802.1X with Guest vlan support IOS version ???

I don't know, Whitch IOS version support 802.1X with Guest vlan to Catalyst 2950 and 3550 switch
please reply to my question.

Tkank for your help.
Also, Cisco web is explained , except for Catalyst 2950 Standard Image (SI) in IOS 12.1(22)EA3
but I can't understand, My site is using catalyst 2950 SI to 802.1X and guest vlan in IOS image 12.1(22)EA3
ex) TW_14F_A_C2950_32.8#sh ver
Cisco Internetwork Operating System Software
IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(22)EA3, RELEASE SOFTWARE (fc1)
Running Standard Image
24 FastEthernet/IEEE 802.3 interface(s)
Model number: WS-C2950-24
please, reply for my question

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