topic Re: Sessions aging , scaling , app tricking etc in General Topics

Sessions aging , scaling , app tricking etc

sunilsadanandan — Mon, 29 Apr 2013 10:43:40 GMT

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

Re: Sessions aging , scaling , app tricking etc

UhMayYeah — Tue, 30 Apr 2013 05:17:57 GMT

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.

Re: Sessions aging , scaling , app tricking etc

UhMayYeah — Tue, 30 Apr 2013 05:22:13 GMT

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.