A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Multiprotocol Label Switching Working Group of the IETF.
Title : Improving Topology Data Base Accuracy with Label
Switched Path Feedback in Constraint Based Label
Distribution Protocol
Author(s) : P. Ashwood-Smith, B. Jamoussi, D. Fedyk, D. Skalecki
Filename : draft-ietf-mpls-te-feed-06.txt
Pages : 13
Date : 2003-6-27
One key component of traffic engineering is a concept known as
constraint based routing. In constraint based routing a topology
database is maintained on all participating nodes. This database
contains a complete list of all the links in the network that
participate in traffic engineering and for each of these links a set
of constraints, which those links can meet. Bandwidth, for example,
is one essential constraint. Since the bandwidth available changes
as new LSPs are established and terminated the topology database
will develop inconsistencies with respect to the real network. It is
not possible to increase the flooding rates arbitrarily to keep the
database discrepancies from growing. A new mechanism is proposed
whereby a source node can learn about the successes or failures of
its path selections by receiving feedback from the paths it is
attempting. This information is most valuable in failure scenarious
but is benificial during other path setup functions as well. This
fed-back information can be incorporated into subsequent route
computations, which greatly improves the accuracy of the overall
routing solution by significantly reducing the database
discrepancies.
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