MPLS Payload

Hello experts

I was reading MPLS Fundamental book. In Chapter 2 page 36, they have
mentioned that MPLS Label do not have network level identifier. It is the
egress router that created label for the FEC and when that label arrives at
the Egress LSR it knows that this label belongs to which FEC.

My question here is packets are classified at the ingress router and they
been allocated to a FEC. How do Egress LSR has communicated to Ingress
router that which label to choose for which FEC.

May be I misunderstood, then what is correct and how Egress router know
that what is the payload of MPLS packet.

I am not talking about MPLS VPN here, but the simple MPLS.

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Thanks&regards
Vishal
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