Subject: [mpls] [Technical Errata Reported] RFC3107 (2319)

From: RFC Errata System <[email-masked]>
Date: Wed, 7 Jul 2010 08:22:12 -0700 (PDT)

The following errata report has been submitted for RFC3107,
"Carrying Label Information in BGP-4".

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You may review the report below and at:
http://www.rfc-editor.org/errata_search.php?rfc=3107&eid=2319

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Type: Technical
Reported by: Bruno Decraene <[email-masked]>

Section: 5

Original Text
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"A BGP speaker should not advertise this capability to another BGP speaker unless there is a Label Switched Path (LSP) between the two speakers."

Corrected Text
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"An eBGP speaker should not advertise this capability to another eBGP speaker unless there is a Label Switched Path (LSP) or layer two interface between the two speakers."

Or just remove completely that sentence.

Notes
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1) :s/BGP/eBGP
An iBGP router should be able to set up an internal BGP session for AFI 1 / SAFI 4 toward a Route Reflector even if the Route Reflector is not capabble of forwarding MPLS packets (This case is even described in the section 2 of the RFC)

2) + layer two interface
If both router are connected by a direct (sub)interface, they should be able to exchange MPLS packets even if there is no LSP between them.

3) Remove the sentence
AFAIK, the point is now better addressed by draft-ietf-idr-bgp-bestpath-selection-criteria-01.txt

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RFC3107 (draft-ietf-mpls-bgp4-mpls-04)
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Title               : Carrying Label Information in BGP-4
Publication Date    : May 2001
Author(s)           : Y. Rekhter, E. Rosen
Category            : PROPOSED STANDARD
Source              : Multiprotocol Label Switching
Area                : Routing
Stream              : IETF
Verifying Party     : IESG