Vyatta NOS documentation

Learn how to install, configure, and operate Vyatta Network Operating System (Vyatta NOS), which helps to drive our virtual networking and physical platforms portfolio.

MPLS Overview

Multiprotocol Label Switching (MPLS) on the vRouter provides the data plane support and the basic Label Distribution Protocol (LDP) and Resource Reservation Protocol for Traffic Engineering (RSVP-TE) support that serves as a foundation on which to build additional features.

The following support is provided:
  • Basic MPLS forwarding
  • LDP
  • RSVP-TE

Basic MPLS forwarding support

The following basic MPLS forwarding features are supported:

  • Label Switched Paths (LSPs) using IPv4 next hops
  • Imposition of labels onto IPv4 packets
  • Routes with de-aggregate to global tables
  • ECMP for imposition and labeled routes
  • IP fragmentation
  • IP traceroute using LSPs (when TTL propagation is enabled)
  • Generation of too-big ICMP (when the MTU is exceeded with the DF bit set)
  • Configurable TTL propagation
  • Configurable label table size
  • Per-interface packet statistics

LDP support

The following LDP features are supported:

  • Label allocation and advertisement control
    • Outbound filtering

    • Allocation control; only label ranges supported

  • Null label allocation
    • Explicit null if configured; implicit null if not configured
    • Session authentication

  • IGP synchronization

  • Downstream-on-demand advertisement mode

  • IPv4 LSPs

  • ECMP for imposition and labeled routes

  • Graceful restart helper

  • Operation in default VRF only

RSVP-TE support

The following RSVP features are supported:

  • CSPF OSPF computation (resource utilization)
  • Explicit path (loose and strict)
  • Fast reroute with one-to-one protection
  • IGP shortcut (IGP routes through a tunnel)
  • IPv4 point-to-point tunnels
  • Node and link protection
  • Path affinities
  • Reoptimization
  • Record route
  • Refresh reduction (scalability)
  • Shared explicit filter
  • Tail end implicit or explicit null signaling
  • RSVP operation in default VRF only
  • Graceful restart
  • Tunnels to destinations outside the OSPF area

Not yet supported

The following features are not currently supported:
  • L3VPN
  • Diffserv-aware TE
  • Facility backup
  • MPLS QoS
  • Point-to-multipoint tunnels
  • Shared Risk Link Groups (SRLG)