On 8/25/23 09:41, Tarko Tikan wrote:
AFAIK this reflects the reality very well. There are huge PBB deployments in very large networks but the overall number of networks, using PBB, is very low. Even in those networks PBB is/will be phased out so don't expect any new deployments. It is still well supported by the vendors who initially invested into PBB.
Most operators, especially of small-to-medium size scope, but even some larger ones, will go from 802.1Q to Q-in-Q, and then to MPLS.
MPLS end-to-end is not as common as MPLS combined with 802.1Q or Q-in-Q, in my very rough anecdotal experience. This is mostly due to cost control, as well as a seemingly common preference to have a so-called Internet Gateway (IGW) pinning all those pseudowires.
There have been ramblings of VXLAN as an IP-based underlay in lieu of MPLS. I don't know how well it has scaled outside of the data centre, i.e., in the Metro-E network. But the rate at which I hear about VXLAN for Metro-E deployments is also the same rate at which I don't hear about VXLAN for Metro-E deployments. In other words, it appears to be neither here nor there.
Mark.
