Network Working Group D. Saucez
Internet-Draft INRIA
Intended status: Experimental O. Bonaventure
Expires: June 23, 2014 UCLouvain
L. Iannone
Telecom ParisTech
C. Filsfils
Cisco Systems
December 20, 2013
LISP ITR Graceful Restart
draft-saucez-lisp-itr-graceful-03.txt
Abstract
The Locator/ID Separation Protocol (LISP) is a map-and-encap
mechanism to enable communications between hosts identified with
their Endpoint IDentifier (EID) over the Internet where EIDs are not
routable. To do so, packets toward EIDs are encapsulated in packets
with routing locators (RLOCs) to form dynamic tunnels. An Ingress
Tunnel Router (ITR) that encapsulates EID packets determines tunnel
endpoints via mappings that associate EIDs to RLOCs. Before
encapsulating a packet, the ITR queries the mapping system to obtain
the mapping associated to the EID of the packet it must encapsulate.
Such mapping is cached by the ITR in its local EID-to-RLOC cache for
any subsequent encapsulation for the same EID. LISP is scalable
because EID-to-RLOC mappings are cached on ITRs. Initially, the
cache is empty and is populated progressively according to the
traffic traversing the ITR. However, after an ITR is restarted,
e.g., for maintenance reason, its cache is empty which means that all
packets that are re-routed to the freshly restarted ITR will cause
cache misses and a potentially high loss rate. In this draft, we
present mechanisms to reduce the negative impact on traffic caused by
the restart of an ITR in a LISP network.
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
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
Saucez, et al. Expires June 23, 2014 [Page 1]Internet-Draft LISP Graceful Restart December 2013
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on June 23, 2014.
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
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 . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Definition of terms . . . . . . . . . . . . . . . . . . . . . 3
2.1. LISP Definition of Terms . . . . . . . . . . . . . . . . 4
3. Problem Statement . . . . . . . . . . . . . . . . . . . . . . 6
4. ITR Graceful Restart . . . . . . . . . . . . . . . . . . . . 7
5. Security Considerations . . . . . . . . . . . . . . . . . . . 8
6. Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . 9
7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 9
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 9
8.1. Normative References . . . . . . . . . . . . . . . . . . 9
8.2. Informative References . . . . . . . . . . . . . . . . . 9
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 10
1. Introduction
The Locator/ID Separation Protocol (LISP) [RFC6830] relies on two
principles. First, Endpoint Identifiers (EIDs) are allocated to
hosts while Routing Locators (RLOCs) are allocated to LISP Ingress
Tunnel Routers (ITR) and Egress Tunnel Routers (ETR). EIDs are not
datatracker.ietf.org