Using 802.1X and non-Cisco IP Phones

Hi there,
Having some questions about an 802.1x/non-Cisco ip phone setup and was hoping to find some answers/user-experience with this setup.
Main questions i'm facing:
1) When using non-Cisco ip phones (eg Nortel or Siemens) and a previous authorized client connected behind this ip phone gets disconnected. What will this action do with the authorized state of 802.1X on the switch port? WIll it stay authorized until the reauth timer expires or does it reject communication from any other device?
2) What about EAPOL-Logoff messages from the ip phone to the switch. Are these only used by Cisco phones when they experience a link-status change on data ports?
Thanks for sharing your thoughts

Overall, you need to try and deal with the fact that a machine can disappear from the network and the network may not know about it directly (i.e. Link doesn't go down).
I have no idea what other phones do, but Cisco phones send an EAPOL-Logoff when something is unplugged. This lets the switch know directly, and 1X session start is torn down immediately, closing what would be a security hole.
Fundamentally, re-auth is a workaround only, and this is not the reason to enable re-auth to begin with.
If your phone doesn't send an EAPOL-Logoff in this case, the switch might be left thinking an attack is underway when someone else tries to plug in (with presumably a different MAC). You do NOT want this to occur.
Hope this helps,

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