Cisco Catalyst 4500 series Administration Manual page 1600

Non-VSS Environment
Supervisor Engine 8-E, Supervisor Engine 7-E, Supervisor Engine 7L-E, and Catalyst 4500X do not
11.
support:
Packet length or TTL options are not supported with the ToS option.
12.
The configuration of the flow exporter does not support the option output features.
13.
Flow aging in flow cache is controlled through active and in-active timer configuration. The
14.
minimum for active and in-active aging timers is 5 seconds. The timers must be in units of 5 seconds.
Note
15. First and Last-seen flow timestamp accuracy is within 3 seconds.
2048 Flow monitors and records are supported.
16.
When TTL is configured as a flow field, the following values are reported for a given packet TTL value.
Table 65-4
17. Cisco TrustSec (CTS) fields are supported. These fields use Netflow collector to monitor and
troubleshoot the CTS network, and to segregate traffic based on source group tag (SGT) values.
Table 65-4
Packet TT Value
0
1
2-10
11-25
26-50
51-100
100-150
150-255
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
65-10
– predefined records like traditional routers (record netflow ipv4 original-input)
flow based sampler.
–
Flows in the hardware table are deleted after 5 seconds of in-activity irrespective of the active
or in-active timer configuration values. This allows you to create new hardware flows quickly.
lists the packet TTL and reported values.
– When configuring the source group tag (collect flow cts source group-tag), note the following:
The system copies the packets to software before it retrieves the CTS field. A large number of
flows mean that a large number of packets are copied to the software, possibly affecting CPU
performance.
The maximum number of (unique) hosts allowed in the switch (IP addresses) is 12,000.
In case of burst packets, the software may not be able to retrieve the CTS field because the
software queue is throttled.
When configuring the destination group tag (collect flow cts destination group-tag), note that
–
this CTS field value is collected only if you have already configured an IP-to-SGT mapping.
When configuring switch-derived source group tags (collect flow cts switch derived-sgt), note
–
that the switch derives this value locally.
TTL Map: TTL Configured
Reported Value
0
1
10
25
50
100
150
255
Chapter 65 Configuring Flexible NetFlow
OL_28731-01