A flow table may include a table-miss flow entry, which renders all Match Fields wildcards (every field is a match regardless of value) and has the lowest priority (priority 0). The Match Fields component of a table entry consists of the following required fields:
Ingress Port: The identifier of the port on the switch where the packet arrived. It may be a physical port or a switch-defined virtual port.
Ethernet Source and Destination Addresses: Each entry can be an exact address, a bitmasked value for which only some of the address bits are checked, or a wildcard value (match any value).
IPv4 or IPv6 Protocol Number: A protocol number value, indicating the next header in the packet.
IPv4 or IPv6 Source Address and Destination Address: Each entry can be an exact address, a bitmasked value, a subnet mask value, or a wildcard value.
TCP Source and Destination Ports: Exact match or wildcard value.
User Datagram Protocol (UDP) Source and Destination Ports: Exact match or wildcard value.
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