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SP Lab: MPLS TE

  • Information distribution

IGP extensions flood available bandwidth information, OSPF uses Type 10 (area-local) Opaque LSAs, ISIS uses new TLVs

  • Path selection/calculation

TE Head-end does a “Constrained SPF” (CSPF) calculation to find the best path, Path can also be explicitly configured

  • Path setup

RSVP used to set up TE LSP, PATH messages (from head to tail) carries LABEL_REQUEST, RESV messages (from tail to head) carries LABEL

  • Trunk admission control

On receipt of PATH message, Router will check there is bandwidth available to honour the reservation, On receipt of a RESV message, Router actually reserves the bandwidth for the TE LSP

  • Forwarding traffic on to tunnel

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© 2008 Cisco Systems, Inc. All rights reserved.

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