RE: [PCE] Inter-AS PCE Path Sequence Autoexplore

[Vijayanand C - TLS, Chennai.]

Mach, A question about the pce sequence autoexplore I-D.   This method seems to rely on BGP to get the next AS en-route to the destination. BGP may not give all the possible ASes, since based on its decision process and policy it may select only one route to pass on. For ex. If an EBGP speaker gets route for the same prefix from different EBGP peers from different ASes, it may select one of them and advertise to its IBGP peers. (The PCE may not have access to all the alternate routes of the EBGP speaker connecting to all the ASes) But we don't know the TE characteristic of the link connecting with the speaker whos' route was chosen( it may not be TE capable ?). Also, the policy configuration on the EBGP speaker itself may block some inbound routes. So some information is lost here.   Regards, Vijay     -----Original Message----- From: Mach Chen [mailto:[EMAIL PROTECTED] Sent: Tuesday, October 17, 2006 7:19 AM To: [EMAIL PROTECTED] Subject: [PCE] Inter-AS PCE Path Sequence Autoexplore   Hi folks,   We have posted a new I-D http://www.ietf.org/internet-drafts/draft-chen-pce-interas-pce-sequence-autoexplore-00.txt which is about how to explore those PCEs and track their sequence which are engaged in computing an end-to-end path spanning multiple ASes.   Any feed-back and comments would be most welcome.   Best regards,   Mach ·         To: i-d-announce at ietf.org ·         Subject: I-D ACTION:draft-chen-pce-interas-pce-sequence-autoexplore-00.txt ·         From: Internet-Drafts at ietf.org ·         Date: Thu, 12 Oct 2006 15:50:02 -0400 ·         Cc: ·         List-archive: <http://www1.ietf.org/pipermail/i-d-announce> ·         List-help: <mailto:[EMAIL PROTECTED]> ·         List-id: i-d-announce.ietf.org ·         List-post: <mailto:i-d-announce@ietf.org> ·         List-subscribe: <https://www1.ietf.org/mailman/listinfo/i-d-announce>, <mailto:[EMAIL PROTECTED]> ·         List-unsubscribe: <https://www1.ietf.org/mailman/listinfo/i-d-announce>, <mailto:[EMAIL PROTECTED]> ·         Reply-to: internet-drafts at ietf.org A New Internet-Draft is available from the on-line Internet-Drafts directories.       Title                : Inter-AS PCE Path Sequence Autoexplore   Author(s)          : M. Chen   Filename : draft-chen-pce-interas-pce-sequence-autoexplore-00.txt   Pages              : 16   Date                : 2006-10-12      In Inter-AS scenario, as usual, multiple Path Computation Elements    (PCEs) will take part in path computation. [PCE-DISCO-OSPF], [PCE-    DISCO-ISIS],PCE-DISCO-BGP] or some other means can be used to    discover all underling PCEs, but there is lack of solutions to find    out those PCEs and their sequence which are engaged in computing an    end-to-end inter-AS TE LSP.  This document proposes a solution to    identify these PCEs and their sequence which can be used to compute a    TE LSP across multiple ASes.        A URL for this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-chen-pce-interas-pce-sequence-autoexplore-00.txt   To remove yourself from the I-D Announcement list, send a message to i-d-announce-request at ietf.org with the word unsubscribe in the body of the message. You can also visit https://www1.ietf.org/mailman/listinfo/I-D-announce to change your subscription settings.   Internet-Drafts are also available by anonymous FTP. Login with the username "anonymous" and a password of your e-mail address. After logging in, type "cd internet-drafts" and then "get draft-chen-pce-interas-pce-sequence-autoexplore-00.txt".   A list of Internet-Drafts directories can be found in http://www.ietf.org/shadow.html or ftp://ftp.ietf.org/ietf/1shadow-sites.txt   Internet-Drafts can also be obtained by e-mail.   Send a message to:   mailserv at ietf.org. In the body type:   "FILE /internet-drafts/draft-chen-pce-interas-pce-sequence-autoexplore-00.txt".   NOTE:      The mail server at ietf.org can return the document in   MIME-encoded form by using the "mpack" utility.  To use this   feature, insert the command "ENCODING mime" before the "FILE"   command.  To decode the response(s), you will need "munpack" or   a MIME-compliant mail reader.  Different MIME-compliant mail readers   exhibit different behavior, especially when dealing with   "multipart" MIME messages (i.e. documents which have been split   up into multiple messages), so check your local documentation on   how to manipulate these messages.   Below is the data which will enable a MIME compliant mail reader implementation to automatically retrieve the ASCII version of the Internet-Draft. <ftp://ftp.ietf.org/internet-drafts/draft-chen-pce-interas-pce-sequence-autoexplore-00.txt> _______________________________________________I-D-Announce mailing listI-D-Announce at ietf.orghttps://www1.ietf.org/mailman/listinfo/i-d-announce   DISCLAIMER: The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only. 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