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Title : IGP Routing Protocol Extensions for Discovery of Upstream Label Assignment Node Capability
Author(s) : Y. Brehon, et al.
Filename : draft-brevigcia-ccamp-mpls-upstream-node-cap-00.txt
Pages : 18
Date : 2007-11-13
This document proposes to extend [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 into P2MP Tunnels 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.
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