By default, the flow keys are: Source IP address, destination IP address, source port, destination port, layer 3 protocol type, ToS byte (DSCP) and input interface. On Cisco Catalyst we speak of the flow mask that define the flow keys.
| Full Interface |
| VLAN |
source IP address |
destination IP address |
L3 protocol |
source port |
destination port |
| Full |
| VLAN |
source IP address |
destination IP address |
L3 protocol |
source port |
destination port |
| Destination-Source-Interface |
| VLAN |
source IP address |
destination IP address |
L3 protocol |
source port |
destination port |
| Source-Only |
| VLAN |
source IP address |
destination IP address |
L3 protocol |
source port |
destination port |
| Destination-Only |
| VLAN |
source IP address |
destination IP address |
L3 protocol |
source port |
destination port |
| Destination-Source |
| VLAN |
source IP address |
destination IP address |
L3 protocol |
source port |
destination port |