1, CE: Customer Edge,
Customer Edge Device, is the customer-side router to which the service provider is connected.CE routers provide service access to subscribers by connecting to one or more PE routers.A CE router is usually an IP router that establishes an adjacency relationship with the connected PE routers.
2. PE (Provider Edge),
that is, Provide's edge device, the edge router of the service provider backbone network, which is equivalent to the label edge router (LER).PE router connects the CE router and the P router, and is the most important network node. Subscriber traffic flows into the subscriber network through the PE router or to the MPLS backbone through the PE router.
3, AR:
refers to the access router; general ip network, according to its topology, the router can be divided into access router ar,edge router br,core router cr.
PE or AR is basically a concept, some operators called PE such as Unicom, some operators called AR such as mobile. It is called access router, which is the direct superior router of CE. All softswitch sites accessing the CE are uplinked to the PE or AR, which then accesses the carrier's IP backbone.
Expanded Information
1, general ip network, according to its topology, the router can be divided into access router ar, edge router br, core router cr.
2, PE or AR is basically a concept, some carriers are called PE such as Unicom, and some carriers are called AR such as mobile. AR for example mobile. It is called access router and is the direct superior router of CE. All softswitch sites accessing CE are uplinked to PE or AR, and then PE or AR accesses the carrier's IP backbone.
3. The three major carriers have different names for what is essentially the same equipment role:
Carrier backbone (core) router -- carrier edge (access) router -- subscriber edge router: P (CR) --PE (AR) --CE (BR)