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What means "flow mask" in the mls configuration?
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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

Also read
document "Unable to change flowmask" error message on Cisco 6500
document Can I use a bridged IP traffic NetFlow on PFC3A?

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