This holds the specific 16-bit Ethernet Type value this rule matches against -- such as 0x0800 for IPv4 or 0x0806 for ARP -- active only when cienaCesAclRuleMatchBaseEtype is true for this row. An admin sets this to the exact protocol identifier of the traffic they want to isolate, letting a rule target a specific non-IP or IP protocol family directly by its wire-level type field. For example, setting this to 0x88CC (LLDP) alongside a permit action would build a rule explicitly allowing LLDP discovery frames through an otherwise restrictive port, ensuring topology-discovery traffic isn't inadvertently blocked by broader IP-focused rules.