I-D Action:draft-dickson-idr-second-best-backup-01.txt

A New Internet-Draft is available from the on-line Internet-Drafts directories.

	Title           : Enhanced BGP Capabilities for Exchanging Second-best and Back-up Paths
	Author(s)       : B. Dickson
	Filename        : draft-dickson-idr-second-best-backup-01.txt
	Pages           : 26
	Date            : 2008-02-25

This Internet Draft describes an enhanced way to exchange prefix
information, to permit multiple copies of a prefix with different
paths to be announced and withdrawn.

This negotiated capability provides faster local (inter-AS) and
global (intra-AS) convergence, reduces path-hunting, improves route-
reflector behaviour, including eliminating both persistent
oscillations and BGP "wedgies".

Additional prefix instances have new optional BGP attributes, to
control path selection.

Withdrawl of prefixes will require new attributes to disambiguate
prefix instances.

Benefits are seen both when deployed intra-AS, and on inter-AS
peering.Author's Note

This Internet Draft is intended to result in this draft or a related
draft(s) being placed on the Standards Track for idr.

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 [5].

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