You need to specify what you mean by "recover the time correctly." Everytime you pass through a piece of equipment that is not timing aware, you introduce noise into the timing signal. More hops, more noise. Noise reduces synchronization accuracy.
Kevin Gross +1-303-447-0517 Media Network Consultant AVA Networks - www.AVAnw.com <http://www.avanw.com/>, www.X192.org On Fri, Jul 19, 2013 at 7:19 AM, Shahram Davari <[email protected]> wrote: > Hi Stewart, > > Not necessarily. It is ok if some of the routers in the path are not > timing aware. That is the whole idea. We have tested cases in which 5-7 > hops are not 1588 aware and still we can recover the time correctly. > > Regards, > Shahram > > > On Jul 19, 2013, at 3:33 AM, "Stewart Bryant" <[email protected]> wrote: > > > On 19/07/2013 09:11, Bhatia, Manav (Manav) wrote: > >> Hi Sasha, > >> > >>> 1) reserved label is not backward compatible with existing routers. One > >>> of the requirements is that routers that are not PTP aware can just > >>> switch the packet normally. Using a reserved label can't achieve this > >>> requirement, since routers that don't understand it will drop it or > >>> sent it to CPU. > >>> [[Sasha]] Is not this concern applicable to any new reserved label? > >>> And routers that use network processors as forwarding engines could > >>> easily overcome this issue by upgrading their microcode. > >>> But I agree that this is a valid concern. > >> This is a huge concern because not all routers use network processors > that can be reprogrammed. > >> > >> The current solution works with any router that can set up an MPLS path. > > Really? > > > > Surely the LSR needs to know that on seeing a label in the FEC it needs > > to timestamp the packet. > > > > Stewart > > _______________________________________________ > > TICTOC mailing list > > [email protected] > > https://www.ietf.org/mailman/listinfo/tictoc > > > > _______________________________________________ > TICTOC mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/tictoc >
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