It is tough to argue against VXLAN or anything over UDP, but another workhorse of L2 services, especially for cheaper equipment and needing to go over the top was L2TPv3.  

Some interesting stuff was done by Wireguard and Softether, but I am not sure it counts as service. MPLS-TP is still listed in MEF specs, but the hopefully equipment supporting that is collecting dust on shelves somewhere. 

There could even be a network somewhere that is doing some variation of SPB, hopefully converting to EVPN. 

On Fri, Jan 24, 2025 at 12:28 AM Bill Blackford <bblackford@gmail.com> wrote:
Wave circuits

On Jan 23, 2025, at 13:54, Jeff Behrns via NANOG <nanog@nanog.org> wrote:


Identify L2 control protocols which will require transparent tunneling end to end before making a decision on underlay tech.  Beware of multiple vendor handoffs / NNIs under the hood of any solution, but especially an "oMPLS" solution.

From: NANOG <nanog-bounces+behrnsjeff=yahoo.com@nanog.org> on behalf of Aaron1 <aaron1@gvtc.com>
Sent: Thursday, January 23, 2025 9:32:37 AM
To: Mike Hammett <nanog@ics-il.net>
Cc: nanog@nanog.org <nanog@nanog.org>
Subject: Re: Layer 2 Transport

We use mainly mpls/p2p pw so much for wholesale/business Ethernet, CBH, and various other purposes.  Still using mpls/vpls occasionally… oob mgmt backhaul.  For DC interconnect, I use evpn/mpls, since I have an mpls network.  We are an SP, so mpls has been the basis for our network-based-L2/L3 VPN’s for 10 years or so.

Aaron

On Jan 23, 2025, at 8:47 AM, Mike Hammett <nanog@ics-il.net> wrote:


What technologies are predominately in use today to transport layer 2 circuits?

MPLS\VPLS used to be all the rage.
eVPN\VXLAN seems to be popular in the datacenter space.
Carrier Ethernet?