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MPLS

MPLS. Multiprotocol Label switching. WAN Topologies. Basic Multiprotocol Label Switching (MPLS) Features. MPLS reducere routings check. MPLS sender pakker ved hjælp af labels. Labels bliver brugt som IP. (Det kan samlignes med normal ip addresering) Labels kan også have andre parametre med:

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MPLS

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  1. MPLS • Multiprotocol Label switching

  2. WAN Topologies

  3. Basic Multiprotocol Label Switching (MPLS) Features • MPLS reducere routings check. • MPLS sender pakker ved hjælp af labels. • Labels bliver brugt som IP. (Det kan samlignes med normal ip addresering) • Labels kan også have andre parametre med: • Layer 3 (VPN destination) • Layer 2 • Udgående port på egrees router. (Gateway router) • QOS • Source addressen • MPLS understøtter alle layer 3 protokoller.

  4. MPLS Operation • Only edge routers must perform a routing lookup. • Core routers switch packets based on simple label lookups and swap labels.

  5. Label Switch Routers (LSRs) • LSR primarily forwards labeled packets (swap label). • Edge LSR: • Labels IP packets (impose label) and forwards them into the MPLS domain. • Removes labels (pop label) and forwards IP packets out of the MPLS domain.

  6. CEF CEF CEF CEF Cisco IOS Platform Switching Mechanisms • Process switching, or routing table-driven switching: • Full lookup is performed at every packet • Fast switching, or cache-driven switching: • Most recent destinations are entered in the cache • First packet is always process-switched • Topology-driven switching: • CEF (prebuilt FIB table) Cisco Express Forwarding

  7. Fast IP Switching Overview . . .

  8. CEF Switching Overview . . .

  9. MPLS Characteristics • MPLS technology is intended to be used anywhere, regardless of Layer 1 media and Layer 2 protocol. • MPLS uses a 32-bit label field that is inserted between Layer 2 and Layer 3 headers. • MPLS over ATM uses the ATM header as the label (cell mode MPLS).

  10. Frame Mode MPLS Operation Note: The type or protocol ID field indicates as MPLS enabled layer-3 protocol.

  11. Major Components of MPLS Architecture • Control plane: • Exchanges routing information and labels • Contains complex mechanisms, such as OSPF, EIGRP, IS-IS, and BGP, to exchange routing information • Exchanges labels, such as LDP, BGP, and RSVP • Data plane: • Forwards packets based on labels • Has a simple forwarding engine

  12. Control Plane Components Example • Information from control plane is sent to the data plane.

  13. IP CEF (i config mode) • For at kører mpls interface: • Skriv mpls ip (så kører man med mpls) • Mpls label protocol (TDP for cisco’s egen og LDP hvis det ikke er cisco udstyr).

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