Cisco 4500M Software Manual page 575

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Configuring NetFlow Statistics Collection

Prefix Aggregation Scheme

This is an example of a prefix aggregation cache configuration:

ip flow-aggregation cache prefix

mask source minimum 24

mask destination minimum 28

In this example, assume the following configuration:

ip route 118.42.20.160 255.255.255.224 110.42.13.2

ip route 122.16.93.160 255.255.255.224 111.22.21.2

Both routes have a 27-bit subnet mask in the routing table on the switch.

Flows travelling from the 118.42.20.160 subnet to the 122.16.93.160 subnet whose source IP addresses

match with a mask of 27 bits and whose destination IP addresses match with a mask of 28 bits are

aggregated together in the cache statistics.

Destination-Prefix Aggregation Scheme

This is an example of a destination-prefix aggregation cache configuration:

ip flow-aggregation cache destination-prefix

mask destination minimum 32

Source-Prefix Aggregation Scheme

This is an example of a source-prefix aggregation cache configuration:

ip flow-aggregation cache source-prefix

mask source minimum 30

NetFlow Configuration Examples

Software Configuration Guide—Release 12.2(25)EW