MPLS w wersji zaawansowanej.pdf

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BENEFITS OF MPLS

  Some benefits of MPLS include:

   Improved route lookup time by using labels to forward traffic

   Additional control over how traffic moves through the network using

traffic engineering

   High Availability

   Increased scalability

LSP A

LSP B

HIGH AVAILABILITY

  Ultimate goal – avoid business impact.

  Business = working service – avoid service disruption or degradation.

  Service disruption:

   Loss for connectivity = continues packet loss over period of time T

   1GE = 512B with 880Mp/h; 1% loss is 8Mp/h; is continuous - ~38 sec.

   Delay, jitter, random packet loss (non-continuous)

   1GE = 512B with 880Mp/h; 1% loss is 8Mp/h; is equally distributed –

multiple breaks 4us each.

  Challenges:

   Failures – loss of connectivity

   Congestions

   Avoid: capacity planning and topology/link engineering, MPLS LSP path

engineering (non-SPF routes).

   Manage when happens: QoS tooklit.

MPLS LSP PATH ENGINEERING (NON-SPF ROUTES)

  Technology is there

  Very really used to fine tune path in order to optimize capacity

utilization:

   OPEX intensive

   Multiple possible good states – no network banchmark

   Dynamic or not adaptive to changing traffic pattern

   Capacity is cheap, at least in Europe

  Is used to control load balancing, SLRG, and as supportibe

mechanism for other MPLS applications.

LABEL DISTRIBUTION PROTOCOLS

  Overview of Label Distribution Protocols

   Often referred to as signaling protocols

   Dynamically establishes a LSP

   Exchanges label information

   Examples of label distribution protocols.

   Resource Reservation Protocol (RSVP)

   Label Distribution Protocol (LDP)

   Border Gateway Protocols (BGP)

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