We've been buying the C92348GC-X as part of our solution, to replace the Nexus 3048-TP which is now obsolete. Originally, the 92348 supported PTP and was significantly cheaper than the 3048 which was an added bonus. However, after version 10.0 Cisco decided to remove support for PTP in the firmware because it was 'too expensive' (TAC's words, not mine) for the processor in the 92348.
We've been getting around this by downgrading all the switches to version 9.3 of the firmware, which allows us to configure PTP again and have the switch act as a boundary clock. The fact that we have to run an old firmware version bothers me, however so I've got another one on the bench and I'm trying to make it not act as a clock at all, just as a basic switch. I can't figure out how to get the PTP multicast packets to pass through the switch
I've got a simple test bench, with a Safran (Spectracom) PTP Grandmaster plugged into one port, and a Linux machine running ptp4l on the other. All ports are configured on vlan 1. The ptp4l installation does not see the grandmaster (and tries to become one itself.) If i switch out this 92348GC-X with another that's been downgraded, and I enable the ptp feature (and set `ptp vlan 1` on all ports) then the ptp4l installation sees the GM straight away and becomes a slave.
So with Cisco removing the ptp feature from the firmware, how can I have the PTP traffic pass through like it would in an unmanaged switch?
Thanks
