Hi,

We have been operating a in-band NAC system for about 3 years now. All 
good till this week. NAC users are intermittently losing L2 network 
access for about a minute at a time. This is happening on 5 or 10 minute 
intervals so it looks like a MAC learning issue.

We have a fairly standard setup 2 x CAS connected to to 4506 switches in 
an in-band configuration. This is often connected to a high CPU load on 
the switches (but not always) but connections thru these switches that 
don't use NAC are rock solid.

Peter.

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