Method and system of overlay flow control

A non-transitory machine readable medium storing a program for execution by a set of processing units, the program for distributing routes among first and second routers of a first site comprising a first-site network and connected to one or more other sites through a wide area network (WAN), the program comprising sets of instructions for:

• at a first edge router that uses a first WAN link that is a multiprotocol label switching (MPLS) link to connect the first site to a second site through the WAN:
• receiving a set of border gateway protocol (BGP) routes for an MPLS network accessed through the MPLS link;
• and
• using an open shortest path first (OSPF) protocol to distribute the set of BGP routes to a second edge router that uses a second WAN link to connect the first site to the second site through the WAN,
• wherein the second edge router connects the first-site network to a public network, and
• wherein the set of BGP routes is a first set of routes based on a first BGP routing protocol;
• and
• receiving, from the second edge router, a second set of routes based on a second routing protocol for the public network accessed through the second WAN link.