On Sun, 2013-12-01 at 10:57 +0100, Delio Brignoli wrote: > On Dec 1, 2013, at 7:48 AM, Richard Cochran <[email protected]> wrote: > > > On Sat, Nov 30, 2013 at 09:46:46PM +0100, Delio Brignoli wrote: > >> > >> Yes, but... 802.1AS does not have a different state machine for > >> slave-only operation, instead a non grand-master capable time-aware > >> system has a property1 value of 255 (see second paragraph of section > >> 8.6.2.1). Additionally, according to point f.5 of section > >> 10.3.12.1.4 updtRolesTree(), if the current portPriorityVector is > >> the portPriorityVector of the time-aware system (i.e. we have not > >> yet received an announce message with better portPriorityVector) the > >> portRole should be set to MasterPort which makes the txAnnounce > >> method reachable. > > > > This brings to mind two questions. > > > > 1. Does omitting the announce message from a slave only node cause you > > interoperability problems? > > Yes, we are failing interoperability tests without this fix. > > > 2. What is the point of the slave only node's announce messages? > > > > [ The announce messages will not affect the outcome of the peer's > > BMC election, except to make it slower. ] > > > Knowing the node exists and it is a slave I guess... >
I believe it's in order to know that the node is asCapable.. I know at least one switch which will ignore a port unless it receives an announce from it that indicates it's asCapable... Regards, Jake > >From point i.4 of section 7.5 "Differences between gPTP and PTP": "all > >time-aware systems are required to participate in best master selection > >(even if it is not grandmaster capable)". > > Thanks > -- > Delio > ------------------------------------------------------------------------------ Rapidly troubleshoot problems before they affect your business. Most IT organizations don't have a clear picture of how application performance affects their revenue. With AppDynamics, you get 100% visibility into your Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! http://pubads.g.doubleclick.net/gampad/clk?id=84349351&iu=/4140/ostg.clktrk _______________________________________________ Linuxptp-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/linuxptp-devel
