MPLS network architecture
Figure 3: MPLS network architecture
An MPLS network has the following types of LSRs:
Ingress LSR—Ingress LSR of packets. It labels packets entering into the MPLS network.
Transit LSR—Intermediate LSRs in the MPLS network. The transit LSRs on an LSP forward packets to the egress LSR according to labels.
Egress LSR—Egress LSR of packets. It removes labels from packets and forwards the packets to their destination networks.