Techniques are described for providing fast reroute inter-area node protection for label switched paths (LSPs) using label distribution protocol (LDP). In one example, a network device may be configured to determine that a protected node is an area border router, and use network topology information, obtained by an Interior Gateway Protocol (IGP) executing on the network device, to identify a second area border router in the same IGP area as the protected node, to which to automatically establish a bypass LSP and a targeted LDP session.

Inter-area LDP node protection

Seamless multipoint label distribution protocol (mLDP) transport over a bit index explicit replication (BIER) core may be provided. First, it may be determined that a first plurality of network devices comprise BIER edge routers. Then, in response to determining that the first plurality of network devices comprise BIER edge routers, a Targeted Label Distribution Protocol (T-LDP) session may be created between a first one of the first plurality of network devices and a second one of the first plurality of network devices. Next, an address of a peer device connected to the second one of the first plurality of network devices may be advertised by the second one of the first plurality of network devices over the T-LDP session.

Seamless multipoint label distribution protocol (mLDP) transport over a bit index explicit replication (BIER) core

Recent Targeted LDP applications such as Remote LFA and BGP auto
discovery FEC 129 pseudowire may automatically establish a targeted
LDP session to any LSR in the core network. The sender LSR has
information about the targeted applications to administratively
control initiation of the session. However the receiver LSR has no
such information to control the acceptance of this session. This
document defines a mechanism to advertise Targeted Application
Capability during session initialization. As the receiver LSR becomes
aware of targeted LDP applications, it may establish a limited number
of sessions for certain applications. In addition, each targeted
application is mapped to LDP FEC Elements to advertise only necessary
LDP FEC label bindings over the session.

Applications aware LDP Targeted Session

In general, the disclosure relates to techniques for initiating a targeted LDP session in a manner that includes information specifying one or more application for which a targeted LDP session is being initiated. In one example, a method includes receiving, by a network device, a LDP initialization message to initiate an Label Distribution Protocol (LDP) session with a peer network device, the LDP initialization message including a Targeted Applications Capability (TAC) field specifying one or more applications for which the LDP session is to be used for advertising forwarding equivalence class (FEC)-label bindings between the network device and the peer network device, and determining, by the network device, whether to allow the LDP session to be established based on the one or more applications specified in the TAC field.

Applications-aware targeted LDP sessions

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Applications aware LDP Targeted Session

Applications-aware targeted LDP sessions