Connecting SPRING Islands over IP Networks
draft-xu-spring-islands-connection-over-ip-00

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Last updated 2014-02-07
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Network working group                                              X. Xu 
Internet Draft                                                    Huawei 
Category: Informational                                      S.Sivabalan        
                                                                   Cisco 
                                                                               
Expires: August 2014                                    February 8, 2014 
                                                                                
                                      
                 Connecting SPRING Islands over IP Networks  
                                      
               draft-xu-spring-islands-connection-over-ip-00 

Abstract 

   Segment Routing (SR) architecture [SR-ARCH] introduces a new MPLS 
   paradigm in which a sender of a packet is allowed to partially or 
   completely specify the route the packet takes through the network by 
   using stacked MPLS labels. The current SR architecture requires an 
   end-to-end MPLS Label Switched Path (LSP) between any two SR-enabled 
   routers (e.g., two adjacent hops of a given explicit path). In order 
   to enable SR to be deployed even when there are non-MPLS routers 
   along the path between two SR-enabled routers, it is desirable to 
   have an alternative, which allows the use of IP-based tunnels (e.g., 
   GRE tunnels) to connect two SR-enabled routers. This document 
   describes a mechanism for such usage. 

Status of this Memo 

   This Internet-Draft is submitted in full conformance with the   
   provisions of BCP 78 and BCP 79.  

   Internet-Drafts are working documents of the Internet Engineering   
   Task Force (IETF).  Note that other groups may also distribute   
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   Internet-Drafts are draft documents valid for a maximum of six months 
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   material or to cite them other than as "work in progress." 

   This Internet-Draft will expire on August 8, 2014. 

    

                                           

 
 
 
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Copyright Notice 

   Copyright (c) 2013 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   
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   publication of this document.  Please review these documents   
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   described in the Simplified BSD License. 

Conventions used in this document 

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", 
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this 
   document are to be interpreted as described in RFC-2119 [RFC2119]. 

Table of Contents 

    
   1. Introduction ................................................ 3 
   2. Terminology ................................................. 3 
   3. Packet Forwarding Process ................................... 3 
   4. Security Considerations ..................................... 4 
   5. IANA Considerations ......................................... 4 
   6. Acknowledgements ............................................ 4 
   7. References .................................................. 4 
      7.1. Normative References ................................... 4 
      7.2. Informative References  ................................ 4 
   Authors' Addresses ............................................. 4 

 
 
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1. Introduction 

   Segment Routing (SR) architecture [SR-ARCH] introduces a new MPLS 
   paradigm in which a sender of a packet is allowed to partially or 
   completely specify the route the packet takes through the network by 
   using stacked MPLS labels. In other words, this new paradigm could 
   support source routing by using the MPLS label stack where each MPLS 
   label represents a given hop that the packet must go through. Here 
   the MPLS label could be either locally significant or globally 
   significant.  

   The current SR architecture requires an end-to-end MPLS Label 
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