SP Lab: MPLS TE
IGP extensions flood available bandwidth information, OSPF uses Type 10 (area-local) Opaque LSAs, ISIS uses new TLVs
TE Head-end does a “Constrained SPF” (CSPF) calculation to find the best path, Path can also be explicitly configured
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
© 2008 Cisco Systems, Inc. All rights reserved.