The following are the configuration guidelines for dot1q-etype configured for dot1q encap port:
Dot1q-etype configuration is supported for all ports - Access, Hybrid and Network ports.
Dot1q-preserve SAPs cannot be configured on dot1q encap ports configured to use ethertype other than 0x8100.
Priority tagged packet received with etype 0x8100 on a dot1q port configured with etype 0x9100 are classified as priority tagged packet and mapped to a dot1q :0 SAP (if configured) and the priority tag is removed.
Priority tagged packets received with etype 0x6666 (any value other than 0x8100) on a dot1q port configured with etype 0x9100 is classified as null-tagged packet and mapped to a dot1q :0 SAP (if configured) and the priority tag is retained and forwarded.
The dot1q-etype is modified only for the dot1q encap port (access/hybrid port). The dot1q-etype cannot be modified on Network ports.
During the non-default dot1q-rvpls and qinq-rvpls, the extra tagged packets is dropped even for an 0x8100 packets on an RVPLS SAP, this is applicable only for network mode (and not access-uplink mode).