draft-ietf-idr-mrai-dep-03.txt   draft-ietf-idr-mrai-dep-04.txt 
Inter-Domain Routing P. Jakma Inter-Domain Routing P. Jakma
Internet-Draft DCS, Uni. of Glasgow Internet-Draft School of Computing Science,
Updates: rfc4271 October 12, 2010 Updates: 4271 (if approved) Uni. of Glasgow
(if approved) Intended status: Standards Track September 20, 2011
Intended status: Standards Track Expires: March 23, 2012
Expires: April 15, 2011
Revisions to the BGP 'Minimum Route Advertisement Interval' Revisions to the BGP 'Minimum Route Advertisement Interval'
draft-ietf-idr-mrai-dep-03 draft-ietf-idr-mrai-dep-04
Abstract Abstract
This document revises the specification of the BGP MRAI timer, by This document updates the specification of the BGP MRAI timer in
deprecating the previously recommended values and by allowing for [RFC4271], by deprecating the previously recommended values and by
withdrawals to be exempted from the MRAI. allowing for withdrawals to be exempted from the MRAI.
Status of this Memo Status of this Memo
This Internet-Draft is submitted in full conformance with the This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79. provisions of BCP 78 and BCP 79.
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 April 15, 2011. This Internet-Draft will expire on March 23, 2012.
Copyright Notice Copyright Notice
Copyright (c) 2010 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
carefully, as they describe your rights and restrictions with respect carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as the Trust Legal Provisions and are provided without warranty as
skipping to change at page 3, line 18 skipping to change at page 3, line 18
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119]. document are to be interpreted as described in [RFC2119].
2. Background 2. Background
The Minimum Route Advertisement Interval (MRAI) timer is specified in The Minimum Route Advertisement Interval (MRAI) timer is specified in
[RFC4271]. This timer acts to rate-limit updates, on a per- [RFC4271]. This timer acts to rate-limit updates, on a per-
destination basis. [RFC4271] suggests values of 30s and 5s for this destination basis. [RFC4271] suggests values of 30s and 5s for this
interval for eBGP and iBGP respectively. The MRAI must also be interval for eBGP and iBGP respectively. The MRAI must also be
applied to withdrawals according to RFC4271, a change from the applied to withdrawals according to RFC4271, a change from the
earlier [RFC1771]. earlier RFC1771.
The MRAI timer has a significant effect on the convergence of BGP, in The MRAI timer has a significant effect on the convergence of BGP, in
terms of convergence time, the number of messages, amongst other terms of convergence time, the number of messages, amongst other
metrics. The optimum value for this timer is hard to estimate, never metrics. The optimum value for this timer is hard to estimate, never
mind calculate and will differ between networks, and probably even mind calculate and will differ between networks, and probably even
different subsets of the same network. different subsets of the same network.
3. Revision 3. Revision
The suggested default values for the The suggested default values for the
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4. IANA Considerations 4. IANA Considerations
There are no requests made to IANA in this document. There are no requests made to IANA in this document.
5. Security Considerations 5. Security Considerations
This document raises no new security considerations. This document raises no new security considerations.
6. Normative References 6. Normative References
[RFC1771] Rekhter, Y. and T. Li, "A Border Gateway Protocol 4 [RFC4271] Rekhter, Y., Li, T., and S. Hares, "A Border Gateway
(BGP-4)", RFC 1771, March 1995. Protocol 4 (BGP-4)", RFC 4271, January 2006.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997. Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC4271] Rekhter, Y., Li, T., and S. Hares, "A Border Gateway
Protocol 4 (BGP-4)", RFC 4271, January 2006.
Author's Address Author's Address
Paul Jakma Paul Jakma
School of Computing Science, Uni. of Glasgow School of Computing Science, Uni. of Glasgow
Sir Alwyn Williams Building Sir Alwyn Williams Building
University of Glasgow
Glasgow G12 8QQ Glasgow G12 8QQ
UK Scotland
Email: paulj@dcs.gla.ac.uk Email: paulj@dcs.gla.ac.uk
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