Interleaving over MLPPPoX bundles with multiple links are not supported. However, fragmentation is supported.
To preserve packet order, all packets on an MLPPPoX bundle with multiple links are MLPPPoX encapsulated (monotonically increased sequence numbers).
We do not support multiclass MLPPP (RFC 2686, The Multi-Class Extension to Multi-Link PPP). Multiclass MLPPP would require another level of intelligent queuing in the BB-ISA which we do not have.