IGP Routing Protocol Extensions for Discovery of Upstream Label Assignment Node Capability

Document Type Expired Internet-Draft (individual)
Authors Yannick Brehon  , Martin Vigoureux  , Laurent Ciavaglia  , Mohamad Chaitou  , Zafar Ali 
Last updated 2007-11-19
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document proposes an extension to [TE-NODE-CAP] in order to support additional TE node capabilities in the context of Point-to- MultiPoint (P2MP) LSP routing and fast reroute protection. As for point-to-point LSP, nesting P2MP LSPs, i.e., MPLS P2MP hierarchy, is a desirable traffic-engineering feature. However, nesting P2MP LSPs requires a mechanism to coordinate the label allocation of the inner P2MP LSP between the egress nodes of the P2MP Tunnel as described in [MPLS-UPSTREAM]. To solve this issue, a new label allocation scheme called Upstream Label Assignment (ULA) is defined. Network elements responsible for the route computation of P2MP LSP should be aware of the nodes that support this functionality. For that purpose, we define a new bit flag to the TE Node Capability Descriptor as defined in [TE-NODE-CAP]. The bit flag (U) enables a node to advertise its capability to accept Upstream Label Assignment.


Yannick Brehon (Yannick.Brehon@alcatel-lucent.fr)
Martin Vigoureux (martin.vigoureux@alcatel-lucent.fr)
Laurent Ciavaglia (Laurent.ciavaglia@alcatel-lucent.fr)
Mohamad Chaitou (Mohamad.Chaitou@orange-ftgroup.com)
Zafar Ali (zali@cisco.com)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)