Hello, friend!
You can run the dot1ad tpid command to change the global 802.1ad Ethernet protocol type. The default 802.1ad Ethernet protocol type is 0x88a8.
Example: To set the 802.1ad Ethernet protocol type of the system, do as follows:
huawei(config)#dot1ad tpid
{tpid<H><0x600,0xffff>}:0x9100
Command:
dot1ad tpid 0x9100
Thanks!