As I recall MLT in Avaya is an LACP based aggregation. So I believe this will work across v-wire similar to how a Cisco LAG is connected.
Assuming a two port LAG you would create two v-wire using the same two zones on each v-wire
Then you connect switch stack A/B ports to the "trust" side of v-wire 1 & v-wire 2
Then connect switch stack C/D ports to the "untrust side of v-wire 1 & v-wire 2
The switches will behave as if they are directly connected not seeing the PA.
the traffic will be visible to the PA on the v-wire interfaces and you can create your rules as in any other v-wire deploy.
You could also add more v-wire and ports as needed up to the traffic capacity of the Palo Alto.
This document describes the similar situation with Cisco switches.
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