Yeah, nightmare...
From: Eric Kuhnke
Sent: Thursday, June 07, 2018 6:33 PM
To: af@afmug.com
Subject: Re: [AFMUG] OSPF - How large can a flat network grow?
He's talking about having all routers in OSPF area 0, not a truly flat L2
broadcast-domain nightmare.
On Thu, Jun 7, 2018 at 5:15 PM, Chuck McCown <ch...@wbmfg.com> 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 Skype: brough
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