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 <(617)%20285-0433> Skype: brough >> netBlazr Inc. <http://www.netblazr.com/> | Google+ >> <https://plus.google.com/102447512447094746687/posts?hl=en> | Twitter >> <https://twitter.com/#%21/brough> | LinkedIn >> <http://www.linkedin.com/in/broughturner> | Facebook >> <http://www.facebook.com/brough.turner> | Blog >> <http://blogs.broughturner.com/> | Personal website >> <http://broughturner.com/> >> >> >> >
