I have two RB751U-2HnD (in one subnet) with L2 link between local switch ports. RBs acts as switches in this situation.
It is possible to encrypt this L2 link?
up…
You would need to establish some tunnel for encryption.
Or maybe ipsec directly…
Maybe, it can be done with IEEE 802.1AE?
https://en.wikipedia.org/wiki/IEEE_802.1AE
You can run EoIP over IPsec. Of course the performance will be terrible but you have encryption.