In MPLS packet processing, what is the role of the peer PE after receiving a packet?

In MPLS (Multiprotocol Label Switching) packet processing, the role of the peer Provider Edge (PE) router after receiving a packet is to transmit packets to the correct Virtual Private Network (VPN) based on the inner label. This means that once the MPLS packet arrives at the peer PE, it examines the inner label to determine the appropriate destination or VPN for the packet's payload.

The inner label is critical in maintaining the context of the original traffic, as it often identifies specific end-user sessions or applications that the data pertains to. The MPLS network uses the outer label primarily for routing through the MPLS infrastructure, while the inner label provides the necessary information for the PE router to properly deliver the packet to the right end host or service associated with its respective VPN.

Injecting new labels into the packet involves label assignment which typically happens at the ingress PE before the packets are sent into the MPLS network. Eliminating both labels from the packet generally occurs at the egress PE when packets are being sent out of the MPLS network toward their final destination, not at the peer PE. Forwarding packets regardless of labels would undermine the MPLS architecture, as labels are essential for proper routing and delivery within the MPLS framework.

Thus