Provider router

In Multiprotocol Label Switching (MPLS), a P router or provider router is a label switch router (LSR) that functions as a transit router of the core network.

Here's one scenario: A customer who has facilities in LA and Atlanta wants to connect these sites over an MPLS VPN provided by AT&T.

To do this, the customer would purchase a link from the on-site CE router to the PE router in AT&T's central office in LA and would also do the same thing in Atlanta.

The PE routers would connect over AT&T's backbone routers (P routers) to enable the two CE routers in LA and Atlanta to communicate over the MPLS network.

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