The protocol status of Eth-trunk is up and there is traffic through the interface; but the protocol status of member interfaces is down, as following(output of "display interface brief):
Eth-Trunk1 up up 0.01% 0.01% 0 0
GigabitEthernet1/1/0 up down 0.01% 0.01% 0 0
GigabitEthernet1/1/1 up down 0.01% 0.01% 0 0
GigabitEthernet1/1/4 up down 0.01% 0.01% 0 0
According to Huawei VRP realization, there are servral rules to define the protocol status of Ethernet interface(including physical FE/GE/xGE, subinterface, Eth-trunk):
1) If physical status is down, the protocol status is also down;
2) For L2 interface, If physical status is up, the protocol status is up;
3) For L3 interface, If physical status is up, only when it is configed IP address, the protocol status is up; otherwise, it is down;
4) Specially, If the interface is a L3 Eth-trunk membter, the protocol status is up when its physical status is up(no matter that it is configed IP address or not).
Another reason is that when we config "portswitch" on an Eth-trunk interface, its members are also L3 interface.
In this case, customer configs "portswitch" on Eth-Trunk 1 and doesn't config it on its members; according to rule 3 above, the protocol status of members should be up.
For L3 interfaces, protocol means Layer-3 which means Layer-2 for L2 interfaces.