Hello Quintin,
I have following comments - For Pre-computed Backup Core Tree 1) Is the Backup tree, the next Best core-tree [MCT or SPT]? 2) How path-diverse should the Backup tree be? We may need to support all re-optimization scenarios similar to P2MP Intra-domain cases [explained in draft-ietf-pce-pcep-p2mp-extensions]. Thanks & Regards, Dhruv Huawei Technologies Co.,Ltd. Bangalore, India **************************************************************************** *********** This e-mail and attachments contain confidential information from HUAWEI, which is intended only for the person or entity whose address is listed above. Any use of the information contained herein in any way (including, but not limited to, total or partial disclosure, reproduction, or dissemination) by persons other than the intended recipient's) is prohibited. If you receive this e-mail in error, please notify the sender by phone or email immediately and delete it! -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Quintin Zhao Sent: Tuesday, December 15, 2009 2:46 AM To: [email protected] Subject: [Pce] Inter-domain-p2mp-procedures Hello PCE'rs, I would like to follow-up on some discussions from our PCE WG session last month. Specifically regarding Dajiang's failure and recomputation observations on our draft. We are very interested to hear comments regarding the need for computing secondary paths in the event of failure. Currently our thinking is to recompute the sub-tree based in the domain where the failure has occurred. In this case we would not need to perform a recalculation of the entire tree. We could also recompute the entire tree, and avoid the failed areas, as long as the TED has the updated topology. Realistically one might have a backup core tree pre-computed so you can switch over in the event of failure. There are also other considerations. Would a partial recomputation provide a "worse" SPT or MCT tree, or would a full tree recomputation provide a "better" SPT or MCT? I can think of scenarios for both a partial and full recomputation, so perhaps we need to implement both but allow the PCC to decide when to issue a partial or full recomputation based on some criterion. Thanks, Quintin _______________________________________________ Pce mailing list [email protected] https://www.ietf.org/mailman/listinfo/pce
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