CCUG Meeting MPLS/L3VPN LAB. wikipedia.org What is MPLS? MPLS is a highly scalable, protocol agnostic, data-carrying mechanism. In an MPLS network, data.

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Presentation transcript:

CCUG Meeting MPLS/L3VPN LAB

wikipedia.org What is MPLS? MPLS is a highly scalable, protocol agnostic, data-carrying mechanism. In an MPLS network, data packets are assigned labels. Packet- forwarding decisions are made solely on the contents of this label, without the need to examine the packet itself. This allows one to create end-to-end circuits across any type of transport medium, using any protocol.

MPLS-Enabled Applications Original goals of MPLS Scalability of network layer routing Greater flexibility in delivering routing services Increased performance Simplify integration of routers with cell switching based technologies

wikipedia.org How does MPLS Work? MPLS works by prefixing packets with an MPLS header, containing one or more "labels". This is called a label stack.

wikipedia.org What is a label? A label is a short, four-byte, fixed-length, locally- significant identifier which is used to identify a Forwarding Equivalence Class (FEC). The label is imposed between the data link layer (Layer 2) header and network layer (Layer 3) header. The top of the label stack appears first in the packet, and the bottom appears last. The network layer packet immediately follows the last label in the label stack.

wikipedia.org How does the Label move throughout the network? These MPLS-labeled packets are switched after a Label Lookup/Switch instead of a lookup into the IP table. The entry and exit points of an MPLS network are called Label Edge Routers (LER), or Provider Edge Routers which, respectively, push an MPLS label onto an incoming packet and pop it off the outgoing packet.

wikipedia.org How does the Label move throughout the network? Routers that perform routing based only on the label are called Label Switch Routers (LSR) or Provider Routers. Labels are distributed between LERs and LSRs using the “Label Distribution Protocol” (LDP)

cisco.com What platforms and Cisco IOS support MPLS? Cisco Series 2691, 3640, 3660, 3725, 3745, 6400-NRP-1, 6400-NRP-2SV, 6400-NSP, Catalyst 5000 with Route Switch Module (RSM), 7200, 7301, 7400, 7500, Catalyst 6500/Cisco 7600 Series with WS-SUP720-3B and WS-SUP720-3BXL, Gigabit Switch Router (GSR), Route Processor Module (RPM), Universal Broadband Router (UBR) 7200, AS5350, and IGX8400-URM all support MPLS.

Lab MPLS/L3VPN Lab

Sources MPLS-Enabled Applications: Emerging Developments and New Technologies  Ina Minei, Julian Lucek  ISBN-10:  ISBN-13: