Re: [Pce] A New Internet-Draft on Advertising of inter-AS TE links

[Zhang Renhai <zhangrenhai@huawei.com>]

Hi, Greg

Thanks a lot for your question.
See inline please.

Dear Zhang,
I have couple questions related to Link ID of inter-AS link. According to the document it is the Router ID of Remote ASBR. 
[ZRH]Yes, and this can be easily got by manual configuration in the local ASBR.

My question:
- as I understand the mechanism of how TE information for links R6-R9 and R8-R10 is populated into R5's TE DB is outside the scope of this document. I this mechanism is not IGP but EGP (BGP), then what is the benefit to introduce new LSA in IGP (OSPF) and not use exisitng mechanisms.

[ZRH]I think BGP could also be another alternative especially for PCE scenario, but it's not very applicable to per-domian method because the inter-AS TE information may be needed throughout the local AS in case that the path computation function is distributed among LSRs in the local AS, and BGP can hardly advertise the TE information among those LSRs if BGP sessions are not established between the ASBR and those LSRs. So IGP extension is considered in this draft.

We have submitted the revised version of this draft, hoping make the problem statement more clear, and relax the use of type 11 opaque lsa, also allow Type 10 lsa (by which the advertising scope is an area of OSPF).
http://www.ietf.org/internet-drafts/draft-chen-ccamp-ospf-interas-te-extension-01.txt

Cheers,
Zhang Renhai


Regards,
Greg

PS. I think that OSPF WG needs to be informed as well.

-----Original Message-----
From: Zhang Renhai [mailto:zhangrenhai@huawei.com]
Sent: Tuesday, January 30, 2007 7:38 PM
To: ccamp@ops.ietf.org; pce@ietf.org
Subject: [Pce] A New Internet-Draft on Advertising of inter-AS TE links


Hi, allWe have just submitted the following draft in which we describe some problemsin inter-AS TE scenarios and the corresponding OSPF extension is introduced.PCE environment is also considerd in this I-d so I'd also like pce working groupto pay attention to it.we'd highly appreciate your comments.Thanks a lot,Zhang Renhai & Mach A New Internet-Draft is available from the on-line Internet-Drafts 
directories.


Title : OSPF Extensions in Support of Inter-AS (G)MPLS TE 
Author(s) : M. Chen, R. Zhang
Filename : draft-chen-ccamp-ospf-interas-te-extension-00.txt
Pages : 9
Date : 2007-1-30

   This document describes extensions to the OSPF to support inter-AS 
   Traffic engineering (TE). It defines OSPF extensions for the flooding 
   of inter-AS links information which can be used to perform inter-AS 
   path computation. 


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