Note: MPLS

Advantage of MPLS:
Intention was to reduce IP Lookups. Label switching lookups uses exact matching. CIDR uses longest match prefix but for Label Switching, the idea was to have only the first router do an IP Lookup and then all future routes in the network could do exact match switching based on a label.

ASIC have eliminated the CIDR issue but comes at a cost

Why do people still care about MPLS?
- Implementing traffic Engineering
- Implementing Multi-service Network
- Improve Resiliency (MPLS Fast Re-route)

Protocol used:
- Label Distribution Protocol (LDP) Simple non-constrained protocol (doesn't support traffic Engineering)
- Resource Reservation Protocol with Traffic Engineering (RSVP-TE)

Need to use both though - LDP can be used for Data Transportation (VPN MPLS) Services

* Configure LDP to Tunnel inside RSVP

Ref: retrieved and accessed on 26/03/2014 from https://www.nanog.org/meetings/nanog49/presentations/Sunday/mpls-nanog49.pdf