Precision Time Protocol (PTP), "ptp vlan", and PRP rings with Trunked VLANs

[BRIAN SEKLECKI]

All:

    My clients secure their different PLC environments with VLAN Segmentation

   PTP can only operate on a single VLAN, normally the untagged native VLAN on a trunk.

   PTP operates by clients joining a multicast group, correct?

    So if PTP is bound to a specific VLAN, but all the links to a PRP ring switches are trunk ports, even if the 'ptp vlan' matches the the 'switchport trunk native vlan', then:

  PTP clients on access ports for a Tagged VLAN on the RPR switches wont be able to receive PTP traffic, correct?

  Any ideas how to solve?  Have the Layer3 SVI/BVI on the layer3 distribution switches for the Client/Tagged VLANs do static IP IGMP Joins ?

Or turn on PIM to route Multicast between VLAN SVIs/BVIs on layer3 distribution switches?

[BRIAN SEKLECKI]

All:

To answer my own question, with regards to making PTP available on Multiple VLANs on the Stratix 5400 aka Cisco IE4000/IE5000. This is not possible. Even if you turn on Multicast routing, and even if you seutp static Multicast group joins, TCPDUMP / Wireshark shows that PTP traffic generated by the NTP-to-PTP gateway feature sets the Muticast IP Packets to TTL=1, preventing them from being Layer3 switched/routed.