{
  "draft": "draft-ietf-tewg-restore-hierarchy-01",
  "doc_id": "RFC3386",
  "title": "Network Hierarchy and Multilayer Survivability",
  "authors": [
    "W. Lai, Ed.",
    "D. McDysan, Ed."
  ],
  "format": [
    "TEXT",
    "HTML"
  ],
  "page_count": "27",
  "pub_status": "INFORMATIONAL",
  "status": "INFORMATIONAL",
  "source": "Internet Traffic Engineering",
  "abstract": "This document is the deliverable out of the Network Hierarchy \r\nand Survivability Techniques Design Team established within the \r\nTraffic Engineering Working Group.  This team collected and \r\ndocumented current and near term requirements for survivability \r\nand hierarchy in service provider environments.  For clarity, \r\nan expanded set of definitions is included.  The team \r\ndetermined that there appears to be a need to define a small \r\nset of interoperable survivability approaches in packet and \r\nnon-packet networks.  Suggested approaches include path-based \r\nas well as one that repairs connections in proximity to the \r\nnetwork fault.  They operate primarily at a single network \r\nlayer.  For hierarchy, there did not appear to be a driving \r\nnear-term need for work on 'vertical hierarchy,' defined as \r\ncommunication between network layers such as TDM/optical and \r\nMPLS.  In particular, instead of direct exchange of signaling \r\nand routing between vertical layers, some looser form of \r\ncoordination and communication, such as the specification of \r\nhold-off timers, is a nearer term need.  For 'horizontal \r\nhierarchy' in data networks, there are several pressing needs.  \r\nThe requirement is to be able to set up many LSPs in a service \r\nprovider network with hierarchical IGP.  This is necessary to \r\nsupport layer 2 and layer 3 VPN services that require edge-to-\r\nedge signaling across a core network.  \r\nPlease send comments to te-wg@ops.ietf.org \r\n         \r\n\r\n",
  "pub_date": "November 2002",
  "keywords": [
    "service",
    "provider",
    "packet networks",
    "protection",
    "restoration",
    "recovery"
  ],
  "obsoletes": [],
  "obsoleted_by": [],
  "updates": [],
  "updated_by": [],
  "see_also": [],
  "doi": "10.17487/RFC3386",
  "errata_url": null
}