Hi Lizhong,
> > You can only ensure that 1588aware LSRs will not do ECMP on PTP > LSPs. What if we have a non-1588aware LSR in the path? [Lizhong] All the LSRs and LERs along PTP LSP MUST be 1588aware, right?
In an ideal world Yes, all routers would be 1588aware. However, this being far from an ideal world, you can always have some LSRs that are not draft-ietf-tictoc-1588overmpls aware. You will note that this draft also has some text on the non 1588aware LSRs. These LSRs could be doing ECMP and without an entropy label, may cause PTP messages to be load distributed across different paths.
>The head end > when setting up the RSVP path would know this (by inspecting the IS- > IS or OSPF TE info) and could in such cases make use of the Entropy > label to ensure that all PTP packets follow the same path. [Lizhong] How to use entropy label to ensure all PTP packets follow the same path?
Using an entropy label will ensure that all PTP packets in one direction follow the same path.
If there is entropy label, it is possible that the forward and reverse path would be different.
Since LSPs are unidirectional there is no guarantee that the two paths would be symmetrical. So this really is an issue orthogonal to the use of entropy labels for carrying PTP traffic.
We should probably add some text in the draft that says that the two paths must be symmetrical.
Cheers, Manav
>This is > one scenario where i think we may want to use Entropy labels. > > Cheers, Manav > > From: [email protected] [mailto:[email protected]] > Sent: Tuesday, January 18, 2011 6.03 PM > To: Bhatia, Manav (Manav) > Cc: [email protected] > Subject: Re: [TICTOC] Transporting PTP messages (1588) over MPLS Networks > > Hi Manav, > In section 8 ECMP, since it is said PTP LSPs and PWs MUST NOT be > subject to ECMP, why in section 5.2 the encapsulation of figure 2 > has entroy label? I am a bit confused. > > Regards > Lizhong > > > > ---------------------------------------------------------------------- > > > > Message: 1 > > Date: Sat, 15 Jan 2011 16:25:59 +0530 > > From: "Bhatia, Manav (Manav)" <[email protected]> > > Subject: [TICTOC] Transporting PTP messages (1588) over MPLS Networks > > To: "[email protected]" <[email protected]> > > Message-ID: > > <[email protected]. > > alcatel-lucent.com> > > > > Content-Type: text/plain; charset="us-ascii" > > > > Hi, > > > > We have posted a revised version of draft-davari- > > tictoc-1588overmpls-01 and would appreciate a feedback from the WG. > > > > The draft is available here: > > http://www.ietf.org/id/draft-davari-tictoc-1588overmpls-01.txt > > > > Cheers, Manav > > > > -- > > Manav Bhatia, > > IP Division, Alcatel-Lucent, > > Bangalore - India > > > > > > > -------------------------------------------------------- > 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. -------------------------------------------------------- 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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