hi, Brad Paker, thank you for your suggestion. but it may not suitable for my datacenter.
in my ceneter, there are 2 scene.
Scene A: some vlans are layer 3 networks. their gateways are in the X770.
Scene B: some vlans are pure layer 2 networks. so the malg is needed to implement the redundancy. these layer 2 network vlans are across the X770. in fact, there are 8 X670 in my center. they are connected to X770 like topo above. the servers under different X670 may communicate each other and they are in the same vlans.
i've read the EXOS_User_Guide_16_1. it doesn't support vlan with different vlan id by the same vrid. the same vrid just supports the vlan configed different ip.