What to expect when ASA AIP SSM reaches maximum throughput?

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Mar 16th, 2009
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I'm just curious what happens to traffic when you have an IPS module in an ASA and it reaches the maximum throughput?

Does it allow the traffic & only inspects what it can handle? Or does it "fail" and then either allows all the traffic or block based on "fail-open" or "fail-close" configuration?



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marcabal Thu, 03/19/2009 - 14:34
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When the sensor (SSM or any other sensor) is oversubscribed and the sensor is monitoring Inline, then a portion of the traffic will be Dropped.

The traffic will not be allowed through if it has not been inspected.

The "fail-open", "fail-close", and "bypass" are not relevant when talking about over subscription.

The only time the "fail-open", "fail-close", or "bypass" configurations comes into play is if the sensor can not do ANY analysis (either a failure, or an upgrade in progress).


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