Inter-Domain Routing P. Jakma
Internet-Draft Sun Microsystems
Expires: June 18, 2009 December 15, 2008
Revisions to the BGP 'Minimum Route Advertisement Interval'
draft-ietf-idr-mrai-dep-00
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Abstract
This document revises the specification of the BGP MRAI timer, by
deprecating the previously recommended values and by allowing for
withdrawals to be exempted from the MRAI.
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Table of Contents
1. Requirements Language . . . . . . . . . . . . . . . . . . . . . 3
2. Background . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Revision . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 3
5. Security Considerations . . . . . . . . . . . . . . . . . . . . 3
6. Normative References . . . . . . . . . . . . . . . . . . . . . 3
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 4
Intellectual Property and Copyright Statements . . . . . . . . . . 5
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1. Requirements Language
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 [RFC2119].
2. Background
The Minimum Route Advertisement Interval (MRAI) timer is specified in
RFC4271 [BGP]. This timer acts to rate-limit updates, on a per-
destination basis. [BGP] suggests values of 30s and 5s for this
interval for eBGP and iBGP respectively. The MRAI must also be
applied to withdrawals according to RFC4271, a change from the
earlier RFC1771.
The MRAI timer has a significant effect on the convergence of BGP, in
terms of convergence time, the number of messages, amongst other
metrics. The optimum value for this timer is hard to estimate, never
mind calculate and will differ between networks, and probably even
different subsets of the same network.
3. Revision
The suggested default values for the
MinRouteAdvertisementIntervalTimer given in RFC4271 [BGP] are
deprecated. Implementations SHOULD provide a means to allow
operators to choose values appropriate to their requirements, on a
per-peer and per-AFI/SAFI basis. Implementations MAY exempt
withdrawals from the MRAI timer.
4. IANA Considerations
There are no requests made to IANA in this document.
5. Security Considerations
This document raises no new security considerations.
6. Normative References
[BGP] Rekhter, Y., Li, T., and S. Hares, "A Border Gateway
Protocol 4 (BGP-4)", RFC 4271, January 2006.
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[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", RFC 2119, BCP 14, February 2001.
Author's Address
Paul Jakma
Sun Microsystems
Springfield
Linlithgow, West Lothian EH49 7LR
Scotland
Phone: +44 1506 673150
Email: paul.jakma@sun.com
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