Currently a PTP configuration has been setup using Linux4ptp. While eavuluating Ie 4000 switch , enabling it with a dot1as profile , we get a good sync value but a very high RMS on the slave side . The very same setup when tested against another switch with same 802.1a capabilities has a very low rms variation on the slave side. We are unable to understand the reason behind it ?
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Hello we are trying to use the CISCO , IE 4000 to switch communication between master nodes and slave nodes . For testing PTP we are using link ptp version 1.8
We have some issues in making the time sync work and to see the functionality of the 802.1 ptp profile.
We have done the following tests
Master node to the Slave node without the CISCO switch ( It seems to work OK with a offset of +/- 20 ns)
CISCO switch as master to two slaves , synchronization works but we with a big offset of +/- 500 ns
We use another node as master, communicating to two slave nodes via the CISCO switch. We seem to loose the synchronization between the switch and slave node but the synchronization between master node and CISCO works. Also , the MASTER capable ports on the CISCO switch don’t seem to have 802.1AS capability.
What could be the reason for lack of synchronization? And why do the ports loose the PTP configuration – Is it possible to configure the switch in another configuration to reduce the synchronization error ?
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