Application-aware Targeted LDP
MPLS Working Group
Recent targeted Label Distribution Protocol (tLDP) applications such
as remote loop-free alternate (LFA) and BGP auto discovered
pseudowire may automatically establish a tLDP session to any Label
Switching Router (LSR) in a network. The initiating LSR has
information about the targeted applications to administratively
control initiation of the session. However, the responding LSR has no
such information to control acceptance of this session. This document
defines a mechanism to advertise and negotiate Targeted Applications
Capability (TAC) during LDP session initialization. As the
responding LSR becomes aware of targeted applications, it may
establish a limited number of tLDP sessions for certain applications.
In addition, each targeted application is mapped to LDP Forwarding
Equivalence Class (FEC) Elements to advertise only necessary LDP FEC-
label bindings over the session. This document updates RFC 7473 for
enabling advertisement of LDP FEC-label bindings over the session.
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