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Enterprise network as an ISP with a single huge customer

Subject: Enterprise network as an ISP with a single huge customer Date: Fri, Jun 12, 2015 at 08:08:29PM +0300 Quoting Stepan Kucherenko (twh at megagroup.ru):
> Hello,
> 
> I'm sure lots of you work for big enterprises, and some of you work
> for biggest of them.
> 
> How many of you architect your network as an ISP, with that
> enterprise as the biggest customer ? Office networks in l3vpn,
> VPLS/EVPN on top of your own network for DCI, etc ? Or is it usually
> just a single IGP domain with no unnecessary bells and whistles ?

We do at $dayjob (public service radio station network). We try to stay
away from the TE side of MPLS, but the other knobs are in pretty much use.

A lot of our newer uses for the network are realtime audio in
hi-fi quality. Latency is our enemy, and so we don't do TCP, we skip
retransmits, buffers to be able to wait for a late packet are so short
it rarely matters, etc. That means a lot of prioritisation being done. It
is easier in our "isp-type" network.
 
As a very distributed company (in meatspace, but at the same time very
unified in infrastructure) we sure need the flexibility. Doing
this on usual VLAN/routing would not fly very well. A lot of the devices
we run aren't really fit for living with other networked devices,
especially those devices fondled by Users. We usually just push them in
another VRF.
 
> Do you think one approach is better than the other ? If so, why ?

I'd love to have a single flat routing domain. But I do not think it
works with the kind of legacy stuff (some of it brand new...) we run.

> I understand that it usually comes down to specific circumstances
> and most likely scale but I'd still love to hear about your
> experience.

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