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'qos trust extend' command on 4500E causes Alcatel phones to reboot

Hi, We have autoqos configured on our 3560G access layer switches, when entering the 'qos trust extend' command on the 4500 interfaces which connect to the access layer switches this caused out Alcatel Phones to reboot.

 

I thought that this command just trusts the DSCP/CoS markings but obviously there is something else going on.

 

Any advice would be appreciated.

 

Thanks,

 

Paul

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