big
indicator that you are to big and OSPF can't keep up. You can do some
tweaking but at some point it just all falls apart. The bad part about
waiting till that happens is you will loose a lot of customers trying
to make things stable again.
I would think Denis also would have a much better informed path to
take and I'll bet he would be happy to contract to help you. Probably
money well spent.
*//*
*/Gino A. Villarini/*
President
Metro Office Park #18 Suite 304 Guaynabo, Puerto Rico 00968
On Thu, Jun 7, 2018 at 1:40 PM Brough Turner <bro...@netblazr.com> wrote:
We're an urban WISP with a dense mesh of wireless links and a
router per building. I am concerned that, without paying
attention, we have grown to 600+ routers and ~2550 routes in one
OSPF domain. This network has a diverse mix of routers from
CCR1036s down to RB750UPs. We're not having any OSPF problems at
this time and I have plenty of other things to worry about, but
I'd hate to hit some limit and have the whole thing blow up.
Does anyone have experience (positive or negative) with large flat
OSPF networks?
And, if you have had problems, what were the problems?
Thanks,
Brough
Brough Turner
netBlazr Inc. � Free your Broadband!
Mobile: 617-285-0433 <tel:%28617%29%20285-0433> Skype:� brough
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