Use of Multipath with MPLS and MPLS Transport Profile (MPLS-TP) (RFC7190)
Original Publication Date: 2014-Mar-01
Included in the Prior Art Database: 2014-Apr-01
Internet Society Requests For Comment (RFCs)
Today the requirement to handle large aggregations of traffic can be met by a number of techniques that we will collectively call "multipath". Multipath applied to parallel links between the same set of nodes includes Ethernet Link Aggregation [IEEE-802.1AX], link bundling [RFC4201], or other aggregation techniques, some of which could be vendor specific. Multipath applied to diverse paths rather than parallel links includes Equal-Cost Multipath (ECMP) as applied to OSPF, IS-IS, or BGP, and equal-cost Label Switched Paths (LSPs). Some vendors support load splitting across equal-cost MPLS LSPs where the load is split proportionally to the reserved bandwidth of the set of LSPs.
Internet Engineering Task Force (IETF) C. Villamizar Request for Comments: 7190 Outer Cape Cod Network Consulting Category: Informational March 2014 ISSN: 2070-1721
Use of Multipath with MPLS and MPLS Transport Profile (MPLS-TP)
Many MPLS implementations have supported multipath techniques, and many MPLS deployments have used multipath techniques, particularly in very high-bandwidth applications, such as provider IP/MPLS core networks. MPLS Transport Profile (MPLS-TP) has strongly discouraged the use of multipath techniques. Some degradation of MPLS-TP Operations, Administration, and Maintenance (OAM) performance cannot be avoided when operating over many types of multipath implementations.
Using MPLS Entropy Labels (RFC 6790), MPLS Label Switched Paths (LSPs) can be carried over multipath links while also providing a fully MPLS-TP-compliant server layer for MPLS-TP LSPs. This document describes the means of supporting MPLS as a server layer for MPLS-TP. The use of MPLS-TP LSPs as a server layer for MPLS LSPs is also discussed.
Status of This Memo
This document is not an Internet Standards Track specification; it is published for informational purposes.
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). Not all documents approved by the IESG are a candidate for any level of Internet Standard; see 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/rfc7190.
Villamizar Informational [Page 1]
RFC 7190 MPLS and MPLS-TP Multipath March 2014
Copyright (c) 2014 IETF Trust and the persons identified as the document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License.
Table of Contents
1. Introduction . ....