Do we have to replace MPLS all at once to move to a modern network?

No. FirstNet moves sites in phases: a Peplink router can run your MPLS line alongside internet links while each site moves across. A typical path: - Pilot one site: add FirstNet broadband next to the existing MPLS line and steer selected traffic over it - Move users to Cloudflare zero trust access, so private apps no longer depend on the MPLS core - Retire MPLS site by site as contracts end, keeping a hybrid design where an application still needs it This keeps every site online during the move and spreads the change over contract renewal dates rather than a single cutover weekend.

Replacing MPLS in phases

Short answer

No. FirstNet moves sites in phases: a Peplink router can run your MPLS line alongside internet links while each site moves across.

In detail: Replacing MPLS in phases

A typical path:

Pilot one site: add FirstNet broadband next to the existing MPLS line and steer selected traffic over it
Move users to Cloudflare zero trust access, so private apps no longer depend on the MPLS core
Retire MPLS site by site as contracts end, keeping a hybrid design where an application still needs it

This keeps every site online during the move and spreads the change over contract renewal dates rather than a single cutover weekend.

Source: FirstNet Modern Network service page →