Cisco VSS dual-active fast-hello not supported

Hi,
I have Cisco WS-C4510R+E with sup WS-X45-SUP7-E. IOS version on this switch is cat4500e-universal.SPA.03.04.05.SG.151-2.SG5.bin . Enterprises license is permanently installed on switch. I have configured VSS on this but i am not able to configure dual-active fast-hello on L2 link. only dual-active detection using PagP is supported. since we don't have neighboring devices support PagP. I want to use dual-active fast-hello using L2 links between two VSS switches.
I believe dual-active fast-hello on L2 link is supported on Release 3.6.1E. Please confirm whether i will have to change current IOS release from 3.4.5SG to Release 3.6.1E to support dual-active fast-hello link.
I also want to know what will be major features change if I upgrade current IOS release from 3.4.5SG to Release 3.6.1E
Regards

Hi,
dual-active fast-hello is supported from release 3.5.0
(reference link: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/release/note/OL_29985-01.html )
so is also supported in release 3.6.1 .
You can see all feature changes in release notes for version 3.6.X
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/release/note/OL_32143-01.html#pgfId-2657932
Best Regards,
Alessandro

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http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/XE3-5-0E/15-21E/configuration/guide/config/vss.html#87652
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FEX dual-active detection enabled: Yes
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Te1/5/2 - Interface Up. state: bound
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FEX FEX FEX FEX
Number Description State Model Serial
101 FEX0101 online C6800IA-48FPD FOC1740Y33Y
102 FEX0102 online C6800IA-48FPD FOC1741S58T

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Does the PAgP mode working with Nortel as access switches.
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It is -very- easy to configure.
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no switchport
no ip address
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end
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Fast-hello dual-active detection enabled: Yes
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Port Local State Peer Port Remote State
Gi1/4/14 Link up Gi2/4/14 Link up

Cisco VSS dual-active fast-hello not supported

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