LDP Extensions for Hub and Spoke Multipoint Label Switched Path (RFC7140)
Original Publication Date: 2014-Mar-01
Included in the Prior Art Database: 2014-Mar-03
Internet Society Requests For Comment (RFCs)
L. Jin: AUTHOR [+4]
The point-to-multipoint (P2MP) Label Switched Path (LSP) defined in [RFC6388] allows traffic to transmit from root to several leaf nodes, and multipoint-to-multipoint (MP2MP) LSP allows traffic from every node to transmit to every other node. This document introduces a hub and spoke multipoint (HSMP) LSP, which has one root node and one or more leaf nodes. An HSMP LSP allows traffic from root to leaf through downstream LSP and also leaf to root along the upstream LSP. That means traffic entering the HSMP LSP at the root node travels along the downstream LSP, exactly as if it were traveling along a P2MP LSP, and traffic entering the HSMP LSP at any other leaf nodes travels along the upstream LSP toward only the root node. The upstream LSP should be thought of as a unicast LSP to the root node, except that it follows the reverse direction of the downstream LSP, rather than the unicast path based on the routing protocol. The combination of upstream LSPs initiated from all leaf nodes forms a multipoint-to-point LSP.
Internet Engineering Task Force (IETF) L. Jin Request for Comments: 7140 Category: Standards Track F. Jounay ISSN: 2070-1721 Orange CH IJ. Wijnands Cisco Systems, Inc N. Leymann Deutsche Telekom AG March 2014
LDP Extensions for Hub and Spoke Multipoint Label Switched Path
This document introduces a hub and spoke multipoint (HSMP) Label Switched Path (LSP), which allows traffic from root to leaf through point-to-multipoint (P2MP) LSPs and also leaf to root along the reverse path. That means traffic entering the HSMP LSP from the application/customer at the root node travels downstream to each leaf node, exactly as if it were traveling downstream along a P2MP LSP to each leaf node. Upstream traffic entering the HSMP LSP at any leaf node travels upstream along the tree to the root, as if it were unicast to the root. Direct communication among the leaf nodes is not allowed.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc7140.
Jin, et al. Standards Track [Page 1]
RFC 7140 LDP Extensions for HSMP LSP March 2014
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