| MPLS consists of 3 components: |
| 1. MPLS forwarding |
| 2. MPLS signalling |
| 3. Mapping layer 3 traffic onto MPLS LSPs |
| |
| The document mpls-forwarding basics explains item 1. |
| |
| Examples of MPLS signalling protocols are: RSVP-TE LDP and CR-LDP. |
| The package ldp-portable is an implementation of LDP and contains more |
| information about LDP based MPLS signalling. |
| |
| Mapping of layer 3 traffic to MPLS LSPs is accomplised in a couple of |
| different ways. |
| -Per FEC where FEC is an entry in the routing table |
| -Virtual interface that represents an LSP |
