Tue Feb 21, 2023 10:52 pm
You can try MiCLK from RAD. It almost same device as OSA5401, with WEB interface and about 30% cheaper. But it have some think, we go to use ADVA - the MiCLK doesn't begin operate as GM, before it will be once locked. ADVA can operate on its Stratum 3 clock.
Finally, i have setup CRS326-24S+2Q+ as fronthaul 5G SA base station with PTP support. The 4 RU's operates MIMO 4x2 (4T2R) with DU synced with ADVA OSA5401 works fine.
The switch setup is not clear as other switches, but it possible. Some issues with PTP implementation:
1. L2 GM packets not isolated in bridge. So if PTP destination is forwardable mac (01-1B-19-00-00-00), the all PTP packets spread to all bridge ports, and slave devices also see GM packets, and could choose GM. If i change PTP destination to non-forwardable mac (01-80-C2-00-00-0E), the announce and sync packets not forwarded, but switch send delay_request to (01-1B-19-00-00-00) and ADVA also answered to (01-1B-19-00-00-00), so these packets also spread to all ports. There are no possibilities to add VLAN to PTP traffic, and switch rules also doesn't work for me. The only way i found - create dedicated bridge for GM.
2. The PTP slaves ports also not isolated, so all multicast PTP traffic pass thru all PTP ports. This is less problem, but usually BC switches isolate every PTP traffic by its port.
3. The PTP implementation have one bug: when GM in already locked switch suddenly change TOD to huge value (hours, month, years), the switch newer will come to sync state. These can happen when GPS signal of GM is lost, GM lost power, etc.... If Mikrotik use ptp4l, it better to add step_threshold 0.002 to the setting.
4. I'm really waiting for 100G Mikrotik switches with PTP support. The 10G already go out from communication segment.
Maybe anyone could help me with setting routing to PTP bridge? The GM have static IP from same management network, and i need get access to SSH, TELNET, logs and NTP of GM.
Thanks!
Last edited by
dgel27 on Tue Feb 21, 2023 11:04 pm, edited 2 times in total.