I've done searches and believe the error is as follows, but if anyone can agree or disagree with that it would be most usefull, as unfortunately this network is now live, so I have to be somewhat delicate on config changes!
Symptoms: A router may permanently pause with the following error message:
%ALIGN-1-FATAL: Illegal access to a low address-box crash
Conditions: This symptom is observed on a Cisco router when there is active traffic on the subinterface and the VLAN encapsulation is changed.
Workaround: Shut down the subinterface before changing the encapsulation, and then reload the subinterface after the encapsulation change is complete."
Re: 7206VXR router and VLAN Illegal access to a low address erro
Your main interface should have no config apart from possibly a description and a no shut. This has to do with the fact that you want to "divide" your interface into subs using vlan encapsulation (ISL / Dot1q) which then turns this interface into a controller for the channel if you will. Change your config to something like this :
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