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Freeradius Authentication not working when AP is given a reboot

Dear All, I have been working on this lab. The blue part of the network represents GNS3 emulated part and green part is real part. Following are key components in network.
I am using Centos 7 as Freeradius.
I am using Cisco e4200 with DDWRT as access points. 
I am using Cisco 2950 switch as real switch connected with APs and also connected with GNS3 switches using two NICs.

I am using Cisco layer 3 switches in GNS3 
I have given the IP address of Freeradius in Access Points. It works with authentication, but when I reboot my Access Point the FreeRadius stops the authentication until I access the AP and press the apply settings button in DDWRT in order to start the authentication. Initially I thought its some problem with DDWRT but when I replaced this Cisco 2950 switch with some netgear switch authentication works really very well even If I reboot AP(It means there is no problem with DDWRT). I thought I might have some problem with Cisco 2950 switch I replaced the switch with another Cisco 3500XL series switch but the problem still exists. Authentication works but when I reboot the AP it stops the authentication and at that point I have to access the AP and press "APPLY SETTINGS" button. 
It looks like there is some problem with my Cisco Switch.  

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