PTP packets can not be forwarded in OLT. Capture as bellow, PTP doesn't belong to BTV, we didn't add igmp user and igmp multicast vlan in OLT. So there doesn't exist multicast forward table in OLT. These PTP will be unknown multicast packets
For unknown multicast packets, there are two solution can be applied.
1: Set policy of unknown multicast handling to transparent based on specified service port.
Multicast-unknown policy service-port index transparent
2: Set default unknown multicast policy from discard to transparent. To be more carefully this will only take effects for service ports which created after this policy being applied. if there were some service ports already existed, we need to delete and recreate.
default-policy service-port multicast-unknown transparent