Entropy label for seamless MPLS
draft-ravisingh-mpls-el-for-seamless-mpls-03

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Last updated 2014-10-27
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MPLS Working Group                                              R. Singh
INTERNET-DRAFT                                                   Y. Shen
Intended Status: Proposed Standard                              J. Drake
Expires: April 30, 2015                                 Juniper Networks
                                                        October 27, 2014

                    Entropy label for seamless MPLS
              draft-ravisingh-mpls-el-for-seamless-mpls-03

Abstract

   This document describes certain optimizations to how entropy labels
   can be used for load balancing in a seamless MPLS architecture, as
   enabled by LSP concatenation and LSP hierarchies.

   The definition of the control plane and data plane behavior at LSP
   concatenation points; and at the ingress of an LSP in a hierarchy of
   LSPs, as described in this document, brings the benefits of entropy
   labels to certain deployment scenarios that may not have had such
   benefits as specified in [EL-RFC].

   This document, if approved, updates RFC 6790.

Status of this Memo

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Singh, et al.            Expires April 30, 2015                 [Page 1]
INTERNET DRAFT      Entropy label for seamless MPLS     October 27, 2014

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Table of Contents

   1  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . .  5
   3. Key attributes of the entropy label solution: Summary from 
      [EL-RFC]  . . . . . . . . . . . . . . . . . . . . . . . . . . .  6
   4. Problems and Motivation . . . . . . . . . . . . . . . . . . . .  7
     4.1 EL applicability for seamless MPLS . . . . . . . . . . . . .  7
     4.2 EL for LSP concatenation . . . . . . . . . . . . . . . . . .  8
       4.2.1 Spectrum of EL usage behaviors required to be 
             supported for concatenated LSPs  . . . . . . . . . . . .  9
         4.2.1.1 Entropy label for per-segment LSP  . . . . . . . . .  9
         4.2.1.2 Entropy label for notional-segment-LSP(s)  . . . . . 10
         4.2.1.3 Entropy label for e2e LSP  . . . . . . . . . . . . . 10
     4.3 EL for LSP hierarchy . . . . . . . . . . . . . . . . . . . . 10
       4.3.1 Possibility of unnecessary reduction of max-payload of
             the LSP: . . . . . . . . . . . . . . . . . . . . . . . . 11
       4.3.2 Possibility of EL being non-usable for load-balancing: . 12
   5. EL for LSP concatenation/hierarchy  . . . . . . . . . . . . . . 13
     5.1 Additional EL abstractions: specific to LSP 
         concatenation/hierarchy  . . . . . . . . . . . . . . . . . . 13
     5.2 New abstractions: EL applicability for LSP concatenation . . 13
       5.2.1 Signaling  . . . . . . . . . . . . . . . . . . . . . . . 13
         5.2.1.1 Signaling ELC at concatenation points (Translation
                 rules) . . . . . . . . . . . . . . . . . . . . . . . 15
       5.2.2 Data plane aspects . . . . . . . . . . . . . . . . . . . 16
         5.2.2.1 LSP concatenation: Differing EL dispositions . . . . 16
     5.3 New abstractions: EL applicability for LSP hierarchy . . . . 18
       5.3.1 Management plane:  . . . . . . . . . . . . . . . . . . . 18
       5.3.2 Data plane aspects . . . . . . . . . . . . . . . . . . . 19
   6. Use-cases . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
 

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