This article will explain using which protocol we can transmit LACP and other control plane stuff transparently over vlan.

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With Layer 2 protocol tunneling (L2PT) enabled, Juniper Networks Ethernet routers and switches can send Layer 2 protocol data units (PDUs) across the network and deliver them to devices that are not part of the local broadcast domain. This feature is useful when you want to run Layer 2 protocols on a network that includes switches located at remote sites that are connected across a service provider network.

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You can also use L2PT to tunnel protocols between two locally connected user-to-network interfaces (UNIs) in the same broadcast domain, but in that case, the protocol packets are simply flooded in the VLAN instead of being rewritten with the tunnel MAC address.

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L2PT works by encapsulating Layer 2 PDUs, tunneling them across a service provider network, and decapsulating them for delivery to their destination switches.

EX Series and QFX Series Switch Support for Layer 2 Protocol Tunneling. Please refer below link for more details.

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https://www.juniper.net/documentation/us/en/software/junos/multicast-l2/topics/topic-map/layer-2-protocol-tunneling.html

L2PT Protocols Supported on EX Series and QFX Series Switches are listed in above article. Please note that if you enable L2PT for untagged LACP packets, do not configure Link Aggregation Control Protocol (LACP) on the corresponding access interface.

Layer 2 Protocol Tunneling (L2PT) | Junos OS | Juniper Networks