Sessions aging , scaling , app tricking etc

[sunilsadanandan]

Hi,

Could someone briefly describe the significance of these values shown in the output for "show sessions info" and how they may be tweaked from a performance perspective ?

-

Session accelerated aging:                       True

  Accelerated aging threshold:                   80% of utilization

  Scaling factor:                                2 X

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Session setup

  TCP - reject non-SYN first packet:             True

  Hardware session offloading:                   True

  IPv6 firewalling:                              True

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Application trickling scan parameters:

  Timeout to determine application trickling:    10 secs

  Resource utilization threshold to start scan:  80%

  Scan scaling factor over regular aging:        8

Kind Regards,

Sunil tricking

[UhMayYeah]

Accelerated aging threshold and Scaling Factor

Once the session table reaches the Accelerated Aging Threshold (% full), the scaling factor will be applied to all sessions.

The session's idle time will be calculated as the actual idle time * scaling factor.

For example, if a scaling factor of 10 were used, a session that would normally time-out after 3600 seconds will instead time-out after 360 seconds.

Accelerated aging is performed across the full session table.

[UhMayYeah]

Application trickling

Is basically a resource-protection mechanism. As application-layer processing is resource-intensive, when resource (packet buffer etc) utilization exceeds configured threshold, software will start scanning sessions and if a session has been inactive longer than the trickling threshold configured, the buffering resource occupied by this session will be freed.