Hi Yaakov and all, If GAL is used, the encapsulation is different from the current one. It may be: GAL -> Forward label -> ACH.... Then the compatibility should be considered: 1. It would be possible PE will treat "forward label" as ACH header. 2. It would be best if there is a way to identify PTP message type only through PTPA.
If the encapsulation is GAL -> ACH -> Forward label, I think it is also impossible. BR Lizhong Stewart and all, Indeed, the limited number of reserved labels was the main drawback of the "reserved label" approach when I first raised it. The other possibility of this sort was a special CoS bit combination, but there are no universally defined CoS (yet). So, are we back to the GAL ? If so, there are still at least 4 options : 1) define a new protocol type (plenty of openings in THAT registry!) 2) put 1588 packet into an ACH TLV 3) use IPv4 protocol type with 1588 over UDP/IP but mark it in some other way (e.g., reserved field) 4) define a new first nibble (0010 ?) <ugh!> Y(J)S -----Original Message----- From: tictoc-bounces at ietf.org [mailto:tictoc-bounces at ietf.org] On Behalf Of Stewart Bryant Sent: Friday, July 16, 2010 00:04 To: tictoc at ietf.org Subject: Re: [TICTOC] FW: 1588 over MPLS draft Reserved labels are very much a utility of last resort. There are only 16 of them to last us the whole life of MPLS, so that should only be used when there is no other method. It is not a good idea to probe the network to discover a capability, it is far better to know it through a property of the routing protocol. That way you can match the path to the set of capable LSRs. Stewart _______________________________________________ TICTOC mailing list TICTOC at ietf.org https://www.ietf.org/mailman/listinfo/tictoc -------------------------------------------------------- ZTE Information Security Notice: The information contained in this mail is solely property of the sender's organization. This mail communication is confidential. Recipients named above are obligated to maintain secrecy and are not permitted to disclose the contents of this communication to others. This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the originator of the message. Any views expressed in this message are those of the individual sender. This message has been scanned for viruses and Spam by ZTE Anti-Spam system.
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