draft-ietf-rtgwg-lfa-applicability-02.txt   draft-ietf-rtgwg-lfa-applicability-03.txt 
Network Working Group Clarence Filsfils Network Working Group Clarence Filsfils
Internet-Draft Cisco Systems Internet-Draft Cisco Systems
Expires: November 5, 2011 Pierre Francois Intended status: Informational Pierre Francois
UCLouvain Expires: February 18, 2012 UCLouvain
Mike Shand Mike Shand
Cisco Systems Cisco Systems
Bruno Decraene Bruno Decraene
France Telecom France Telecom
James Uttaro James Uttaro
ATT ATT
Nicolai Leymann Nicolai Leymann
Martin Horneffer Martin Horneffer
Deutsche Telekom Deutsche Telekom
May 4, 2011 August 17, 2011
LFA applicability in SP networks LFA applicability in SP networks
draft-ietf-rtgwg-lfa-applicability-02 draft-ietf-rtgwg-lfa-applicability-03
Abstract Abstract
In this draft, we analyze the applicability of LoopFree Alternates in In this draft, we analyze the applicability of LoopFree Alternates in
both core and access parts of Service Provider networks. We provide both core and access parts of Service Provider networks. We provide
design guides to favor their applicability where relevant, typically design guides to favor their applicability where relevant, typically
in the access part of the network. in the access part of the network.
Status of this Memo Status of this Memo
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/. Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on November 5, 2011. This Internet-Draft will expire on February 18, 2012.
Copyright Notice Copyright Notice
Copyright (c) 2011 IETF Trust and the persons identified as the Copyright (c) 2011 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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7. Capacity Planning with LFA in mind . . . . . . . . . . . . . . 27 7. Capacity Planning with LFA in mind . . . . . . . . . . . . . . 27
7.1. Coverage Estimation - Default Topology . . . . . . . . . . 27 7.1. Coverage Estimation - Default Topology . . . . . . . . . . 27
7.2. Coverage estimation in relation to traffic . . . . . . . . 28 7.2. Coverage estimation in relation to traffic . . . . . . . . 28
7.3. Coverage verification for a given set of demands . . . . . 28 7.3. Coverage verification for a given set of demands . . . . . 28
7.4. Modeling - What-if Scenarios - Coverage impact . . . . . . 28 7.4. Modeling - What-if Scenarios - Coverage impact . . . . . . 28
7.5. Modeling - What-if Scenarios - Load impact . . . . . . . . 29 7.5. Modeling - What-if Scenarios - Load impact . . . . . . . . 29
7.6. Discussion on metric recommendations . . . . . . . . . . . 29 7.6. Discussion on metric recommendations . . . . . . . . . . . 29
8. Security Considerations . . . . . . . . . . . . . . . . . . . 30 8. Security Considerations . . . . . . . . . . . . . . . . . . . 30
9. IANA considerations . . . . . . . . . . . . . . . . . . . . . 30 9. IANA considerations . . . . . . . . . . . . . . . . . . . . . 30
10. Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . 30 10. Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . 30
11. References . . . . . . . . . . . . . . . . . . . . . . . . . . 31 11. Informative References . . . . . . . . . . . . . . . . . . . . 31
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 31 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 31
1. Introduction 1. Introduction
In this document, we analyze the applicability of LoopFree Alternates In this document, we analyze the applicability of LoopFree Alternates
in both core and access parts of Service Provider networks. We in both core and access parts of Service Provider networks. We
provide design guides to favor their applicability where relevant, provide design guides to favor their applicability where relevant,
typically in the access part of the network. typically in the access part of the network.
We first introduce the terminology used in this document in We first introduce the terminology used in this document in
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node LFA coverage. node LFA coverage.
A second objective consisted in describing the three different A second objective consisted in describing the three different
profiles of LFA applicability for the IP/MPLS core networks and profiles of LFA applicability for the IP/MPLS core networks and
illustrating them with simulation results based on real SP core illustrating them with simulation results based on real SP core
topologies. topologies.
Future versions of this document will cover additional access Future versions of this document will cover additional access
topologies and will describe multicast applicability. topologies and will describe multicast applicability.
11. References 11. Informative References
[RFC5714] Shand, M. and S. Bryant, "IP Fast Reroute Framework", [RFC5714] Shand, M. and S. Bryant, "IP Fast Reroute Framework",
RFC 5714, January 2010. RFC 5714, January 2010.
Authors' Addresses Authors' Addresses
Clarence Filsfils Clarence Filsfils
Cisco Systems Cisco Systems
Brussels 1000 Brussels 1000
BE BE
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