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# MPLS Features

The following major features are currently supported by MPLS:

- BFD fast failure detection for RSVP-TE adjacencies
- Differentiated services
- Interface support
  - ATM AAL5 (RSVP-TE only)
  - ATM1483 (point-to-point AAL5SNAP only)
  - Ethernet/VLAN
  - GRE
  - Multilink PPP
  - POS (PPP over HDLC)
  - PPP
  - SLEP (Cisco HDLC)
- Label stacking
  - Virtual Private Networks (VR-based and BGP-based)
  - Layer 2 Services over MPLS
- LER functionality
- LSR functionality
- Spoof checking
- LDP graceful restart
- ECMP
- Topology-driven LSPs (LDP) including support of LDP over RSVP tunnels
- Traffic engineering (RSVP-TE)
  - Constraint-based explicit routing
  - Statically configured explicit routing
  - Hop-by-hop routing
  - Admission control and bandwidth enforcement
  - Tunnels used by IGP as next hops in SPF calculation
  - Tunnel ingress controlled failure recovery
  - Facility back-up-style fast-route
- Traffic support
  - Layer 2 frames: ATM, Ethernet, Frame Relay, HDLC, PPP, VLAN
  - Layer 3 datagrams: IPv4, IPv6
- Point-to-multipoint LSP support
  - Data replication at branch nodes
  - E-series routers as egress LSRs

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