Specifying Netflow Table Ip Entry Fast Aging Time And Packet Threshold Values; Setting The Minimum Statistics Flow Mask - Cisco WS-X6066-SLB-APC - Content Switching Module Software Manual

Configuring NetFlow Statistics
Specifying NetFlow Table IP Entry Fast Aging Time and Packet Threshold
Values
IPX entries do not use fast aging.
Note
To minimize the size of the NetFlow table, enable IP entry fast aging time. The IP entry fast aging time
applies to NetFlow table entries that have no more than pkt_threshold packets routed within
fastagingtime seconds after they are created. A typical NetFlow table entry that is removed is the entry
for flows to and from a Domain Name Server (DNS) or TFTP server; the entry might never be used again
after it is created. Detecting and aging out these entries saves space in the NetFlow table for other data
traffic.
The default fastagingtime value is 0 (no fast aging). You can configure the fastagingtime value to 32, 64,
96, or 128 seconds. Any fastagingtime value that is not configured exactly as the indicated values is
adjusted to the closest one. You can configure the pkt_threshold value to 0, 1, 3, 7, 15, 31, or 63 packets.
If you need to enable IP entry fast aging time, initially set the value to 128 seconds. If the NetFlow table
remains full, decrease the setting. If the NetFlow table continues to remain full, decrease the normal IP
entry aging time.
Typical values for fastagingtime and pkt_threshold are 32 seconds and 0 packets (no packets switched
within 32 seconds after the entry is created).
To specify the IP entry fast aging time and packet threshold, perform this task in privileged mode:
Task
Specify the IP entry fast aging time and
packet threshold for a NetFlow table
entry.
This example shows how to set the IP entry fast aging time to 32 seconds with a packet threshold of
0 packets:
Console> (enable) set mls agingtime fast 32 0
Multilayer switching fast aging time set to 32 seconds for entries with no more than 0
packets switched.
Console> (enable)

Setting the Minimum Statistics Flow Mask

You can set the minimum granularity of the flow mask for the NetFlow table. The actual flow mask used
will be at least of the granularity specified by this command. For information on how the different flow
masks work, see the
Entering a set mls flow command purges all existing entries in the NetFlow table.
Note
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
13-24
Command
set mls agingtime fast [fastagingtime] [pkt_threshold]
"Flow Masks" section on page
Chapter 13
13-10.
Configuring CEF for PFC2
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